02GF74
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| posted on 17/4/07 at 10:30 AM |
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it stalled twice - any idea why?
1300 cc crossflow with twin dellorto 40s.
went out for a drive last night on some hilly roads, and on 2 occassions, slowing down before a T junction on a steep hill with very bumpy road
surface the engine stalled. 
Not had that happen before - tank over 1/2 full - started immediatley afterwards.
Very strange - anyone want to hazard a guess as to why this should have happened?
The very bumpy road and slope affecting the carbs in some way?
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stevec
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| posted on 17/4/07 at 10:36 AM |
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Keeping a open mind, could it be something like a coil wire dancing about on its terminal? Or a fuse that has a bad connection.
Steve.
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iank
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| posted on 17/4/07 at 10:43 AM |
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Have you used thackeray washers on the dellortos?
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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02GF74
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| posted on 17/4/07 at 10:47 AM |
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quote:
Originally posted by iank
Have you used thackeray washers on the dellortos?
yes.
ignition wires are on tight
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nick205
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| posted on 17/4/07 at 11:21 AM |
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I had the same thing a couple of times on my 2.0 Pinto with standard weber 32/36 carb when braking really hard for a junction. Haven't been
able to work out what caused it, but it hasn't happened for a while now.
I thought it might be momentary fuel starvation due to inertia? not sure how where though
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JAG
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| posted on 17/4/07 at 12:21 PM |
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I had this exact same problem with my last carburetted tintop - turned out to be a split in the petrol pump diaphragm.
Check the fuel pump is still able to lift fuel when driving up a hill - mine wasn't
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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Mr Whippy
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| posted on 17/4/07 at 12:49 PM |
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My buggy and the bluebirds do this when subjected to very bumpy ground. I think its the poor float being beaten to death and the carbs over filling
and pouring fuel down the carb bore and flooding the engine. The way I get round it is to keep it in a low gear so the engine processes more air and
keeps drier inside. That or not drive so fast! 
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mcerd1
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| posted on 17/4/07 at 01:00 PM |
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quote:
Originally posted by Mr Whippy
My buggy and the bluebirds do this when subjected to very bumpy ground. I think its the poor float being beaten to death and the carbs over filling
and pouring fuel down the carb bore and flooding the engine. The way I get round it is to keep it in a low gear so the engine processes more air and
keeps drier inside. That or not drive so fast!
or fill the float bowls with fuel tank foam as per the mod in Vizards pinto book
Anyone ever heard of anyone using this mod ?
[Edited on 17/4/07 by mcerd1]
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Mr Whippy
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| posted on 17/4/07 at 01:12 PM |
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or fill the float bowls with fuel tank foam as per the mod in Vizards pinto book
Anyone ever heard of anyone using this mod ?
nope first I've heard of that, not much room in my carbs float chambers for any foam that is unless some how the floats are replaced with
what...the foam, eh? hows that work?? got a pic?
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BenB
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| posted on 17/4/07 at 01:17 PM |
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Aha! Carbs..... Don't you just love them...
Fragile things which need adjusting with the subtlety of a Swiss watch maker, effected by vibrations, temperature, g-forces and just about any other
force exerted on them when attached to a car engine....
I'm still getting mine Dynojetted this Monday- but the end solution is to put them in the bin and go EFi!!!!!
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Mr Whippy
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| posted on 17/4/07 at 01:28 PM |
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quote:
Originally posted by BenB
Aha! Carbs..... Don't you just love them...
Fragile things which need adjusting with the subtlety of a Swiss watch maker, effected by vibrations, temperature, g-forces and just about any other
force exerted on them when attached to a car engine....
/quote]
you forgot the spec of dirt that brings the car to a stop in the middle of the motorway
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mcerd1
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| posted on 17/4/07 at 02:51 PM |
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quote:
Originally posted by Mr Whippy
or fill the float bowls with fuel tank foam as per the mod in Vizards pinto book
Anyone ever heard of anyone using this mod ?
nope first I've heard of that, not much room in my carbs float chambers for any foam that is unless some how the floats are replaced with
what...the foam, eh? hows that work?? got a pic?
Its his way of making them work for offroad racing
I think you remove the floats and replace them with a system that uses a second fuel pump to scavenge the excess
I'll see if I can get teh details later if you want
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MikeRJ
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| posted on 17/4/07 at 03:49 PM |
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Re: Vizard mod,
Float is removed, and a scavenge pipe is mounted vertically in the float chamber, coming out of the bottom via a gland. Height of pipe within float
chamber determines fuel level. Main fuel pump pumps all the time, a second high flow fuel pump on the scavenge side keeps level from going over the
top of the pipe.
The float chamber is foamed to keep the level as stable as possible and reduce fuel foaming.
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