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Thread: prop size help

  1. #1

    prop size help

    i know its been discussed before but after reading around a little should i get a 13/19 or a 14/20 for my 01gpr.. ski has a fresh rebuild, 1300 reeds, chokes removed, d plate, and riva fa's.. right now im pulling 7250-7280rpms wide open with a good safe tune, sometimes it says 7350 but i think it might be from slight waves bumpin me out of the water..ski spins the current prob pretty good from a stand still till about 12mph


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    Quote Originally Posted by jplowman2005 View Post
    i know its been discussed before but after reading around a little should i get a 13/19 or a 14/20 for my 01gpr.. ski has a fresh rebuild, 1300 reeds, chokes removed, d plate, and riva fa's.. right now im pulling 7250-7280rpms wide open with a good safe tune, sometimes it says 7350 but i think it might be from slight waves bumpin me out of the water..ski spins the current prob pretty good from a stand still till about 12mph
    14/20 concord solas should do fine with those mods IMO, Tommy Jordan

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    "just sayin".. jetdave56's Avatar
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    13/19/ -14/20

    i have the 155mm pump and i went from a 13/19 to df 14/20. The 13/19 was good strong accel but 14/20 stonger and 2 mph on top.Isn't the 01 smaller 144mm,I understand the concord 14/20 gives best results for that pump size

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    I plan on adding the island racing & leo holeshot in the near future. Wit these 2 upgrades to the addition of my current upgrades listed below which impeller would you guys recommend?

  5. #5
    so i need a concord 14/20 for best all around results..if im a little low on the rpms ill just send the head off and get it milled to 140-150 psi, id rather not but if i have to i will

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    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by jplowman2005 View Post
    so i need a concord 14/20 for best all around results..if im a little low on the rpms ill just send the head off and get it milled to 140-150 psi, id rather not but if i have to i will
    14/20 concord will work, but you will probably need to de-pitch to like a 12/19 or so

  7. #7
    Quote Originally Posted by WFO View Post
    14/20 concord will work, but you will probably need to de-pitch to like a 12/19 or so
    i dont know a whole lot about the numbers but would i be better off getting a 13/19 then, seem closer to the 12/19... anybody know what stock is

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    Ya Boy Trevor bajaeater's Avatar
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    14/20 is a different hub size and processes more water then the 13/19. 14/20 in my opinion is to much inless it is bent to like a 12/19 like wfo said. mill ur head it will help.
    i used a 13/19 with ur setup but ended up bolting a 14/20 on it but i had 150 psi compression

  9. #9
    Quote Originally Posted by bajaeater View Post
    14/20 is a different hub size and processes more water then the 13/19. 14/20 in my opinion is to much inless it is bent to like a 12/19 like wfo said. mill ur head it will help.
    i used a 13/19 with ur setup but ended up bolting a 14/20 on it but i had 150 psi compression
    Still got the 13/19? I think I want to try that since I really don't wanna mill the head at the moment

  10. #10
    Ya Boy Trevor bajaeater's Avatar
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    yea i do but its about to go on my other ski sorry.

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