Hola,

Now that I am getting a US spec 944 I have been wondering what I can do to bump up that power to Euro spec I have heard different things about why it has more power, mainly higher compression. Does anyone have any solid info on what the differences actually are? Different pistons? Possibly a different head? What about the electronics? I am sure if I look long enough I can find the parts I need in a junk yard....

Danke

 

From what I understand...
Different Pistons to get to higher compression.
Different DME mapping for the higher compression
No CAT
Not sure of anything else

 

I am not sure exactly when, but at some point in the mid to late 80's even Euro models came with a catalytic converter.

Any of our Euro poster speak to this detail?

 

A friend of mine has a euro that we just did the head gasket on. The pistons are definetly different for more compression. Not sure if the head is different or not.

 

i am not sure if the Euro models would pass emissions (hence the lower compression ratios here @ 9.5:1), but this what another <a href="http://membres.lycos.fr/arjona/porsche/p_944.htm" target="_blank">page</a> says (you know FWiW, and yes they do and have come with catylitic converters, just go to mobile.de and look):

[quote]
Ses 2479 cm3 avec un taux de compression élevé de 10,6:1, lui permettent de développer une puissance de 163 ch à 5800 tr/mn, soit 38 de plus que la 924 mais, il faut le noter, 14 de moins que la 924 Turbo
<hr></blockquote>

translation (more or less):
[The] 2,5 litre compression ratio raised to 10,6:1 permitted it to develop 163 Hp at 5800 RPM, which is 38 more than the 924, but one must note that it's 14 less than that of the 931.

I'm an 'Merican, dammit!

 

on another note, i am wondering what it would take, cost-wise and in method, to get an engine to 11:1 compression for the 944-spec (racing).

any ideas out there (maybe a new topic post)?

 

[quote]Originally posted by deni durrell:
<strong>on another note, i am wondering what it would take, cost-wise and in method, to get an engine to 11:1 compression for the 944-spec (racing).

any ideas out there (maybe a new topic post)?</strong><hr></blockquote>

Well if you have the head off not that much as you just machine off as you would to flatten. Only differnce is more material.

I remember Paul Bloomberg doing that, but they did not get the head to 11:1. Something about a part of the head getting thin and his tech (very well respected) did NOT advise going further. Got to 10.6:1 I think.

Also you risk damaging the head. A Guy in the 944 spec had shaved head to get closer to 11:1, but when it ran hot and he warped it there was not longer any material to remove so the head was junk!

Personally the best way to get there is with euro pistons, but this is VERY expensive due to parts cost alone and not legal per 944 spec rules.

The intent of the 11:1 allowance is to give some room for a stock head to be machined back to flat after warping and not to be make illegal. This is why the wording only allows head machining and requires stock pistons and such to keep costs down. Simply the CR bump is really a side benefit.

 

seems like the gains wouldn't be great with any work done on the head, unless pistons were used, and i guess that's illegal and not in the spirit of the series. hmm.. (re: 944-spec, shoot me a msg &lt;mrfrog@100palm.com&gt; if it's ok).

 

Deni,
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