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What compression Ratio?

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    What compression Ratio?

    Im building my 2002 m10 soon (street car).
    Parts i have so far

    HD Rockers
    IE 292 Camshaft
    HD single valve springs
    Rocker locks
    Twin 45 DCOE Webber's
    Full exhaust including Headers
    Ordering Forged pistons from IE (Ross Racing)

    Now what is a compression ratio that i can use on pump fuel being 98 octane. (I'm thinking 10:5.1)


    329i

    #2
    I believe you Aussies measure octane different that us Yanks. For the typical 'hi-test' we get here, 9.5 would be a better option than 10.5 - to avoid pinging at best tune.

    Tom

    v i s i o n a u t i k s

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