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304065 304065 is offline
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Join Date: Dec 2001
Posts: 9,509
Paolo, according to my calculations 92mm on a 70.4mm crank gives you 2808 cc (a 2,8), with 19,7 cc dome volume, you end up at 9,5:1, assuming a 68cc combustion chamber.

I think what you are reading from the other thread is using 906 pistons intended for a 2,0 liter twin plug engine with later 2,7 heads with modification to the cylinder to make them work. Going from a 72cc combustion chamber to a 68cc chamber achieves the increase in compression you describe.

'66 911 #304065 Irischgruen
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
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Old 06-11-2008, 10:16 AM
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