Race Engine Forum UK

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

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

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

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

Could be a problem with the contact breaker setting in the distributor.

G

Guy Croft wrote:Could be a problem with the contact breaker setting in the distributor.

G

OK ... I will have a look

thanks

Philippe