NPB 646L - Update

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tomcat
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Re: NPB 646L - Update

Post by tomcat » Tue Feb 26, 2013 9:05 am

Progress has been very slow of late, due to me really feeling the cold weather.
Getting there though:-
Image

Have had to strip out the cooling hose double take-off I fitted as it does not seem to be seating tight enough :!: :!:
Removed to photo. Are any bits missing :?:
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Re: NPB 646L - Update

Post by ImpManiac » Tue Feb 26, 2013 11:51 am

Tom, the length of the shoulder on the spigot would seem to me to suggest that there is meant to be another washer between the spigot and the dowty seal (washer with rubber insert). I may be wrong. Are both dowty seals a good snug fit on the spigot? If not, it will be very difficult to get it to seal. :!:

The engine bay is looking superb! 8)

IM 8)
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Re: NPB 646L - Update

Post by Lars Hagermark » Tue Feb 26, 2013 12:19 pm

Are you sure the banjo was fitted with its widest opening towards the "hexagon"?
Don't ask me why I'm asking. :oops:
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Re: NPB 646L - Update

Post by tomcat » Tue Feb 26, 2013 12:24 pm

ImpManiac wrote:Tom, the length of the shoulder on the spigot would seem to me to suggest that there is meant to be another washer between the spigot and the dowty seal (washer with rubber insert). I may be wrong. Are both dowty seals a good snug fit on the spigot? If not, it will be very difficult to get it to seal. :!:

The engine bay is looking superb! 8)

IM 8)
Hi Paul
I wondered if there should be another washer of some sort. The dowty seals 'appear' to be a snug fit but, when in place I could still rotate the secondary takeoff without too much effort :!: :!:
Thanks for your comments.
Regards
Tom
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Re: NPB 646L - Update

Post by ImpManiac » Tue Feb 26, 2013 12:26 pm

^^ Lars's comment is also worthy of note, Tom. :wink: The banjo needs to be the right way up.

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Re: NPB 646L - Update

Post by tomcat » Tue Feb 26, 2013 3:52 pm

Lars Hagermark(DJH705) wrote:Are you sure the banjo was fitted with its widest opening towards the "hexagon"?
Don't ask me why I'm asking. :oops:
Hello Lars
Your comment understood and appreciated. :)
Regards
Tom
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Re: NPB 646L - Update

Post by cov_climax » Tue Feb 26, 2013 7:14 pm

I'd also favour copper or alloy washers over dowty washers for that application
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Re: NPB 646L - Update

Post by tomcat » Sat Mar 02, 2013 8:22 am

cov_climax wrote:I'd also favour copper or alloy washers over dowty washers for that application
Is there some technical reason for that preference please?
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Re: NPB 646L - Update

Post by cov_climax » Sat Mar 02, 2013 9:04 am

Just personal preference, the rubber sealing area takes away area from the face so it can cause distortion on parts with thin walls or smaller faces like a banjo fitting.
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Re: NPB 646L - Update

Post by bks974c » Sat Mar 02, 2013 9:05 am

ImpManiac wrote:Tom, the length of the shoulder on the spigot would seem to me to suggest that there is meant to be another washer between the spigot and the dowty seal (washer with rubber insert). I may be wrong. Are both dowty seals a good snug fit on the spigot? If not, it will be very difficult to get it to seal. :!:

The engine bay is looking superb! 8)

IM 8)
The depth of the shoulder is to allow the washer and the flange of the banjo union to be located.

Scott
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Re: NPB 646L - Update

Post by tomcat » Sat Mar 02, 2013 10:16 am

All in place and tight now.
Had purchased a deep socket which made things a lot easier.
Finished up using a combination of the dowty and copper washers. Copper for the smaller size and the supplied dowty against the shoulder.
We move on to getting the exhaust on now, then the Weber fitted. :)
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Re: NPB 646L - Update

Post by tomcat » Thu Mar 14, 2013 11:08 am

Some progress since last time but seems 1 step forward 2 back at times.
Was struggling with getting the sports exhaust on without it snagging on the heatshield. :roll:
As I was swearing and cursing suddenly a 'saviour' appeared in the form of Ibbo Snr. He had come to show me a picture of his latest purchase. However next thing he was under the car, the heatshield came off, and the exhaust with some struggling was in place loosely. My thanks to him for that. :)
On reflection I decided to go back to tweaking the heatshield so it could be in place, so off came the exhaust. :!:
I very very nearly can get the exhaust back. Decided to leave exhaust and concentrate on other things. I know the Ibbo's are busy with James trialling etc.,
So have trial fitted an oil catch tank with some heath robinson bracketery.
Question is do I run straight from oil fill point to the tank or utilise the original system and then run to the tank, instead of to the Solex :?: :?: The Weber 28/36 DCD has no connection for the oil mist.


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Re: NPB 646L - Update

Post by bazzateer » Thu Mar 14, 2013 12:44 pm

Hi Tom,

I'd just use the standard outlet and plumb that into your catch tank.
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Re: NPB 646L - Update

Post by Lotus-e-Clan » Thu Mar 14, 2013 1:28 pm

Yea as Baz says, you can run a pipe from the oil filler neck breather stub to the input of the catch tank and ideally you would run the output from the catch tank to the carb air box. In the absence of an airbox connection, some would simply vent the catch tank to atmosphere through a filter - but this isn't a socially responsible thing to do, and you loose out on vacuum assistance to help evacuate the crankcase.

When I use to use open K&N type filters, I plumbed in the catch tank output to the K&N filter coverplate...

What type of filter are you going to use on the Weber?

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Re: NPB 646L - Update

Post by tomcat » Thu Mar 14, 2013 5:41 pm

Thanks for comments. :)
Plan is for a K&N filter so will investigate connection.
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Re: NPB 646L - Update

Post by tomcat » Fri Mar 15, 2013 10:35 pm

The K&N filter I have does not have an inlet for the feed from the catch tank.
Thinking about drilling a hole for a 9mm dia feed and then using superglue to fix it in.

Anyone used some other system please?
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Re: NPB 646L - Update

Post by tomcat » Tue Apr 09, 2013 5:08 pm

More work done, all slow and with minor :roll: frustrations but:-

Image

Image

Minilite wheels fitted, some rear panel paint work done.
had terrible trouble getting one of the rear Weber fixing nuts on correctly, then suddenly bingo!!

Need to do check-list before starting up. Fingers crossed :wink:
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Re: NPB 646L - Update

Post by ImpManiac » Mon Apr 15, 2013 10:51 pm

Will you be able to get some video of the first start, Tom? :?: The car is looking great!

IM 8)
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Re: NPB 646L - Update

Post by tomcat » Fri Apr 19, 2013 4:47 pm

ImpManiac wrote:Will you be able to get some video of the first start, Tom? :?: The car is looking great!

IM 8)
Hi Paul
Will see if that can be arranged.
Just returned from a week in New Forest so 'catch-up' is needed :roll: :roll:
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Re: NPB 646L - Update

Post by Leumas » Fri Apr 19, 2013 6:04 pm

What a transformation. Amazing, Tom. Allan
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Re: NPB 646L - Update

Post by tomcat » Fri May 31, 2013 1:43 pm

At long last car starts and runs. Still requires some tweaking but progress at least :)

Had 2 oil leaks though. 1 from the oil pressure gauge take-off on the block which after much fiddling is now sorted.
The 2nd one is at the oil cooler itself. It appears to be from 2 locations, at a lower junction to the finned section and at the top of the vertical cylinder. Both on the same side.

Have a request in 'Wanted' if anyone has an oil cooler for sale please.

Is it possible to get these points welded up? Anyone experience on this please?

Thanks
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Re: NPB 646L - Update

Post by eebiegeebie » Fri May 31, 2013 1:50 pm

tomcat wrote:Is it possible to get these points welded up?
If it is the standard "bog brush" type cooler, I've a feeling they might be soldered joints, so might be repairable with normal plumbing equipment??? (or take it to a place that re-cores radiators?)
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Re: NPB 646L - Update

Post by tomcat » Fri May 31, 2013 1:54 pm

eebiegeebie wrote:
tomcat wrote:Is it possible to get these points welded up?
If it is the standard "bog brush" type cooler, I've a feeling they might be soldered joints, so might be repairable with normal plumbing equipment??? (or take it to a place that re-cores radiators?)
Yes understood.
Thank you. :)
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Re: NPB 646L - Update

Post by ImpManiac » Sat Jun 01, 2013 11:38 pm

It's great to hear you've got it running, Tom. :D :D

IM 8)
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Re: NPB 646L - Update

Post by tomcat » Sun Jun 02, 2013 8:42 am

having solved, or located, leaks in engine compartment now have to solve the leak at oil pressure gauge. :o
One soggy leg!!!!!!!!!! :roll: :roll:
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Re: NPB 646L - Update

Post by tomcat » Sun Jun 02, 2013 1:54 pm

Sorted I think. Amazing what an o-ring plus the fibre washer can achieve :!: :!:

Took long enough as could not move the steering wheel for some reason. :roll:

Never mind what else would I do on a nice sunny day :?: :) :lol:
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Re: NPB 646L - Update

Post by tomcat » Mon Jun 10, 2013 6:12 pm

Frustration continues as whilst car starts it does not run at anything resembling idling speed. :roll: :roll:
With choke out it runs furiously. Choke in a bit and it just cuts out.
Have had ibbo over and he is as mystified as I am.

Any ideas guys and gals :?: :?: :?:
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Re: NPB 646L - Update

Post by ImpManiac » Tue Jun 11, 2013 9:50 am

Inlet air leak? :?: :? That might explain why it only runs with cold start enrichment and only then at high revs. Air could be leaking through the joint between carburettor(s) and inlet manifold, manifold and cylinder head or even through badly worn throttle spindles or bushes (although I am sure you would have repaired the latter, Tom, knowing you :wink: ).

Is there an inlet manifold vacuum pipe off somewhere?

Just some initial thoughts.

IM 8)
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Re: NPB 646L - Update

Post by impmann » Tue Jun 11, 2013 10:48 am

On a 28/36, the choke is effectively a separate carburettor... for want of a better way to describe it. Therefore when you push the choke in, you transition the fuel/air mix into the first choke - if the main jet is blocked, that could cause it to stall.

As Paul says, air leaks can be a trouble spot too - check that the manifold is properly lined up and bolted up the head. 28/36 plus manifold is *very* heavy and therefore this joint can be troublesome - I've had lots of trouble with bad sealing on some manifolds. I've also had one manifold that had mounting faces out of true - I'd paid a lot for it from a "specialist" and it ended up in a scrap bin as it was poorly made and would have never worked... worth checking.

Good luck! 8)
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Re: NPB 646L - Update

Post by eebiegeebie » Tue Jun 11, 2013 2:46 pm

Looking at the photos, it seems you have the Mangoletsi type inlet manifold, arguably the best of the DCD manifolds for the Imp, so I doubt that's a problem. If the dizzy vacuum pipe hasn't come adrift, I'd say the most likely culprit is a blocked primary idle jet, not the main jet (I bet Tim meant the idle jet). Failing that, the starter mechanism on the DCD can give trouble, as has been said, but you need to take it to pieces to investigate that, so check the other things first.
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Re: NPB 646L - Update

Post by tomcat » Tue Jun 11, 2013 6:00 pm

Gents, thanks for your comments.

Answering points raised:-
Paul,
Carb was totally rebuilt by Carburettor Exchange at Leighton Buzzard using jets etc., as listed earlier in this posting. These were obtained from Northampton Motorsport. I would say, from my previous experience with Carb Exchange, that I have as good as new item. Carb Exchange did make a comment that the flange was straight and true.
Pretty sure there is no leak between carb and inlet. Mark was uncertain about the original gasket I had so I got a replacement [plus spare] from Fast Road Cars. Highly recommended. Ordered at 1530 and with me at 0930 next morning. Something about post from Somerset to MK :roll:
I am fairly sure everything is tight between manifold and block but will double check again. Have take-off for vacuum gauge in manifold but that is blocked off at the moment. Vacuum connection to distributor is also tight.
On Mark's visit he checked timing and even had rocker cover off to make sure all OK.

Tim,
Will check jet is not blocked. Yes manifold and carb do weigh a lot so will check everything properly lined up. Point on mounting faces noted.

John
Point on main or idle jet noted. Will investigate.

Regards
Tom
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Re: NPB 646L - Update

Post by tomcat » Fri Oct 18, 2013 12:13 pm

After a very bad summer health and family wise am getting things in place again.
Imp in for MOT and is running OK. Fine tuning needed.
More to report after result :roll: :roll:
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Re: NPB 646L - Update

Post by ImpManiac » Fri Oct 18, 2013 1:37 pm

Sorry to hear about your summer, Tom. :( I hope you're health situation is under control at the very least.

Equally, it's good to hear that the Imp is about to make it back to the road! :D I for one look forward to updates and pictures in due course.

IM 8)
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Re: NPB 646L - Update

Post by tomcat » Sat Nov 16, 2013 9:05 am

After minor hiccup at MOT and then additional items added vehicle has MOT; lowered springs and dampers and a front disc brake conversion fitted. :)
Now to tidy up the bodywork areas.
Pictures to follow.
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Re: NPB 646L - Update

Post by ImpManiac » Sat Nov 16, 2013 10:56 pm

tomcat wrote:Pictures to follow.
8) Excellent. Glad the car is all legal again, Tom. :D

IM 8)
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Re: NPB 646L - Update

Post by tomcat » Fri Dec 13, 2013 8:44 am

Picture as promised a month ago.
Where is time going??
Image

Car sits better now. Time to tidy up the bodywork
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Re: NPB 646L - Update

Post by ImpManiac » Wed Dec 18, 2013 5:14 pm

8) Looking really good, Tom! :mrgreen:

IM 8)
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Re: NPB 646L - Update

Post by itsshelby » Thu Dec 19, 2013 8:02 am

nice wee car tom :)
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Re: NPB 646L - Update

Post by bazzateer » Thu Dec 19, 2013 9:29 pm

Will we see you and the Imp at a few events next year Tom?
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Re: NPB 646L - Update

Post by tomcat » Fri Dec 20, 2013 4:24 pm

bazzateer wrote:Will we see you and the Imp at a few events next year Tom?
Hi Baz
I hope so. have a certain Ibbo plus son, who is bigger than me, 'suggesting' I will be.
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