How to Increase Compression Ratio on a M8
HDF Community Team
Joined: Jun 2006
Posts: 12,774
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From: san antonio
What rigidthumper is tellling you is that "stock" chamber volume and deck height vary from motor to motor; the only way to know for sure is to measure. CC the heads and measure deck height. Most using one of the online calculators will use .007" as deck height and 86cc as chamber volume. I did some Googling and learned that CP/Carillo uses 86.5cc as M8 chamber volume for manufacturing purposes. I have no idea what the M8 piston dome volume is considering there are four valve reliefs. However, as rigidthumper also points out, guessing is guessing and no substitute for accurate measurements.
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