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Thread: Engine performance mystery

  1. #11

    Join Date
    Oct 2011
    Location
    WA
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    1,196
    Might be prop getting vortex ring at static and needs forward speed to get a good bite.

  2. #12
    FlyingRon's Avatar
    Join Date
    Aug 2011
    Location
    NC26 (Catawba, NC)
    Posts
    2,548
    Quote Originally Posted by Bill Berson View Post
    To get the 2700 rpm in cruise on a 150 you might need to climb an extra 100 feet above cruise altitude and push the nose down for a short dive to get the 105. My primary instructor showed me that 45 years ago but I haven't flown a 150 since.
    Called get it on the "step".
    Mostly OWT. Doing the pushover may get you to the steady state faster but the steady state is going to be the same whether you level off at the altitude or overshoot and dive.

  3. #13

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    Oct 2011
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    WA
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    1,196
    Engine runs hotter with friction until after 20 hours or so.

  4. #14

    Join Date
    Sep 2014
    Posts
    2
    Check exhaust for obstruction. Same for carb heat box. Check fuel system for proper venting and flow. Verify carb fuel inlet screen is clean. If carb is older, might think about exchanging for factory rebuilt. Or barrow a different carb to see if makes any difference. Check throttle shaft to throttle arm security. Last time I saw a similar RPM reduction problem on takeoff, it turned out to be a crankshaft bearing issue. #2 bearing support was found cracked. Most likely this is not the case since engine was just overhauled. May want to try an oil sample looking for elevated aluminum or bearing material. This is a tough one. Looking forward to see what it turns out to be.

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