Hello
I finished my latest car, it's an Fiat 128 3P.
I will use it in the french hillclimb championship for historical races,in group 2.
In France the name VHC ( véhicules historiques de compétition). I would like to have your opinion about ignition advance.
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I got few informations about it, but I would like to compare with your suggestions.
First, you have to know that I have to keep standard ignition system ( due to FIA regulation)
Volumetric ratio is 10.6, engine is prepared for high rev's (maxi: 9000 RPM)
Informations I got from a pilot in Italy is to adjust to:
max: 28° at 4000 RPM ..Otherwise, ther would be a big risk for the pistons ( which are forged)
It's seems realistic ...
What are your comments ?
Philippe74
PS: if somebody needs more infos about this engine to give an answer ...no problem
Fiat 128 - ignition advance
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Re: Fiat 128 - ignition advance
Phillippe,
My 1500cc Fiat SOHC engine which has forged pistons, and comp. ratio of 10.8:1 revs to 7,500 rpm, has 30 deg max advance. There was no more power to be had from more advance, and only slightly more at 30 than at 28 degs. ( I mean fractions ) The engine has about 28 degs by 4,250 rpm. Swinging the ignition on a fully open throttle did not seem to affect power readings much at all.
Hope his helps,
Regards, James Bowen
My 1500cc Fiat SOHC engine which has forged pistons, and comp. ratio of 10.8:1 revs to 7,500 rpm, has 30 deg max advance. There was no more power to be had from more advance, and only slightly more at 30 than at 28 degs. ( I mean fractions ) The engine has about 28 degs by 4,250 rpm. Swinging the ignition on a fully open throttle did not seem to affect power readings much at all.
Hope his helps,
Regards, James Bowen
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Re: Fiat 128 - ignition advance
Thanks James
I forgot to say that my car is a 1300 cm³
Anyway, it seems to reach this 28° value ...is OK
Regards
Philippe
I forgot to say that my car is a 1300 cm³
Anyway, it seems to reach this 28° value ...is OK
Regards
Philippe
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Re: Fiat 128 - ignition advance
Hi
Impossible to obtain 28° at 4000 RPM and also a correct advance at iddle speed !! My engine at 1000-1500 rpm knock and stop
If I want to start engine easily, I have to increase a little bit advance, but after I have approx. 30 to 31 ° at 4000 RPM
Do you think it could be due to the springs ? may be they are too soft ?
is it possible to find new springs ?
Regards
Philippe
Impossible to obtain 28° at 4000 RPM and also a correct advance at iddle speed !! My engine at 1000-1500 rpm knock and stop
If I want to start engine easily, I have to increase a little bit advance, but after I have approx. 30 to 31 ° at 4000 RPM
Do you think it could be due to the springs ? may be they are too soft ?
is it possible to find new springs ?
Regards
Philippe
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Re: Fiat 128 - ignition advance
Could be a problem with the contact breaker setting in the distributor.
G
G
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Re: Fiat 128 - ignition advance
OK ... I will have a lookGuy Croft wrote:Could be a problem with the contact breaker setting in the distributor.
G
thanks
Philippe
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