Cranking RPM
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Thread: Cranking RPM

  1. #1
    Senior Member tombauer's Avatar
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    Cranking RPM

    Hi all, I need to know the cranking rpm of an electric start model. Must be accurate within 10-15 rpm, no guesses allowed!
    Thanks, Tom
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  2. #2
    Senior Member Badgerflorida's Avatar
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    Engine rpm or starter motor rpm? I’m not sure I can help but trying to think of how it could be observed or derived or calculated.
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  3. #3
    Senior Member tombauer's Avatar
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    engine rpm with plug in but not firing. the pickup coil could be used with a very low rpm tachometer, or a scope, or a mechanical gauge on the end of the crank.
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  5. #4
    Senior Member Badgerflorida's Avatar
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    I have none of the above, but could I do a simple stopwatch and count the strokes by sound? Sorry if this isn’t helpful.

    I really want to help because I think your CDI development has and will continue to help a lot of people who have exhausted most other options. The whole CDI thing should be filed under “Here be Dragons”. And I admire you for tackling it.

    Plus I want one of your CDIs with a tach wire. Cheers and good luck
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  6. #5
    Senior Member tombauer's Avatar
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    That's a good idea, could you send me a short video of your bike cranking over? 10 - 15 seconds?
    Thanks, Tom
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  7. #6
    Senior Member Badgerflorida's Avatar
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    Couldn’t upload a video so I put it here. Hope this helps. My battery seems pretty strong if you need a longer crank time.

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  8. #7
    Senior Member tombauer's Avatar
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    Thanks, I looked at the sound with Audacity and determined rpm was 416.

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