Cometic was the brand to use in my motorcycle racing days.
Since our cars are a bit known for HG issues, esp cars in Europe for whatever reason, maybe a slightly thicker HG isn't a bad idea.
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Oh, I did not mention that I run an Alpha-N mapping.
TZR (German retailer) sells gaskets from "Cometic" in various thicknesses. I still have to do some research on them...
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I've run my Hondas on 91 octane at around 13:1, but you need a really good tuner, and I'm not sure I'd run MAF at that point.
That seems awfully high for a street car, I'd probably also be looking at headgaskets.
It looks like SCE used to make a copper one but it seems to be discoLeave a comment:
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Compression ratio on (premium) pump gas
Hi,
Since I am planning to rebuild my motor, it will be getting some goodies including forged pistons raising the compression ratio to 12,5 : 1.
So far so good. However I also have a P54 cylinder head on stock that I acquired some time ago (mainly because it's BMW motorsport ported). This one has been ground off by 0,6mm compared to new OEM.
By my calculation that will further raise compression to 13,44 : 1, which does seem quite high.
Has anyone ever ran something like this or higher on premium pump gas? For reference the late GT3s have been at 13,3 : 1.
I can still counteract this by ordering a thicker head gasket...
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