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The engine, a 912 ULS 100 hp is hard to start

in 912 / 914 Technical Questions 13 years ago
Hej!
Motorn är svårstartad när den är varm. Förgasarna är synkroniserade. Tomgång 1400 varv. Vad kan det vara för fel?/Kenneth

  • Re: The engine, a 912 ULS 100 hp is hard to start

    by » 13 years ago

    Translation:

    "Hello!
    The engine is hard starting when hot. Carburetors are synchronized. Idle 1400 rpm. What can it be wrong? / Kenneth"


    ** Forum rules state that all posts are to be in English only.
    You will likely get more responses if you post in English
    Thank you.
      
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  • Re: The engine, a 912 ULS 100 hp is hard to start

    by » 13 years ago

    Hi Kenneth,

    We were just discussing this on another thread. When you shut down and have a nice tight cowl setup the heat just cooks the fuel lines and then vapor forms in the lines. The fuel pump does not pump vapors and the carbs don't work well either with partial vapor. First make sure all your fuel lines are fire sleeved which not only protects them from fire, but it does help some with insulation. Make sure your engine has a recirculation line. Don't use the choke on a hot start. Crack the throttle a tad to allow a little better flow. A tad does not mean a bunch, just crack it open. Once started let it run a few minutes to bring in and recirculate some cooler fuel which will help cool the fuel lines and fuel pump. Another tip is to use Header Wrap Cloth on your exhaust pipes down to and over the knuckles just above the muffler. This can cut heat from them by up to 70%. Here is my point.. If you fly your plane and land who would pull the top cowl off and grab their exhaust pipes?
    Not anyone on bare metal and expect to keep their skin. I have a vary large majority of my clients that have wrapped exhaust. When I fly and pull my cowl off I can grab my exhaust pipes and I get to keep my skin. The point is there is a tremendous help in heat reduction from connectivity and radiated heat. This heat reduction will save wires, hoses and help reduce fuel vaporization. The people I have done this for don't have any hot start issues. The cost is $50 for the 2" wide header wrap from most automotive stores.
    p.s.
    Everyone should have fuel and oil lines fire sleeved.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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