Compression ratios


Old 11-06-02, 06:24 PM
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Compression ratios

What affect does compression ratios have on h.p.? I know it affects what type of fuel you need to run. I have a 2.8 VR6 motor that I am in the process of boring out to a 3.0. I believe the stock 2.8 is a 10:1 and the pistons I have for the 3.0 are 9:1. I know I will have a hp increase due to the displacement but would I have seen better gains on the 3.0 with 10:1 compression?
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Old 11-06-02, 10:48 PM
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It's hard to say w/o a lot more info. If you're really curious, buy a computer program like Mr. Gasket Desktop Dyno. It'll let you 'build' an engine on paper & give you surprisingly accurate estimates of its power output.
Old 11-07-02, 06:13 AM
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compression=hp, but simply increasing compression ALONE is usually only good for 6% hp gain per 1kg increase in compression.
I highly doubt your car came stock with 10:1 comp. anything over 9.5 will not run well on pump gas. But with German engineering anything is possible.

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