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Thread: new pitch ?

  1. #1
    MDGPR's Avatar
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    new pitch ?

    i am turning my trued 14/20 7320 rpms at 71 mph. i know i need to re-pitch, but to what and will i see a speed increase or is it just so the engine isnt turning to much?


  2. #2

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    Quote Originally Posted by MDGPR View Post
    i am turning my trued 14/20 7320 rpms at 71 mph. i know i need to re-pitch, but to what and will i see a speed increase or is it just so the engine isnt turning to much?
    You should be able to go to a 14/22 comfortably, I would guess... My setup isn't far from yours (but I'm ported) and I'm turning a 15/24 @7150 or so... I'm sure you'll get a lot of input!

  3. #3
    ABBOTT's Avatar
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    I would also say a 14/22 ---now keep in mind that a 14/22 will bring your rpms down a hair, but you may still be a tad on the high end (still above 7200) which is where you should be considering the time of year that it is.

    If you put on a 14/22 and run....say 7230's in this season, then you should be spot on for the summer season where you will see approx 80-100 rpms less on the exact same prop in 85-90 degree weather.

    Hope this helps.

  4. #4
    Me Hahn and Joe H204YOU's Avatar
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    You need one of Tommy Jordons pitch gauges It will pay for its self after 1 use I would go 1 increment at a time,say to a 21 if you dont turn over 7280 I would call it good.That way when it heats up next year,It should be easier for you to stay in the 7200 range.Not to disagree with anyone,but to give you a broader spectrum.Ive been making good progress going with the less pitch/more rpm theory.I think you should hit 72.6-73.2

  5. #5

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    When my ski was single pipe non ported, with similar mods to yours plus 3 degree advance keyway, mine turned a 14/22 7200rpm in the heat of the summer and was good for 77mph+
    You should be good with 14/22- 14/23

  6. #6
    r33pwrd's Avatar
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    Quote Originally Posted by Ronn25 View Post
    When my ski was single pipe non ported, with similar mods to yours plus 3 degree advance keyway, mine turned a 14/22 7200rpm in the heat of the summer and was good for 77mph+
    You should be good with 14/22- 14/23
    Wish i could run those #'s!!!

  7. #7
    cheatin' piston popper addicted's Avatar
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    Call carl at island.

    I have herd that 1 degree equals 100 rpm, but i guess that all depends on. . .

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