Datsun engined Imp. What was that?!!....

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yoeddynz
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Car Model: 1965 Hillman Imp with a Datsun A12 powerhouse.

Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors!

Post by yoeddynz » Sun May 27, 2018 11:44 pm

Cheers for that oli. From what I've read the viva setup uses the stock discs from a 1159cc hb or 1256hc viva (not the larger items from a slant engined viva)

If so then that's what I currently have on my hb wagon so I'll measure the viva discs and caliper piston size then compare it to the Honda civic items this imp has (vented discs too...for those long alpine descents...)

I was just looking into ordering two new imp 5/8 mcs and put together a bias setup.
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Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors

Post by impmann » Wed May 30, 2018 3:45 pm

Many moons ago, I was investigating running a twin circuit system on the Imp using the master cylinder from a Renault 5. My reasoning... I saw one on the counter of the local motor factors and it wasn't much bigger physically than an Imp one, which meant I thought it could be persuaded to fit under the tank. The fixings looked *close* in size to where an Imp cylinder mounts to that plate and I reasoned that the connecting rod could be persuaded to operate against the Renault's cylinder - although some kind of rebate would need machining in the end to accomodate some kind of circlip/fixing.

According to something I've seen today, the bore size is 17.46mm - not sure how that would work in with a disc/drum set up... I'm no expert on these things.

A quick google found a load on eBay and such like... over to the engineers/experts to pull the idea to bits! :wink: :lol:
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Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors

Post by benwick3 » Wed May 30, 2018 7:04 pm

I'm using Lada split m/c in my latest BMW powered Clan but it did need some modification to fit the Imp pedal box. It does fit beneath a standard Clan fuel tank (Imp with modified filler neck).

I've since been told that a non servo m/c from a Ford Escort Mk 3 fits and works well.

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yoeddynz
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Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors

Post by yoeddynz » Wed May 30, 2018 11:54 pm

Pete- I think it might have been a post from you that had put me onto looking into the Lada MC. They are .750" so possibly mean a harder pedal but obviously its worked ok for you. However according to the previous post from Oli it would be too hard.

So here is a typical issue in the car world of what one person likes another might not. Pedal feel. Well I guess I'll just have to try out a few combinations and see what I like :-)

Tim- cheers for heads up on the Renault 5 item. I'll look them up too. Sadly R5 cars were never sold in huge numbers here in NZ so finding cheap parts might be trickier (Ladas were actually sold in quite high numbers here and there are still many being used as daily transport :-)

I've not yet ordered anything. I'd rather just mount a twin circuit mc and see how it goes rather than muck about making a bias setup. However, pedal pressure aside, there is a more important issue of balance and locking front brakes. Has anyone used a proportioning valve in an Imp to reduce pressure to the the front brakes? Or is that just a bandaid fix that doesn't actually work well? Certainly very easy to install one in line!
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Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors

Post by John Simister » Thu May 31, 2018 8:52 am

The problem with a pressure limiter to the front wheels is that it would reduce ultimate braking performance on a dry, grippy road and could even cause the rear wheels to lock as you press the pedal ever harder, causing major instability. A limiter is useful, vital even, on the rear brakes of a nose-heavy front-wheel drive car because the harder you brake, the less of the total braking effort is contributed by the rear brakes and the pressure limiter stops the increasingly lightly-laden rear wheels from locking. But it won't solve the Imp's front-wheel lock-up problem without compromising overall braking ability. That said, it might be worth investigating how Porsche fixed the problem (if indeed they did) on pre-ABS 911s.

So, next stage: ABS?
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Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors

Post by John Simister » Thu May 31, 2018 9:05 am

Perhaps what is needed is a deceleration-sensitive, rather than line-pressure-sensitive, limiting valve, designed in such a way as to reduce its effect with increasing deceleration (counter-intuitive, but think about it) rather than increasing it as such deceleration-sensitive valves normally do. An example of a deceleration-sensitive valve, albeit one which increases its effect with greater deceleration, is fitted to the 1.6-litre version of the Peugeot 205 GTI. It is mounted with its front end slightly upwards, and contains a ball able to roll up a ramp against, I think, a light spring causing hydraulic outlets to be progressively blocked. I'm not sure precisely how it works. The mounting inclination is critical to achieving the correct rate of pressure reduction.
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yoeddynz
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Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors

Post by yoeddynz » Thu May 31, 2018 8:28 pm

^of which setting up such a device is probably beyond a bloke in a shed. I never realised that the pugs had such a thing (such great wee cars..my brother had a 1.9 =fun times)

Yes- I have looked deeper into pressure regulator valves on front brakes and the general consensus is .... NO! Dont do it! :) however all the guff available out there that I have read so far has been for front engined cars. Maybe I should pop over to a vw beetle or 911 forum. But probably better to stay here and just absorb everyones experience.

I think I'll just have to build the car and give it a whirl. I know one thing..I really don't want a single circuit only. It scares me to think of something failing, a flexi hose bursting etc. Especially with some of the drops around here. In fact just up the road from us, all of maybe 3km away, there is a car on its roof about 30m down a cliff. Not brake failure in this one but it gets me thinking. I'd rather have a back up of at least 50 % brakes. This way I can at least do a neat pirouette off the cliff as one end locks up :-)

https://www.stuff.co.nz/national/103382 ... liff-crash
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yoeddynz
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Re: Yoeddynzs 1965 Datsun enginned Imp. Yay for solid floors

Post by yoeddynz » Sat Jun 09, 2018 8:54 pm

This turned up last night :-)

Watched over by Kevin the cat...

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I'll post up more once its cleaned.
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Re: 1965 Datsun engined Imp...and then there was three.

Post by 617sqn » Sat Jun 09, 2018 9:20 pm

Kevin looks to be a big boy ! :o

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yoeddynz
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Re: 1965 Datsun engined Imp...and then there was three.

Post by yoeddynz » Sat Jun 09, 2018 11:44 pm

He's all fur...
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Re: 1965 Datsun engined Imp...and then there was three.

Post by yoeddynz » Tue Jun 12, 2018 10:17 am

So where was I ? Well some might remember ages ago, a long, long time ago when I still had a V6 Viva,that mentioned I was going to sell it and if so I wouldn't mind an Imp project.

Well last August hannah and I had gone to the Oldschool Hanmer get together and after the meet we went along to a large collection of classic cars an old boy had been collecting until he died. It was there that I had spotted this wee fella...

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After lots of in-decisions, plus getting another two Imps since then, this one ended up on the back of a trailer on Saturday morning and did a little trip north...

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Thanks very much to those involved in making this happen. Thanks to Will for collecting it from the yard, along with many other Imp bits (hopefully he might well yet get into an Imp project one day and when this one is finished he'll get a drive so hopefully he'll see what the fuss is about)

Also big thanks to Greg for bringing the Imp up for me. Props to Bart, I think, who spotted one of the strops had broken and saved a potentially nasty incident.

So it arrived and I sat inside it, beer warming my belly and pondered what new mess I had acquired...

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Before the guys went on their way back south, Datsun in tow, they helped me push the Imp up to the Imp 'Lichen removal' area...

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So it sat as I mixed up some warm water and car shampoo...

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As I cleaned it up an old rego label appeared dated 1985-1986...

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It looked a fair bit better with all the Lichen removed. Although no all the rust was better evident :( ....

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The inside (great head lining which was one of the reasons I wanted it) was filled with extra interior bits and even included a rats nest too. How lucky.

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I quite like the dated 'Jazzergetics-fitness the fun way' sticker....

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I moved the car inside and started the empty out. Good score on a red and black set of seats and door cards. Great condition. It looks like someone had previously removed the door cards, made new hardboard backs and were obviously intending to fit them into either this Imp or another. I'm happy that they'll get used :-) I think they'll look really good against the black mx5 front seats I have bought for the car.

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Another good score was this fine example of a '90s kettle...

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So that evening the Imp sat, all clean and dry, probably wondering what was to become of itself..

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I was wondering too. I thought it would be a wise idea to pop it up on the hoist and see what it was like underneath. Turns out its really solid from the front to the back until you get to the rear arches. The outer sills are shot but the inner sills, floor area are great. In fact the outer sills are still intact along the very bottom but would still need replacing. The floors are solid! No rust. The front end is really good too. The worst rust is the entire rear end, from the bottom up to the swage line. The rear seat area is solid but the parcel shelf is even worse than the other one. I have learned from that and if I was to do anything with this shell that will be cut right out first.

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So there we have it. Another potential shell to be rescued but for now it will be plundered for anything that I might need to complete the other one. Apart from the pedal box having been nicked by someone its complete. I have already removed the following for IMP ONE..

The gearstick and choke lever/cable. The throttle pedal and cable. The hand brake and cables. I'll be taking the headlining at some point, the dash, heater, gauges, wiring, lights. So it'll end up as a stripped out rolling shell.

I think between the solid rear end and sills of the race car and the really good front end of this a good shell could be made. But I'll wait until I see what Imp one is like to drive before I make any more decisions on what might happen with this one. i might just stash it away in a friends shed for the future. Or maybe flick everything remaining off for someone else to take on as a project. I shall ponder this in the future. Nothing wrong with having a spare Imp up your sleeve :)

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alex
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yoeddynz
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Re: 1965 Datsun engined Imp...and then there was three.

Post by yoeddynz » Wed Jun 13, 2018 9:17 pm

617sqn wrote:Kevin looks to be a big boy ! :o

Andy G
He does indeed look quite big here...

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But back to cars. This new Imp. Hmmm. Its too good to scrap and I am hankering to do another Imp project in the future. However plans/motivation always change. Hwever- in order to make sure that the really solid floor and inner sills etc dont get any proper rust I decided to remove all the heater pipes and loom, clean out the dirt and dry out any damp from the pipe removal process (they still had water in them). I'll spray some wd40 in the crevices along under the nice solid inner sills to halt moisture and so I can sleep easy at night knowing that my investment in for a future project has a chance.

This done I looked at that rusty shelf. it had to go. But there as an engine in the way. So last night this happened...

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Getting quite good at chopping up Imps.

I separated the engine and box. Box feels to be in great condition, smooth, no slack. I now have five Imp transmissions. So I
need more Imps?

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Engine feels seized. Spark plug removal attempt broke plug off in hole.

Removed cam cover to have a peek. Very clean and tidy in there. Shame. Cute little cam...

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Engine will probably get weighed in. Cant imagine a mk1 engine with the weaker curly edged block is worth anything when seized.

Now I must stop procrastinating and crack on with IMP two shell.
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Re: 1965 Datsun engined Imp...and then there was three.

Post by ImpManiac » Sat Jul 28, 2018 11:50 am

Lovely work on the floor repairs, Alex. And the Imp shell and parts stash is coming along well! :wink:

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Re: 1965 Datsun engined Imp...and then there was three.

Post by bazzateer » Sun Jul 29, 2018 10:51 am

:mrgreen: Garage envy :mrgreen:
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Re: 1965 Datsun engined Imp...and then there was three.

Post by colimp66 » Sun Jul 29, 2018 12:04 pm

bazzateer wrote::mrgreen: Garage envy :mrgreen:
Too right there Baz, Im in a single garage and it would be great to have more space. Need to work on that.

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Re: 1965 Datsun engined Imp...and then there was three.

Post by oli » Sun Jul 29, 2018 4:52 pm

You may want to hang on to the early distributor, as I understand that they have an advance that is close to a Sport dizzy. (Can't remember where I read that now, so feel free to refute or confirm).

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Re: 1965 Datsun engined Imp...and then there was three.

Post by yoeddynz » Thu Aug 02, 2018 8:53 pm

Cheers for heads up. However - I'm not planning on using an imp engine ever but happy to pass the dizzy on to anyone local who wants it (although I suspect most kiwis into imps wouldn't need one as most imps here seem to be mk1s)
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Re: 1965 Datsun engined Imp...and then there was three.

Post by yoeddynz » Tue Sep 18, 2018 9:17 pm

Wow! Its been a while since I've updated this thread. Work on this wee car pretty much ground to a halt after the last update. I got busy with other peoples cars for work and then took off to the UK for a holiday. 4 weeks of sunshine and loads of cycling. Nothing to do with cars at all. The one car that I spotted whilst there and liked was this absolute gem...

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Drool.

Anyway. Got back to NZ and spent the next few weeks dealing to property jobs and more customer jobs. Finally last week I pulled the Imp out from its spot and finished off the panel work in the back.

Now there's something we have to go back in time to jog memories. Normally in order to jump time I would just jump into my trusty police phone box like here in the Viva thread....

http://forum.retro-rides.org/thread/932 ... ld?page=49

But I have had ongoing issues with that mode of transport. Things like oil leaks from aged seals and fading paint to name a few. So I sold it on at the end of summer to some fella called William who I met at the local market. Strange bloke. Not seen him since. With that machine gone I realised I had a desire to build another. Maybe a Delorian? Nup- prices had gone up beyond what I could afford at the time... so I based my new creation on one of Britains finest machines made. So now folks I shall introduce you to the Princlorian...

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With my new creation I was able to travel back in time to show you all a period in my Imp resto that I regret wasting time on. So in the beige wonder we shall travel through Hillman Imp time....


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Whoops. That's too far. Hang on, try again...

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Oh dear. Must be the electrics. The fella at the motorist discount centre told me it was a 'new old stock' Lucas flux capacitor! Try again....

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Ennnnggggrrrrrr!!!! I flicked the wrong rocker switch. Sorry. Hang on..

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Righto this is annoying. But I think I've worked it out. Here we go...

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FINALLY!!!! Right. So way back when I first got the replacement shell I spent a long long time doing this...

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To this...

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I now wish I didn't. Instead I should have just chopped it out. Which is what I did in the end and had mentioned it in one of my last posts. Well with it all gone my next job was to rebuild it all. This is what I did last week.

Imp back in its work spot with customers cars waiting...

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Working on building up ones shelf.... (terrible)

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To suit the fiberglass engine cover that came with the race car..

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Fill in the blanks..

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With that finished I rebuilt the rotten gutter above the bay..

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Hannah has painted the lot in epoxy primer and I started on the front end which had been bent at some point when the shell was moved- probably a lifting strop or something I guess. I was originally thinking I'd have to cut it out and let in a straight front panel but actually after about an hour with lengths of wood, a jack, hammers of various sizes and many different shaped bits of steel Hannah and I managed to straighten it out fine. Very happy with result.

Before...

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After...

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Now I need to remove the rot from the front of the bonnet. I carefully hammered out a small dent.

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Hannah laughed. It could have ended up like this scene...



Then I can modify the front end to take the radiator. I must crack on because summer is coming quickly and there's so many other jobs we want to do here ! Planning on selling the housetruck this summer and building a new house trailer so that is one huge amount of time that I'll need to find. Please keep tempting me with racy little Imp photos.

Alex
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yoeddynz
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Re: 1965 Datsun engined Imp. Lets go time travelling...

Post by yoeddynz » Sun Nov 04, 2018 7:57 am

Phew. Well that bonnet took a while. In between other jobs I whittled away at the rot on the bonnet. Some awkward shapes going on at the front. I did my best, without getting too carried away, at rebuilding the shape correctly in steel. It will have filler on top however I wanted to avoid having to use filler to get gaps between the bonnet and the car correct. I don't really like the idea of filler on edges that can get knocked.

Not really a lot to explain in the process of rot removal on this. I think the photos do a better job. You'll see I started the main repair by fabricating a new front edge and welding it in stages so checking it lined up with the body and the gap remained correct. It was so rotten that I sort of guessed the gap just tried to make it look 'correct'...

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The front repairs puled up in welding slightly- enough that I wasnt happy with gap. Had to slice open and stretch it bac down. Lucky an easy rscue..

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Then onto the underside repairs..

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That's probably enough photos of a bonnet for you all.

Next job is to modify the front panel and inside the frunk to accept a radiator.
Last edited by yoeddynz on Sun Nov 04, 2018 6:23 pm, edited 1 time in total.
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Re: 1965 Datsun engined Imp. Lets go time travelling...

Post by tiker » Sun Nov 04, 2018 9:27 am

Looks like you got the profile spot on I'll have to unpick mine and redo it.
Is the other one just the same, looks like you have 2shells ? Bit of a coincidence were doing the same bit at the same time keep going soon be driving :-)
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Re: 1965 Datsun engined Imp. Lets go time travelling...

Post by yoeddynz » Sun Nov 04, 2018 6:19 pm

Yeah looking forward to getting it done! Summer is arriving and I dont want to miss out.
But I shall have to be realistic...

I for got to add two photos showing the main bonnet repairs and where I had to slice it and bend the second bit I had let in downwards because in welding it had pulled up. I'll add them in.

The other bonnet I have is way more rusty. I'm planning to sell the other two rolling cars on to help fund this one so I just picked the best bonnet to use :-)
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Re: 1965 Datsun engined Imp. Lets go time travelling...

Post by yoeddynz » Thu Nov 08, 2018 8:43 am

Front radiator time. The race car came with a radiator mounted in the front. Not sure what its from, I think the previous owner said it might be Toyota starlet. Anyway- it was loosely mounted and not sealed at all. I want to fit it into this shell neatly and so it has the very best chance at pulling off heat as well as possible.

I cut the horn box out. Easier than I was expecting luckily.

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I made the hole bigger...

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Radiator plonked in place...

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I'll fabricate a box for it to fit to. Then add back in some strength now lacking from not having that box there- to support the mounting area for the front suspension wishbone pivot brackets. I'm also hoping that by the time all the rad cowling/shrouds are fitted it'll all be nice and strong around there. I'll have to try my best to impart some element of crumple zones within the structure but hey- I'd rather just not crash.

Looking from the front to the left, I'll make another partitioned off box to gather air for the ventilation. The large vent pipe will have to locate further up the side or on top of that second box because it will effectively be moved left towards the chassis rail and drivers headlight area. I'll then cut a big hole in the spare wheel well and fabricate a shroud to guide the hot air out and under the car. I realise that some other Imp owners have vented the hot air out upwards and forwards into the low pressure zone in front of the bonnet gap. I really dont want a open gap. I'll go for down and under the car.

I have a fan. Its good grunty wee fan off the old aircon setup we ripped out of a customers Toyota Hiace. I kept it when I spotted it was almost a perfect fit for the little radiator. Orginally I was planning to mount it right on the back of the rad...

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But then the non- fan covered areas would require a shroud so to keep fan effective. I didn't want to shroud this rad so closely and create a buffer that would hinder airflow through the rad. I then thought about mounting it facing down over the outlet hole and shrouding it there. Not sure on how this will still potentially create a resistance though by making the outlet hole effectively smaller...

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I had to do some thinking. I had a cup of tea and pondered the layout...

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Fitted the tank in place to double check on room and theres plenty of space. Spare wheel will have to go on top of the tank.

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I shall scheme ideas the fan situation overnight. I have an idea already but it its a bit more involved. Any ideas or photos of how folk have done there layouts on here most welcome.
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by Cliff Pountney » Thu Nov 08, 2018 4:21 pm

My day job is designing cooling systems for Ford so I may be able to help you a bit :P

Here's a few design tips -
1) Try and get at least 20mm between the front of the fan blade and hub and the radiator rear face. However you don't generally see any improvement by going more than 30mm (for car / light truck size fans).
2) The fan shroud should seal or fit closely to the radiator if you need good low speed cooling. At low speeds you are creating a slight vacuum behind the radiator and any air you pull in which has not gone through the radiator is robbing radiator airflow. Obviously it must not rub or vibrate against the radiator tubes.
3) You need to think about how the air escapes from the back of the shroud. You don't need a huge amount of space behind the shroud (take a look at any car designed in the last few years) but you do need a path. We did some work with Bosch and reckoned that 50mm is about the sweet spot. Greater than 50mm didn't really see any improvement but it does rather depend on how 'air friendly' the shape the air hits is.
4) For something like an Imp your going to need most of your cooling at moderate or high speeds. At higher speeds the fan becomes a restriction and manufacturers add speed flaps so when the fan becomes a restriction the air can bypass it. Take a look at a modern fan shroud on a car with AC and you'll most likely see rectangular openings in the shroud with hinged flaps.

Point #1 and #3 apply to all installations. Points #2 is less relevant if you don't need much low speed cooling (ie you don't tow and don't have AC). Point #4 is only relevant if you have a sealed shroud (which you would have to have if you located your fan as you show it horizontally at the bottom).

I went through the same though process as you and I decided to use a fan without a shroud and position it close to the radiator. You then want some well sealed ducting to join the radiator through to a low pressure zone (cut out the spare wheel well, or big hood vents) as most of the time it is the air pressure difference (the ram air) between the front of the vehicle and where you exit the air to which drives your radiator air flow.

I would be skeptical about the fan in the lower horizontal position. It might well work but I would have higher confidence in locating it directly behind the radiator.

Cliff
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by yoeddynz » Thu Nov 08, 2018 6:17 pm

Ha awesome! :-) thanks for this advice! You being a cooling expert is handy. What's funny too is that I have a project thread up on retro rides forum for this imp and I generally copy and paste the same updates up on each forum, changed to suit ie no point explaining about specific imp things on here as you will all know them already.
So I loved on to retro rides this morning to check for replies and I had a very useful reply on there too.. From no less then a fella who also worked in designing /testing cooling systems for oem manufacturers! :-)

How lucky am I!

Here's a link for your interest...

http://forum.retro-rides.org/thread/202 ... st-2460261

Cheers!
Alex
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by colimp66 » Thu Nov 08, 2018 9:56 pm

This is what i did with my front radiator conversion.
viewtopic.php?f=33&t=12416&start=680

It ducted through the floor like yours too.

Cheers
Col.
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by Cliff Pountney » Fri Nov 09, 2018 1:52 pm

There's a lot of us in automotive cooling. At some public road test locations, like the Gross Glockner in Austria, you can scarcely get to the bar for all the thirsty cooling engineers :D

All the points he made are spot on. Create a high pressure zone ahead of the pack, a low pressure zone behind it and seal it up as well as you can.

Cliff
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by yoeddynz » Fri Nov 09, 2018 7:16 pm

Cheers Col and Cliff.
I can remember reading that part of your thread Col and finding it all very interesting - especially the wall of technical text from Moose.

I have a design nutted out taking advice from all. I'm just folding steel and cracking on with it now. The front end reinforcement started already with a nice lump of RHS going between the chassis legs - that front suspension pivot point aint gonna flex :-)
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by yoeddynz » Sun Nov 25, 2018 9:24 am

In between working on a very sweet little Chevette with a Mazda 12A I have I have been whittling away on the Imp radiator placement, fan mounting and shrouding.

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What started off as simple ideas turned into more complex shapes as I wanted to make it all easy to take apart for servicing, plus super strong. Its now very beefy up front and those mount points aint gonna move a bit. The radiator mounts, fan mount and exit point and shroud have so many folded over edges that its all really nice and stiff.

To start with I lobbed a hefty chunk of RHS connecting the front rails and welded to the front suspension bracket points...

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Then I did some CAD work and started building up a radiator support panel..

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This was made so much easier by our new tool- a guillotine we bought and picked up from my Uncle when we got our new lathe from him. I will never miss making long cuts with a cutting disc and all the associated dust mask, googles, ear protectors etc. Its made in England by Pictorex, is originally for paper but good enough to do 1.2mm steel so ideal for most car work..

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Once the radiator mount was made I had to sort out where the ventilation system was going to get it air from. I had cut the hole in the front large enough to allow for an extra pick up. I built a tapered box behind it and angled it take the original hose ducting, making sure it was ot going to foul either the headlight or the fan shroud later on...

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I went to the local radiator place for a bleed nipple and drain tap that I was going to solder in myself. He said he could fit them while I was shopping and so he did, cleaning and pressure testing it too, all for only 15 quid! Awesome. I'll go back there once I worked out pipe placement. I had cut a hole in the support panel so I can drain the coolant out the front..

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Then onto into the fan and shroud. I wanted it to flow air through well when the fan was not on so made side supports with holes and little stainless hinge bars...

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These were welded to the fan frame like so...

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Mounted in place with alloy flaps hung on those bars.

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I tested them by blocking the radiator intake with a well fitting piece of hardboard and firing up the fan in reverse...

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Works really well. Happy with that. So I started framing the outlet hole. I added a new Lada Niva tandem master cylinder in position so to make sure I would build around it to suit. The M/C was given to me by good 'ol @NickJ ( I owes ya!) and he gave me the newspaper that the box came wrapped in which had these two likely looking Russian characters on it...

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Framing the hole..

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Then I had a point to mount the shroud to. I welded the shroud on the inside of the joins so it cleaned up nicely. I made it as swoopy/smooth flowing as possible to make the air flow out cleanly (again... most likely getting a bit carried away a bit.. but its is fun this ). It can be removed easily, two screws, without moving the tank and then the fan with its shroud can come out, two screws. Then the radiator.

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So to finish this lot I need to swap the top inlet position on the radiator to the other side and add a baffle on the opposite side. Given how cheap and friendly that 'Rad' fella was I'll go back there... I reckon if I touch it with my current unsuitable gas torch I'll probably end up melting all the solder away from everything! With that done I can add the channel I am planning to run the pipes under the car but out of harms way. Then I'll make some seat mounting points for the MX5 seats now spare from the Viva.
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by Dave ' Linwood ' Lane » Sun Nov 25, 2018 9:33 am

looking superb :D
Formally known as " Noddy "
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by moose » Sun Nov 25, 2018 2:38 pm

https://nasaspeed.news/tech/engine/rock ... rinciples/

I took my fan off the face of the rad and put two small fans horizontal in the duct in a shroud to that when they are on they pull air from every fin, more air over more fins = better cooling. The improvement was huge, the car ran at 75 deg on rally with the fan running (it is a totally sealed ducted air in and out set up) now with the fans in a shroud in the duct I can cool it down to 55 deg with the fan on even at rally speed. 110 + BHP engine.
Regards Moose
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by yoeddynz » Sun Nov 25, 2018 6:49 pm

Sweet- yeah I think you have linked that article before and its a good one.

With the fan running on this (at low voltage too as my spare battery is getting low) the draw through feels great. You can put your hand anywhere on the face of the radiator and feel decent suck. With the shroud in place the amount of blow out through the bottom is impressive. Really happy with it :)
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by Bobbycham » Sun Nov 25, 2018 7:12 pm

Don't you just love it when a plan comes together in the build ?
Sounds really promising .

Bob Imp005
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by moose » Sun Nov 25, 2018 7:24 pm

whole project is looking superb. Have a think about how you are going to keep the fuel tank cool, you dont want pre warmed petrol.
Regards Moose
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by Cliff Pountney » Sun Nov 25, 2018 8:56 pm

That's a cracking fan shroud you've designed there. Looks better than many of the designs I have seen from fan suppliers. You might want to add a little rubber or something to stop the speed flaps rattling.
I like the way you have considered servicing with the drain cock and the exit duct.
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by yoeddynz » Sun Nov 25, 2018 10:29 pm

Yeah moose- I was thinking about the heat radiating. I could either slap some insulation over the top of the shroud or a second skin heat shield.

Thanks cliff. Yep some thin self adhesive foam would do the trick if they seem noisy.

I suspect I'll be ending up with a nice rowdy exhaust on the Datsun engine so possibly won't hear much else..... :D
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Re: 1965 Datsun engined Imp. Front radiator fitment time..

Post by yoeddynz » Wed Dec 05, 2018 6:15 am

I moved the shell onto the hoist and removed the last bits of rot, tiny bits around the front arch..

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Work then continued on the cooling circuit. The race car was like this...

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Fine for a race car but way too hot and in the way for a road car. I have had the intention of fabricating a separate tunnel to house the pipes ever since getting the race car. This is because if I was to run the pipes inside no matter what I try and do to insulate them there will be a fair bit of heat escaping into the cabin, plus they'll take up more room. With a tunnel the heat can instead radiate out into the airflow there should be very little transfer into the cabin. They'll take up less room and with a simple false floor above the tunnel in the front the passenger should not even know....

Plus any leaks go to the ground, the pipes can be easily attended to and the well.. it just seems a neat way to do it :-)

So I started by chopping down the removable cover so I can weld it back in for a neater stiffer area.

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Then I marked out some lines and started cutting away...

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Then I cut and folded some tunnel sections up and welded them in. I have tried to keep the curves as gentle as possible without encroaching too far into the footwell. I had to make sure the pipes would be clear of the front suspension arc.

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Meanwhille Hannah kept busy stripping useful parts out of the racecar shell...

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I cut more bits out, formed more tunnel sections and ended up with a lovely clear tunnel front to back...

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I now need to fit the rear seat in and see how I can avoid passengers getting a hot bum. I'm not sure how close it sits to the metal base. I might just have to wrap the pipes and make some heat shields as i can box it lower due to the rear swing arm mounting point box section. Then its seat mounting time. Then paint prep. That will be where things start to get very, very, very tricky!

What colour? I have my mind on a on a few different light blues and even some light greens. Decisions... :-)
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Re: 1965 Datsun engined Imp. Tunneling for pipes...

Post by moose » Wed Dec 05, 2018 6:30 am

http://www.textiletechnologies.co.uk/su ... e-red.html

I used this to keep the heat out of the interior on the rally car, added bonus is the colour as for UK rallies all water pipes running inside the car have to be red !
Regards Moose
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Re: 1965 Datsun engined Imp. Tunneling for pipes...

Post by yoeddynz » Wed Dec 05, 2018 7:18 am

Good idea!!! There will be a similar product available here in nz in sure. I only need a metre for the bits under the rear seat.
I'm a member of our local fire station.. Maybe I can pinch something from the firetruck..... :-)
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Re: 1965 Datsun engined Imp. Tunneling for pipes...

Post by tiker » Wed Dec 05, 2018 10:00 am

Top fabrication there what more can I say !!
Gary
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Re: 1965 Datsun engined Imp. Tunneling for pipes...

Post by bks974c » Wed Dec 05, 2018 10:36 am

Very neatly done, Top Job.

Scott
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