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Thread: compression issue??? 57 Panhead

  1. #1

    Default compression issue??? 57 Panhead

    checking compression both cylinders showing 75 PSI.
    also have a bad manifold leak working on it
    bike runs like SHXX.
    is 75 PSI low compression and should I be looking to change rings and pistons
    bike is a stock 57 Panhead FLHF
    thanks

  2. #2

    Default

    Compression tested with the engine warm, the other plug removed, and throttle held open?
    The expected reading is (roughly) the static compression ratio X 15 (hot cam) to 20 (mild cam), and FLH @ 8.5:1 should show 127-179 psi.
    Yes, that's bad, probably time for a top end.

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