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Thread: 15F Compression

  1. #1
    RonJon's Avatar
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    15F Compression

    Has anyone done a compression test on their 15F?

    What should it be in PSI?
    How many hours on engine when you tested it?

    Thanks!


  2. #2
    jtskir15f's Avatar
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    i havent done one, but i know its a crazy high number. something like 250 psi

  3. #3
    yami_rida#26's Avatar
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    Quote Originally Posted by jtskir15f View Post
    i havent done one, but i know its a crazy high number. something like 250 psi
    not surprised the 15f i rode had an awesome holeshot and midrange

  4. #4
    inchadeboca's Avatar
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    hope this helps

    " The compression of a stock 15F engines we've tested tended to range between 170+/- and 260+/- psi. I know that's a wide range and can't tell you exactly why. Believe it or not, that's what the manual calls for. A new engine will run on the low side. As the rings seat the compression will rise. As the engine wears from excessive running time the compression will begin dropping again "

    i got this information straight from riva crew (administrator) over at the riva forums, i would take as pretty damn accurate info.

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    RonJon's Avatar
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    Haha yeah I'm the one who posted that question on the Riva site.

    I just want to know what numbers other people are getting and at what hours???

  6. #6
    My compression was 165 lbs, but that is with a 1mm spacer plate. Don't quote me on this but I think it was around 190 psi stock compression with no spacer plate. The manual states it can be any where from 150-250 psi

  7. #7
    RonJon's Avatar
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    STRIZKI... Why the spacer plate?

    150 to 250 is a huge gap. It makes you wonder how 2 stock skis in a drag race would compare if one had 150 psi and the other 250 psi... You'd think the take-off would be extreamly different between the two... Any thoughts?

  8. #8
    I put the spacer plate in to lower the compression for the turbo I added. As for drag racing I would assume you are correct, the boat with the higher compression (all other variables consistent) would take off faster and probably run better.

  9. #9
    inchadeboca's Avatar
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    Quote Originally Posted by RonJon View Post
    Haha yeah I'm the one who posted that question on the Riva site.

    I just want to know what numbers other people are getting and at what hours???
    damn what a small world

  10. #10
    RonJon's Avatar
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    I wonder what the compression is for the offshore kit with the high-compression pistons???

    Maybee 300 psi or more???

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