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rlgMcoupe

What compression would this be?

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I am about to get a my car back from a engine rebuild and was wondering what compression it would be. It has an E12 head, piano top pistons and because this is not the first bore it will be 1.2mm over. Both the head and block have been decked so I assume that adds a little to the equation. Anyone know either how to calculate compression or since I assume this is a common setup what it is?

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Sure.

Step 1- measure the combustion chamber volume....

t

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should indicate the compression ratio. If they're factory pistons, they are most likely either 8:1 (standard on US spec cars) or 9.5:1 (Euro tii pistons, a popular upgrade for rebuilding US engines). Or they might be 9.0:1 pistons, standard on US tii's...

cheers

mike

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