The stanced '67 Imp Super - SOLID DRIVESHAFTS

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Re: WBH 985E '67 Imp Super

Post by 19James » Wed Jul 09, 2014 9:57 am

Hi everyone
A few things have changed on the Imp in the last 2-3 months, as mentioned it has another L4 875 that seems to be a brilliant little engine, it looks as though it's been rebuilt before as we could still see the honing marks and the fact the pistons came up so high giving high compression.
When I first fitted it i couldn't seem to trace a misfire that was always apparent over 4000RPM, this turned out to be the dizzy which was a bog standard 45D. We ditched that for an Accuspark fast road 45D dizzy as that was what we had at the time and it's brilliant, just wants to keep revving and it starts first time every time.

I've also had trouble with water pumps in the last couple of weeks. The first one fitted was out of the same car the engine came from and it had been sat for a good number of years, I suppose I was quite lucky to get 3 months of driving out of it really, I replaced that for another unknown water pump and that seemed good for a day or two but started leaking quite badly. So last sunday we picked up a recon pump from Ben Boult and following his instruction of running it on plain water for the first day to run the seals in it has been fine, not a drop of water leaking.
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Also tidied the engine bay up a bit.
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Still far from being tidy but a bit more presentable.
I'm about to go and fill it with antifreeze and take it for a run, I'll report back with running temps.
Cheers, James Imp004 Imp005
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Re: WBH 985E '67 Imp Super

Post by ImpManiac » Wed Jul 09, 2014 11:00 pm

Sounds good, James. :D

IM 8)
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Re: WBH 985E '67 Imp Super

Post by 19James » Fri Jul 18, 2014 3:56 pm

Hi everyone
Been fiddling and tinkering as usual and sorting out any little problems.
I fitted a little voltmeter that was about £2 off eBay just to give an idea of battery voltage and charging.
One thing that has always not been right is the fact that it would all of a sudden jump to 17.2v, the car would become a bit slow and the all the lights would brighten. It also killed a battery by luckily they replaced it for me.
I have now fitted the alternator from the trials Imp to it and it now sits at a solid 14.2v.
I will either get the old one rebuilt or replace it as the trials car is now out of action.

I'm off to see Dick Tompkins on Sunday as he's got some early indicator/sidelights for me as I prefer them to the slim ones, should make the car look a bit more period.

I said I'd report back running temps and so on so here goes.
Water temp: 70'C which raises to 85'C or just over with abuse.
Oil pressure: 45-50psi which lowers to around 20 after a motorway drive.
Battery voltage: 14.2v
I guess it's nice to compare these measurements with other Imps.
Cheers, James Imp004 Imp005
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Re: WBH 985E '67 Imp Super

Post by 19James » Mon Aug 04, 2014 9:20 pm

Hi everyone
I really enjoyed my first national in my own car, it was brilliant and I had some nice comments about the car.
For those who haven't seen it it's now on a set of Mag GT 12x6 wheels that look right on it as they're a period 60's alloy.
On the Thursday at national I noticed I had a big tear in the drivers side BMW donut, so I carefully drove it to Peterborough and bought a new one from GSF car parts. I soon realised why it had failed after I removed it, there is no correct part numbers on it at all, it also feels completely different to the genuine ones.
The car used little oil and no coolant so I'm happy about that.
I fitted the bucket seat and harness that was in the car while it was being raced in the 80's and I love it, it's amazing how much I can feel what the cars doing now.
Tomorrow I'll be sorting a plastic rear window for it to stop it leaking and vibrating at high speed, should also save a bit of weight too :D
Cheers, James Imp004 Imp005
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Re: WBH 985E '67 Imp Super

Post by bazzateer » Tue Aug 05, 2014 8:22 am

Good to see you there James. Keep up the good work with both your Imps.

Congratulations on your award, richly deserved! :D
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Re: WBH 985E '67 Imp Super

Post by ImpManiac » Tue Aug 05, 2014 3:58 pm

bazzateer wrote:Good to see you there James. Keep up the good work with both your Imps.

Congratulations on your award, richly deserved! :D
This ^^. :D Well done!

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Re: WBH 985E '67 Imp Super

Post by Lars Hagermark » Tue Aug 05, 2014 7:13 pm

Sorry I couldn't be there. Nevertheless - Congratulations James!
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Re: WBH 985E '67 Imp Super

Post by 19James » Fri Aug 08, 2014 9:33 pm

Cheers guys! It was a bit of a shock I wasn't expecting it at all so thankyou for that, the trials Imp will be getting some more abuse soon.
Done a few little things on the Imp. I was fed up with the back window leaking and vibrating like mad so me and dad cut out a suitable piece of Lexan and fitted that, it's now quite a bit quieter and the weight difference is almost noticeable.
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I have also refitted the bucket seat and harness that was in there from when it was being raced in the 80's, I find the seat very comfortable and it holds me in nicely.
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Got a few decent pictures aswell the other day.
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Cheers, James Imp004 Imp005
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Re: WBH 985E '67 Imp Super

Post by 19James » Sat Jan 31, 2015 11:18 am

Hi everyone
Long time without an update.
The Imp has been relentlessly taking me to and from college daily.
Retro rides gathering was brilliant last year, as was national.
I have bought a Vw Lupo to start driving daily in March, Then the Imp will come off the road for a few jobs hopefully ready again for national and retro rides gathering, all depends on insurance.
Here's a couple teasers for you 8)
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Image
Cheers, James Imp004
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Re: WBH 985E '67 Imp Super

Post by 19James » Sun Apr 05, 2015 4:03 pm

Hi everyone
The Imp's insurance ran out a few weeks ago so I have been commuting to my apprenticeship with a historic race team in the Vw Lupo.
The body is partway through being tidied up and looks smart, the 13x8's fit nicely and I have some dampers lined up that will allow the required ride height 8)
I will sort out some pictures at some point.
Cheers, James
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Re: WBH 985E '67 Imp Super

Post by 19James » Thu Jul 30, 2015 7:29 pm

See you all at national in a week 8)
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Re: WBH 985E '67 Imp Super

Post by The Nun » Thu Jul 30, 2015 8:31 pm

Another one with air ride suspension?
Or can you prog your sst nav to avoid sleeping policemen?
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Re: WBH 985E '67 Imp Super

Post by 19James » Fri Jul 31, 2015 5:53 am

The Nun wrote:Another one with air ride suspension?
Or can you prog your sst nav to avoid sleeping policemen?
No "on the move" ride height changability here
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Re: WBH 985E '67 Imp Super - national!

Post by 19James » Wed Aug 05, 2015 9:36 am

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Pretty much ready for national now I think, just got to pack the car. Dad will be in his stiletto, about 180 miles for us so hopefully we'll have no problems.
See you all there!
Cheers, James Imp004
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Re: WBH 985E '67 Imp Super - national!

Post by ImpManiac » Wed Aug 05, 2015 9:53 am

Have a great time, James and Mark! 8)

I like your photos, by the way. :wink:

IM 8)
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Re: WBH 985E '67 Imp Super - national!

Post by 19James » Wed Aug 05, 2015 1:11 pm

Cheers Paul, all credit to my sister!
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Re: WBH 985E '67 Imp Super - national!

Post by Lars Hagermark » Wed Aug 05, 2015 4:09 pm

Have a great National both and all. :D
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Re: The stanced '67 Imp Super - post national

Post by 19James » Wed Aug 12, 2015 2:41 pm

Hi everyone
A quick thankyou to the organisers for another brilliant national!
Well done to both Andy Jones and Simon Benoy on their race wins at croft, showed the minis the way home 8)
Simon, Chris and Andy did a very good job of sorting Simon's clutch woes.
Both mine and Dad's Imps have no problems really over the weekend, both used some oil but that's to be expected driving at 65 for 400 miles.
Cheers to Dom and Corey for a really good weekend 8)

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A few jobs need doing before retro rides gathering in less than two weeks, only minor things, who's going?
Cheers, James Imp004
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Re: The stanced '67 Imp Super - post national

Post by gnatman » Fri Aug 14, 2015 11:14 pm

I'm attending RRG again this year but I'll be in my Renault sportvan
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by 19James » Wed Jan 27, 2016 8:27 pm

Hi everyone
The Imp has had a few additions lately.
First of which was a pair of fiesta brake discs and calipers on the front, this meant fitting a pair of 13x7 Revolutions to give a bit more arch clearance. This also allowed me to reduce the camber a little, I still want to further reduce it though.
The revolutions I refurbed myself, I've had mixed opinions on the mismatched wheel setup but I quite like it.

I also finished a project I've been working on for a couple of months now. When I got the trials imp it came with a pair of weird driveshafts fitted that I thought were of no use to me, I kept them anyway and I'm glad I did.
They've had Hardy spicer Mini shafts welded on just after the UJ, this shaft has a spline to fit Spicer UJ's, of which I managed to source a pair. So all I needed was an adaptor to bolt the Spicer UJ to the Imp's diff output spiders.
After a bit of measuring and thinking I did some drawings, bought 2 bits of alloy billet and set about machining them on work's lathe.
I worked out my hole centres and drilled them through on the mill, the four that hold the UJ having counterbores so the bolt heads sit flush, allowing the spicer to mount flat on the adaptor.
This is what I ended up with.

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I've driven it and it's great to drive, no vibrations, no nasty noises and no feeling of anything letting go. This is a massive step forward for me and the car as I won't be replacing driveshaft couplings every month from running the car so low and drifting.
Cheers, James
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by ImpManiac » Wed Jan 27, 2016 10:31 pm

Most interesting, James! 8) It will be great to see how you get on with that setup in your road car. Please keep us posted. :wink:

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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by cov_climax » Wed Jan 27, 2016 11:10 pm

Nice looking job there James,
It'll be interesting to see how it stands up over time.

Just check you have the yokes aligned, it looks like they are not in the picture, this will be pulsing the diff and could lead to faster wear than expected, at which point you'll suspect the lack of donuts.

Is there a sprung clutch plate to help the gearbox cope with shocks?

Have you cut s groove on the spider end and fitted circlips to retain them like a mk.1 box? Or are there springs in the telescopic section to keep them in the 'box?

Brian
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by 19James » Thu Jan 28, 2016 6:35 am

cov_climax wrote:Nice looking job there James,
It'll be interesting to see how it stands up over time.

Just check you have the yokes aligned, it looks like they are not in the picture, this will be pulsing the diff and could lead to faster wear than expected, at which point you'll suspect the lack of donuts.

Is there a sprung clutch plate to help the gearbox cope with shocks?

Have you cut s groove on the spider end and fitted circlips to retain them like a mk.1 box? Or are there springs in the telescopic section to keep them in the 'box?

Brian
I was waiting for someone to mention that, sorted it the other night and it feels okay so far.
The clutch is standard Imp bits, the driveshafts have springs to prevent the spiders pulling out. I made the adaptors at such a thickness so as to only allow about 10mm of travel, so you can only just slide the adaptor off the spider, this way there's much less chance of losing oil.
Cheers, James
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by moose » Thu Jan 28, 2016 7:58 am

some nice engineering going on there, i had an idea whilst looking at this and will throw it out there for you to consider, if you could incorporate a rubber coupling between the alluminium adapter it would cushion any shock load to the box and would be kept running in a vertical plain, you would get some wind up with the torque from the engine fitting the grip from the tyres but it would not be fighting this whilst being at a severe angle due to the low stance of your car the two UJ's take care of that. When i have inspected the comp donuts on the rally car in the past i have found witness marks on the 3 edges of the driveshaft and the out put shafts i radiused them many years ago but at that time i had three goes at increasing the radius to prvent the rubbing. if you build up the shafts and attatch them to the donut and look at the clearance you have it is amazing that they touch. what happens when the torque is being transfered is the donuts compress and swell and twist one bolt hole going in one direction and the other going the opposite way this can be severe enough to pull the output shaft out far enough to leak oil. on a road car driven legally this would not be a problem but on the rally car when the donut is stressed to the above described position and you add suspension at full droop or full compression they take an incredible about of mechanical abuse, when the car is lowered as low as yours you had permenantly induced this angle putting the donut under strain before it even takes any load hence why you broke them. But i think your mod for a lowered car with some sort of cushioning in the drive would work, what do you think ?
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by pubcrawler » Thu Jan 28, 2016 8:24 am

cov_climax wrote: Just check you have the yokes aligned, it looks like they are not in the picture, this will be pulsing the diff and could lead to faster wear than expected, at which point you'll suspect the lack of donuts.
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by skamanfrank » Thu Jan 28, 2016 9:30 am

moose wrote:some nice engineering going on there, i had an idea whilst looking at this and will throw it out there for you to consider, if you could incorporate a rubber coupling between the alluminium adapter it would cushion any shock load to the box and would be kept running in a vertical plain..... But i think your mod for a lowered car with some sort of cushioning in the drive would work, what do you think ?

Or incorporate a cush drive into the adaptor using bushes, similar to those found on sports bikes. That's my plan at the moment
123r2f5.jpg
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by moose » Thu Jan 28, 2016 11:28 am

looks good Frank might take a few damaged gearboxes possibly, to find a coupling with enough cush in it, i would still take some convincing to do what i do wit hthe rally car before changing hopefully James is going to do loads of drifting and development work for me, GO HOON young man! :)
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by The Nun » Thu Jan 28, 2016 11:40 am

Years ago I asked Ray Payne of Hartwell about solid driveshafts and if he did them or could do some as I was thinking it might be a good idea especially on an IMP that was tuned a little. His reply was dont ever fit solid drive shafts to an IMP transaxle thinking you will get rid of the problematic doughnuts, you will just cause the next thing in the drive train to fail and that will be the gearbox innards, they just arent up to the shock loading as standard it will get without the cushioning effect of a rubber coupling of some type.
I suppose Dave Weedon would be the best guy to say about this idea, he will soon say if its crap idea or not??
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by skamanfrank » Thu Jan 28, 2016 11:47 am

moose wrote:looks good Frank might take a few damaged gearboxes possibly, to find a coupling with enough cush in it
As it's just a basic round bush, they are available in a variety of sizes, stiffness and materials, which should mean that some calcs would allow you to arrive at the correct one



....Did I mention I start a new job at a finite element analysis company soon..... Might come in handy :lol:
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by Grahame59 » Thu Jan 28, 2016 12:51 pm

skamanfrank wrote:it's just a basic round bush, they are available in a variety of sizes…
Yep, I bought one last week for my garden. Lovely.
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by moose » Thu Jan 28, 2016 1:16 pm

i am not sure that will take the torque Grahame should have gone for ivy.
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by 19James » Thu Jan 28, 2016 1:33 pm

moose wrote:GO HOON young man! :)
Will do! :D
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by pubcrawler » Thu Jan 28, 2016 2:12 pm

We used to have one in our living room Grahame, more square :lol:
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by cov_climax » Thu Jan 28, 2016 7:59 pm

moose wrote:some nice engineering going on there, i had an idea whilst looking at this and will throw it out there for you to consider, if you could incorporate a rubber coupling between the alluminium adapter it would cushion any shock load to the box and would be kept running in a vertical plain, you would get some wind up with the torque from the engine fitting the grip from the tyres but it would not be fighting this whilst being at a severe angle due to the low stance of your car the two UJ's take care of that.
Eric Morrey has developed a similar system, using imp donuts purely as a Cush drive, with bearing in the middle and onto U/j's for articulation, he was breaking loads of comp donuts on his hill climb car.

pubcrawler wrote:
cov_climax wrote: Just check you have the yokes aligned, it looks like they are not in the picture, this will be pulsing the diff and could lead to faster wear than expected, at which point you'll suspect the lack of donuts.
Brian
Explain please 8)
A U/J gives an oscillating torque and speed when used at any other angle than straight, so you usually use two of them to cancel each other,out, however to do so you have to get the pain or phase of them in-line if one is off to the other you still end up with an oscillating torque in the shaft, which will transmit to the gearbox, it may not be much, but could lead to wear or failure, it's an unknown - might well last forever but if it doesn't, first suspect will be the lack of donuts.

The donut usually smooths it out the pulse generated from a single U/J and the main reason everyone is shy of removing the donuts is for fear of destroying gearboxes.

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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by pubcrawler » Fri Jan 29, 2016 7:37 am

cov_climax wrote:A U/J gives an oscillating torque and speed when used at any other angle than straight, so you usually use two of them to cancel each other,out, however to do so you have to get the pain or phase of them in-line if one is off to the other you still end up with an oscillating torque in the shaft, which will transmit to the gearbox, it may not be much, but could lead to wear or failure, it's an unknown - might well last forever but if it doesn't, first suspect will be the lack of donuts.

The donut usually smooths it out the pulse generated from a single U/J and the main reason everyone is shy of removing the donuts is for fear of destroying gearboxes.

Brian

Thanks Brian 8)
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Re: The stanced '67 Imp Super - SOLID DRIVESHAFTS

Post by impstress2003 » Fri Feb 05, 2016 6:02 pm

Not sure if this helps but here goes... For cushioning, maybe you can fit a Morris minor friction plate. My first imp had a sprung minor friction plate fitted to it, I think it's a 50s minor part as they share the 6.25" clutch diameter.

The only problem was that it appeared the springs were very slightly fowling on the inner radius of the flywheel, which it may be possible to sort with some machining I guess, from memory it would only have needed a tiny amount removed to provide full clearance.

I'm not recommending this as it's clearly a break from original and I never drove the car with it fitted, I replaced the clutch before its first mot. But, if you want a way to potentially reduce the shock on the box, I guess it might help?

Cheers.
Si
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