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High comp' pistons

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    High comp' pistons

    Ok, say the rest of my engine stays the same(M30/3.5/cam/ported head/Emerald ECU/etc) but the pistons are changed for some light(ish) weight/high comp' ratio pistons that increase my compression from 9.0:1 to about 10.0:1

    What kind of gains could i expect to see ?

    Obviously i'm not expecting masive gains but i'd be interested to hear what you guys think ?

    Andrew

    #2
    i give it 20hp max
    : : 1984 318i : : PNW E30 Crew : : Sold!!
    Now becoming the R3vlimited Pro3 car
    http://www.r3vlimited.com/board/showthread.php?t=93780

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      #3
      I say 30.

      its an M30.
      R.I.P 07/01/09 - 04/23/10 :(

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        #4
        Thanks for the feed back so far guys, keep the opinions coming please ?

        Just to add i was guessing at the comp ratio before, i now know after some research it will make the c/r 10.6:1

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          #5
          whats the literage on it now?
          : : 1984 318i : : PNW E30 Crew : : Sold!!
          Now becoming the R3vlimited Pro3 car
          http://www.r3vlimited.com/board/showthread.php?t=93780

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            #6
            3.5 m30...
            ///M Inside

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              #7
              From my experience on putting high-comp pistons on my m20, I'd guess that a 25 hp boost in an m30 is not out of the question...
              This is your M20 on steroids:

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