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  1. #1
    DUCKY UK's Avatar
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    RXPX 260 R&D intake speed report and problems?????

    Hey all,

    Tested a R&D intake grate on my 260 stock class at the weekend, mods to ski and speeds listed below.

    Ski was tested with 3bars of fuel with trim one click down from mid point.

    Base run was done on a Stalker Pro radar gun and ski ran 8620rpm with max speed of 74.6mph, this was done on three passes

    Bolted the intake on, bare in mind this is a moded R&D intake, all the slag and crap was smoothed and evened out.

    Ski then ran same RPM but 73.2mph and now has a slight cavitation on the hole shot.

    Im loving the extra hook up in the chop and don't mind losing the 1mph but the cavitation on the holeshot is a no go, my question is, I did not seal the intake on, I just bolted it on as the stock one has not sealant on??? does this make a diff????

    Can anyone help or have ideas on this cavitation prob???

    Love the intake for the hook up tho =)

    Cheers
    D
    UK


  2. #2
    WickedXP's Avatar
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    Mine cavitates too Ducky.. I think it's fairly normal for these intakes. You lose like 1 second on takeoff

  3. #3
    DUCKY UK's Avatar
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    BUGGER =( not good!!!

    Do you seal your intake on or just leave it clean bolted on bud??

  4. #4
    Aussiepauly's Avatar
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    No cavitation with my R&D grate and no silicon either, one click down will not get you best speed, one or two clicks up from middle for the straights and then one below middle for the corners

  5. #5
    DUCKY UK's Avatar
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    I know that's not the best place for the top speed, but I race with my trim one click down from mid, so not fussed about the speed apart from in a race condition.

    What prop are you running pal??? and what wear ring???

    Cheers =)

  6. #6
    Aussiepauly's Avatar
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    Set up your quick trim settings for straights and corners very easy to use, I been using it for racing, I bet with a stainless liner and 15/19 solas you will have no cavitation

  7. #7
    DUCKY UK's Avatar
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    yer I use the quick trim already pal, but most of our course in the UK are very small anyway, so by the time im on a straight ive already into a corner.

    running stock wear ring at the moment, as everyone said the SS ones grind away at your prop, so stuck with the stock plastic one and will change out every 30hrs. shes on 20hrs at the mo, but had no cavitation before the intake was fitted

  8. #8
    Aussiepauly's Avatar
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    Don't worry about the grinding of your prop bullshit mate change your prop once a year if you want, I did 15 races on my last prop and it still comes out perfect

  9. #9
    DUCKY UK's Avatar
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    well I put a SS on my old RXP 215 and that thing hooked up amazingly without an intake on. great more money to spend lol

  10. #10
    Bob 1tommygunner1927's Avatar
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    Quote Originally Posted by DUCKY UK View Post
    yer I use the quick trim already pal, but most of our course in the UK are very small anyway, so by the time im on a straight ive already into a corner.

    running stock wear ring at the moment, as everyone said the SS ones grind away at your prop, so stuck with the stock plastic one and will change out every 30hrs. shes on 20hrs at the mo, but had no cavitation before the intake was fitted
    If I were into racing.....ensure the engine is aligned correctly and set properly for fore/aft positioning, check and/or re-balance the driveshaft, R&D pump seal, impeller pitched correctly/balanced and fitted to a SS wear ring like a piston in a cylinder.

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