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914 surging at altitude

in General Tech Discussion 11 years ago

  • Re: 914 surging at altitude

    by » 11 years ago

    Jonathan
    Thanks I found it and downloaded it but my 914/TCU is very old (tir4.5a) :( and it needs a dongle decoding unit. I need your 16 year old son, does he want a holiday in France ;) .
    Does he or anyone on the Forum have any ideas or knowledge of how to bypass the dongle key and get this program running ??

    Mike G
      
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  • Re: 914 surging at altitude

    by » 11 years ago

    Jonathan,
    I too had a similar "surging" in my certified 914. It could be a fuel /carb problem.
    You could try the following too.
    Check the air intake hose for traces/deposits of oil - Rubber hose connected between Turbocharger & Air box. I believe a certain amount of leak is permitted here which also gets vented out through the air-box drain. If there is oil leak in excess to the compressor section in the turbo, then when the turbo is running it pushes the oil up in to the air box and to carbs and finally it gets mixed with fuel.

    I also observed that the older engines do not have this problem and the air intake hose will be dry. Some engines with OEM modified turbocharger seems to have this issue.
    Cleaning the carb should help.
    Good luck and update us on development.

    Rgds
    Shijo Francis
    Thank you said by: Jonathan Devine
      
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  • Re: 914 surging at altitude

    by » 11 years ago

    One thing to consider. On an extended high power run you may be running out of fuel to the carbs. Pull the power back and there is enough flow to make the engine happy.

    Just a thought.

    Alan
    Thank you said by: Jonathan Devine
      
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  • Re: 914 surging at altitude

    by » 11 years ago

    I can try a climb until it surges, then back off for a little while. If, somehow, the fuel is sucking faster than the fuel pump/regulator can provide, then it should catch up, and allow me to climb at full power again.
      
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  • Re: 914 surging at altitude

    by » 10 years ago

    Problem apparently resolved. Recent climbs to 8500, 9500 have been symptom free. Solution???? I have changed 2 simple things.
    1)I have been running on 98 octane Mogas instead of Avgas for about 15 hours.
    2)All my recent climbs to altitude have been cruise climbs. It is possible (memory fails me)that all the climbs with surging noted were maximum rate climbs and despite engine temps remaining green, local heat build up in the cowl may have led to fuel vaporisation.
      
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