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  1. #1
    flyboy's Avatar
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    gained 40 RPMs removing washer

    I took the washer out from behind the prop, and Gained 40 RPMs.

    This was done with back to back testing.

    Just figured I would let everyone know.

    prop was a DF 14/24.5 SB


  2. #2
    Moderator OsideBill's Avatar
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    I have some issues with the upgraded washers. I have had one actually come over the lip of the dynafly and get stuck on the OD of it. From my comparison of the new washer to the old it seems the old washer actualy spaced the impeller from the lip on the pumpshaft the new ones do not. I also see that depending on how accurate the shaft is pressed in and located (shoulder of shaft to pump housing) makes a difference. The only function I see for the new washer is to give some initial protection to the pump seal I see no other benefit. Glad to see you found some more RPM's

  3. #3

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    have you removed the cone in front of the prop?

  4. #4
    flyboy's Avatar
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    Quote Originally Posted by CARVER View Post
    have you removed the cone in front of the prop?

    I never put one on

  5. #5
    HopatcongGPR's Avatar
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    thats odd....removal of the spacer will load the pump more.

  6. #6
    All hail the Chief! fullboogie's Avatar
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    Ok, not looking to start anything - I really want some info on your testing. Did you test before/after with the engine warm? I'm just wondering if the extra rpm's are from your engine having cooled down while removing the washer. We're all looking to eek out some extra rpm, so if this really works, I may try it.

    Thanks-

    Boogie

  7. #7
    flyboy's Avatar
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    no prob man. not only did I do back to back testing within 5-10 minutes, I also tested the prior day

    all I could get on day one and 2 was 7030. on day 2, 5-10 minutes after SEVERAL runs, buy me and another person, I took the washer out and gained 40 RPMs. put the washer back in lost 40 RPMs, took it back out gained, and left it out.


    figured I would try to post something good in the midst of all the bad going around right now

  8. #8
    mtrager's Avatar
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    I would think you would be turning that prop more than that with a big bore?

    You are talking about removing the donut/spacer that keeps the prop out of the pump?

  9. #9
    flyboy's Avatar
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    yes, that washer, it is a big thick washer.

    this prop was done by carl, and it is WAY too steep

  10. #10
    All hail the Chief! fullboogie's Avatar
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    Thanks for the info FB

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