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S50 Compression Test results

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    S50 Compression Test results

    First time performing a comp test today. Wasn't sure which 2 of the 3 exposed relays were the main DME and fuel pump, so I pulled all three. Also the #11 fuse for the fuel pump.
    **Read in some DIY to start the car and let it run until the fuel in the lines runs out once the fuel pump is deactivated. Mine cranked, but never started. Normal?

    Ok, so I did about 8 cranks per cylinder, twice for each cylinder. What should I make of these results? Plugs looked good, no oil in there either.

    215 205 215 193 198 205
    215 200 213 194 195 205

    Like I said, I've never done this test before so if there are possibilities of user error, let me know.
    Last edited by 99em1; 04-30-2010, 07:36 PM.

    #2
    looks like you have a healthy motor...
    looking for a e30m50 swap harness adapter pm me $150 shipped
    email nitroman12@gmail.com

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      #3
      Thought so. Cool.

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        #4
        its ok, but i would do leakdown to see why #4/5 are just a tad off. you have greater than a 10% variation between #3 and #4.

        i did test on my stock m50 recently and got slightly tighter numbers. 210psi +/- 8psi on all.

        and you had the throttle open all the way while you were doing the testing, right?
        marshall
        75 M2
        87 325
        97 m3
        02 325it

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