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M40 compression ratio

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    M40 compression ratio

    Hello all,

    Anyone out here able to help me with the compression ratio figures for the M40 motor?

    Thanks in advance!

    #2
    just a guess but I think it's 10:1 We don't have the M40 motor in North America so i don't know too much about them.

    M

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      #3
      9.0 for the M40b16
      8.8 for the M40b18

      these are the ECE specs and with cat. ;)

      1989 E30 318iS_______________________________1989 E30 325iC M-Technic I
      1997 E36 328iT
      1990 E30 325iT 24v SOLD
      1989 E30 325i 2.7i M-Technic II SOLD

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        #4
        Thanks for the reply guys! :D

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