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Thread: bouncing needle or something worse?

  1. #1

    bouncing needle or something worse?

    The pucker factor is starting to increase a little.
    Since I've owned N7966L (65 hours), I've been carefully watching the
    engine.
    It's always consumed a lot of oil, and I've been plugging the leaks
    as I find them. However, it has always run really strong.

    Last weekend, I flew about 4 hours. On climbout the RPM
    was "bouncing" a few hundred RPM. Once level, no more bouncing.
    I'm wondering if this is something wrong with the instrument or an
    indication of something wrong with the engine. I didn't notice the
    engine behaving strangely. It climbed normally. It may have been
    wind/turbulence etc., but I *thought* I felt a single prop-bump, but
    I was already on edge because of the RPM.

    Flew again, and it's still bouncing. It's still performing well,
    though. Any ideas? Thinks I could take a quick look at to help
    diagnose?

    Oh yeah, one new cylinder, comps high 60's to mid 70's, 1100 SMOH on
    the IO-360.

    Thanks,

    Adam
    N7966L
    Super III




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  2. #2

    bouncing needle or something worse?

    If it is a cable drive(mine is) I suggest lubing the cable. Fixed my
    RPM bounce. Just a thought.
    Allen
    Down Mexico Way
    ---



    In musketeermail@yahoogroups.com, "Adam" <weissfamily97@c...> wrote:
    > The pucker factor is starting to increase a little.
    > Since I've owned N7966L (65 hours), I've been carefully watching
    the
    > engine.
    > It's always consumed a lot of oil, and I've been plugging the leaks
    > as I find them. However, it has always run really strong.
    >
    > Last weekend, I flew about 4 hours. On climbout the RPM
    > was "bouncing" a few hundred RPM. Once level, no more bouncing.
    > I'm wondering if this is something wrong with the instrument or an
    > indication of something wrong with the engine. I didn't notice the
    > engine behaving strangely. It climbed normally. It may have been
    > wind/turbulence etc., but I *thought* I felt a single prop-bump,
    but
    > I was already on edge because of the RPM.
    >
    > Flew again, and it's still bouncing. It's still performing well,
    > though. Any ideas? Thinks I could take a quick look at to help
    > diagnose?
    >
    > Oh yeah, one new cylinder, comps high 60's to mid 70's, 1100 SMOH
    on
    > the IO-360.
    >
    > Thanks,
    >
    > Adam
    > N7966L
    > Super III




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