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Carb sync for beginners

in 912 / 914 Technical Questions 10 years ago

  • Re: Carb sync for beginners

    by » 9 years ago

    The best would be to have second test set of probes and gauge. But I haven't.
    Note that EGT reading in flydat is switching for about 8s from left to right side (you can see left/right arrow).
    I curious why I have highest temperatures cross. Naturally would be to have lower reading on PTO side (in case od cooling air).
    I'll try to clean/inspect probes and verify if they are connected in good order (PTO/MAG, L/R).
      
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  • Re: Carb sync for beginners

    by » 9 years ago

    When probes start to go bad cleaning won't help. It is an internal problem with the thermal-couple. If it were me I wouldn't look at the carbs causing such a big and wild swing, but the electrical side.

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

      
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  • Re: Carb sync for beginners

    by » 9 years ago

    Uhm, the best is to swap probes and see. If bad reading will travel through display it will be problem with engine, if it will stay - the probe is faulty.

    The problem is I have short wires and I have to disassembly cockpit for loose wires. A lot of work... but I can to do this.

    If not electrical it can be a problem with bad burning? For example bad compression on one cylinder?
    I tested a month ago cylinders and compression was equal (in norm) on each. I have only tool to make compression test (not leak down test).

    Engine after gearbox rebuild works smooth, if believe egt orders "faulty" cylinder is no 3 and on this cylinder I have CHT probe and reading is normal (about 82*C when 10*OAT).
      
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  • Re: Carb sync for beginners

    by » 9 years ago

    Wires and probes are for analyze, it's sure.
    I was reading that similar problem can occur when there is air leak on intake. I have carb flanges replaced a year ago and new o-ring on right side (I sent to rotax a month ago my cylinder head for replace pushrods shields). I put new o-rings but maybe intake manifold not fit exactly..

    What is the method for check leaks? I heard about using startup spray and observe rpm's.
      
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  • Re: Carb sync for beginners

    by » 9 years ago

    You spray the starter fluid around the manifold or carb mounts ,any increase in rpm means a leak.

    If you get too close to the air filters with the starter fluid ,if they are dirrectly attached to the carbs you could also see an rpm increase.
      
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