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Rotax 914 ignition timing

in 912 / 914 Technical Questions 9 years ago
Hallo
Can anybody explain how different ignition timing on 914 for top and bottom spark plugs ( 22-26 )
can prevent preignition and detonation.

  • Re: Rotax 914 ignition timing

    by » 9 years ago

    the timing difference extends the flame-front to lessen the chance of detonation. In other words the piston gets a less dramatic push from the combustion process.
      
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  • Re: Rotax 914 ignition timing

    by » 5 years ago

    Hi

    I have a fundamental question about theory of calculation of ignition timing.Especially in Rotax 912' manual stated that "in normal operation igntion occured 26° BTDC". How did they get that value?

    I mean Ignition timing (26° BTDC) is not a constant stuff. Why does Rotax claim (26° BTDC) ? 

    Regards

      
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  • Re: Rotax 914 ignition timing

    by » 5 years ago

    " How did get that amount? "

    That Sentence needs a subject. ???

    I am not sure of just what you are asking.

    Please restate the question in a little more detail.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

    Thank you said by: Michael
      
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  • Re: Rotax 914 ignition timing

    by » 5 years ago

    Michael wrote:

    Hi

    I have a fundamental question about theory of calculation of ignition timing.Especially in Rotax 912' manual stated that "in normal operation igntion occured 26° BTDC". How did they get that value?

    I mean Ignition timing (26° BTDC) is not a constant stuff. Why does Rotax claim (26° BTDC) ? 

    Regards

    Hi Micheal,

    I'm sure they got that from research and testing plus other engines. It isn't uncommon for motorcycle to be between 24-32 BTDC

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

    Thank you said by: Michael
      
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  • Re: Rotax 914 ignition timing

    by » 5 years ago

    Thank you Roger

      
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