I read in my performance bmw mag today that my 87 m20b25 has a higher compresion ratio than a post 88 m20b25 is that just in a euro car or what?
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different compresion ratios?
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9.7:1 I think. and yes.
before you go on a wild goose chase though - the bump in compression only made a 2-3hp difference in peak output. I've never seen a dyno comparison between the two engines directly to know if the total area under the curve for the high-comp B25 is significantly larger. My guess is no, because eventually they built all M20s with 8.8:1. the stock cam profile isn't agressive enough to take advantage of high compression.
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