O-540 Starting Question

edited September 24 in General Discussion

During the failed start procedure, it says to clear the flooded engine by rotating the engine approximately 10 revolutions while opening the throttle slowly. Two questions...

  1. How far do you open the throttle?
  2. How does opening the throttle clear a flooded engine; seems counter intuitive?

Thanks

Comments

  • We're going to need specific information here. What year and model of airplane and engine. What is "it" that you refer to?

    Scott Sherer
    FAA Master Pilot
    Piper Owner Society Forum Moderator and Pipers Author.
    Need help? Let me know!

  • 67 PA-32 6/260 with an O-540. The POH says:
    If the engine fails to start at the first attempt, another attempt should be made without priming. If this fails, it is possible that the engine is overprimed. Turn the magneto switch OFF, open the throttle slowly, and rotate the engine approximately ten revolutions with the starter.

  • Hey, thanks for the help!

    Scott Sherer
    FAA Master Pilot
    Piper Owner Society Forum Moderator and Pipers Author.
    Need help? Let me know!

  • I never us the primer on my 260. I just pump the throttle 3 times and off she goes.
    Hope this helps.

  • Still hoping for some insight into this.

  • I do very short hops in my 260 (9 mins is my normal flight time).
    Hundreds of starts a month.

    The 260 is one of the easiest starting engine I have sat behind.
    So possibly:
    you are flooding it.
    your mag timing is off.
    you have a broken primer line.
    Plugs gapped incorrectly

    Do you have problems all the time or just hot starts?

  • I guess you misunderstood my post. I never said I have been having problems starting my engine. She cranks like a champ each time. I was just trying to figure out the failed start procedure and make sense of it.

  • Thanks for the clarification. Hopefully our member participants can re-enter the conversation. Thanks again.

    Scott Sherer
    FAA Master Pilot
    Piper Owner Society Forum Moderator and Pipers Author.
    Need help? Let me know!

  • Well... I think I actually stomped the chumps with this thread. Never thought I'd see that happen. So let me try a new one. Still centered around start up procedures.

    1) Why is it necessary to let the prop spin one rotation before turning the Mags on and;

    2) Why do you only go to the left mag first till it starts then to both?

    Ok, fellas, take a whack at these!!

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