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 BiX
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| posted on April 27th, 2005 at 09:28 AM |
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Compression test
HI i have been chasing a miss slowly in my engine, its a 1776, twin 40mm dells, slightly higher compression, and worked standard heads. So far for the
miss i have replaced the following
-coil
-cap
-rotor
-leads
-plugs are iridium and should last 20k plus and have only 5k and look a little black but ok.
-all conections are good.
now i was talking to someone last night, and he suggested it could be a burnt out valve?
it seems to run on three and backfire and pop alot. its its idling, and i remove each lead in turn, number one doesn't efffect idle. It doesn't back
fire much at idle.
I have a guage to compression check the engine, but forget what pressure it should be? 110 to 130 PSI?
can somebody confirm what pressure it should be and also any other ideas to check.
its been a few really bad months, with a broken gearbox (reverse completely gone), broken starter solenoid, burnt out ignition swtch, fuel pump
breaking...... and all in the last 4 weeks  plus the miss!!
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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Sandy
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| posted on April 27th, 2005 at 09:33 AM |
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Hi,
I did a compression check on my 1835 the other day and it was 140 psi in each pot. Doesn't mean yours will be the same, but just look for a large
difference, like 3 will be 110psi and one will be 75psi etc. How's the fuel? No water in the tank?
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BiX
Veteran Volks Folk
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| posted on April 27th, 2005 at 09:37 AM |
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had the tank out and cleaned out, so fuel is good, if it was water i would assume it would effect all cylinders?
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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Andy
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| posted on April 27th, 2005 at 10:02 AM |
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Condensor & points?
Unless you have electronic pick up?
A good stock motor should have over 130psi, so high compression I would expect to be higher again. All depends on state of wear of course, As Sandy
said, having them all close to the same is most important.
Also worth checking, but not likely your problem is does the dissy advance smoothly (vac & mech. depending on your dissy)?
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Sandy
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| posted on April 27th, 2005 at 10:03 AM |
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Yeh, but I sort of had the same problem, I'd take off no.3 lead and the idle would stay the same. Turned out I had water in the fuel, so I can't
explain it. Just thought it may be an idea.
Cheers.
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BiX
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| posted on April 27th, 2005 at 10:45 AM |
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thansk for the idea sandly, its better to check than not to and find out that was the problem. yet new points and tried another condenser.
its just getting annoying. i will check the compression tonite, and see if its all the same. i think the compression is about 8.9:1
the engine is under 25k old, but has been abused on the track, so extra wear and tear is expected
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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 helbus
A.k.a.: Pete S
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| posted on April 27th, 2005 at 01:47 PM |
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Could be a dud spark plug. It doesn't matter how good they look, it still could be.
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Menangler
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| posted on April 27th, 2005 at 03:42 PM |
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Blocked idle jet.
FAHRVERGNUGEN;
Description of a pleasurable sensation,
Experienced when a car and it's driver are in mutual harmony, A unique driving experience, Pleasure, Satisfaction,
A feeling experienced by Volkswagen Drivers.
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BiX
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| posted on April 27th, 2005 at 09:51 PM |
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well the plug is fine, i pulled it out and earthed it against the block, and it sparks nicely.
Good idea dave, but even under power it still misses, so assume the idle jet won't effect this?
I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!
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Menangler
A.k.a.: Dave Becker
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| posted on April 28th, 2005 at 03:49 PM |
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It sure will.
FAHRVERGNUGEN;
Description of a pleasurable sensation,
Experienced when a car and it's driver are in mutual harmony, A unique driving experience, Pleasure, Satisfaction,
A feeling experienced by Volkswagen Drivers.
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koolkarmakombi
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| posted on April 28th, 2005 at 04:09 PM |
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check the earth lead inside the dizzy
check for airleaks in the intake side
check exhaust for leaks
are all the valves adjusted?
Is the timing spot on?
how is the mixture, rich can kill plugs
check compression on all four and see if there is one dropping
you can check the valve by taking the carby off, looking in with an extension light to see a bit of the valve, a mate then turns the tip of the valve
with vicegrips, this is a real butcher way of doing it, dropping the engine to look at the head is the best option.
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