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  1. #1
    isa alnoaimi's Avatar
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    R&D transom plate question

    i have an FX-SHO with riva 12 vein pump 160mm & liner also is 160mm

    the liner matches the pump perfectly

    but the transom plate is still at 155mm
    is it ok to bore the transom plate to match the 160mm liner ?
    and also if i bored the liner i think i need to bore the intake grate so it matches the transom plate

    anyone who is reading , am i right on this ?


  2. #2
    isa alnoaimi's Avatar
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    anyone ?

  3. #3
    isa alnoaimi's Avatar
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    seriously no answer !!! till now !!!

  4. #4
    isa alnoaimi's Avatar
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    bore the transom plate like this ?

    Click image for larger version. 

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    to match the 160mm liner, is it ok ?
    there isn't any negative effects ?

  5. #5
    305coco's Avatar
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    Quote Originally Posted by isa alnoaimi View Post
    i have an FX-SHO with riva 12 vein pump 160mm & liner also is 160mm

    the liner matches the pump perfectly

    but the transom plate is still at 155mm
    is it ok to bore the transom plate to match the 160mm liner ?
    and also if i bored the liner i think i need to bore the intake grate so it matches the transom plate

    anyone who is reading , am i right on this ?

    you can safely bore the transom on the fx but, you shouldnt "open up" the grate. mark (mjh3ides) on here opened up his grate to match and had a very bad overstuff.

  6. #6
    isa alnoaimi's Avatar
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    thanks

    but what is the benefit from this ? better mid range and hook up ?
    i wont lose any top speed ?

  7. #7
    Gus13letter's Avatar
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    You will have less cavitation which will give better holeshot, but you will lose top speed. There is a good chance you will lose on the average of 2mph on top. It is a give and take with it. You will also probably have to repitch the impeller to increase rpm due to the added water. I have been on the fence doing mine. Especially since I just got done re-sealing it with the 5200 quick cure.

  8. #8
    isa alnoaimi's Avatar
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    thanks for the input

  9. #9
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by Gus13letter View Post
    You will have less cavitation which will give better holeshot, but you will lose top speed. There is a good chance you will lose on the average of 2mph on top. It is a give and take with it. You will also probably have to repitch the impeller to increase rpm due to the added water. I have been on the fence doing mine. Especially since I just got done re-sealing it with the 5200 quick cure.
    fzr-fzs is a whole different tunnel than a SHO tunnel, I would not bore a SHO tunnel unless you enjoy getting thrown of due to over stuffing.

    ISA, just use a 160 liner and a 160 impeller with a 155 pump and be done with it. I have been using that set up for years on my sho and many customers ski's and they rip out of the hole.
    Last edited by JIM'S PERFORMANCE; 06-30-2013 at 01:42 PM.

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  11. #10
    isa alnoaimi's Avatar
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    thanks jim will follow your advice

    your my master yoda

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