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Mannghi · Guest

So, what makes the euro engine produce more horses than the same year US engine? The difference betweeen 95hp and 125hp is kind of a kick in the teeth for us Yanks.o

Guest · Posted: Sat Nov 24, 2001 10:49 pm Post subject:

The difference is the compression ratio 8.0:1 vs 9.3:1. I belive the emissions control was the reason for the lower ratio in the US.

dwak · Guest

And exactly how did they change the copression ratio. Head gaskets and pistons?

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2743 Location: Sydney, Australia

the emission gear was different. The Aus/UK cars and probably all cars not destined for Nth America/Japan were tuned for leaded fuel - more advance, no cat. and they were lighter too with fibreglass bumpers.

larso · Guest

different ignition distributors (calibrated different) and pistons, and no emmisions, are probably the main thing. If you look at the curves in the haynes for the ignitions, I belive one of the old US 924s has a good curve, so it's a good tuning trick bolt on.

Diesel · Guest

Anyone looking for a Euro distributor can e-mail me. I've got one from a 79.

Mannghi · Guest

I have a '77 which I belive is the dizzy with more advance.(source AppleBit's web site) It would be the only advantage that year has though. Its all good though.l

Ants · Guest

Yeah its the compression ratio and Cat, fortunately we didn't have to have Cats and so could develop more power, Turbo's even more so.

Ants

924RACR · Posted: Tue Nov 27, 2001 2:49 am Post subject:

Think again about the distributors; sure, the curves are different, but mainly just in when you get full advance - comes in quicker in the Euro. You still get the same amount of total advance from the advance mechanism.

Just advance your static/base/idle advance setting. Problem solved. Also consider that once you get to 2000-2500RPM you're at full advance anyway.

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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
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