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Thread: RXP tunnel size

  1. #1
    Mongoose's Avatar
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    RXP tunnel size

    Can anybody post the dimensions of a RXp pump tunnel?
    Length, width depth etc?
    Thought I would ask before Billy does!
    It's a bit of a follow up to the GPR pump tunnel discussion.
    I want to know the approximate differnce in the 2.
    Thanks


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    Moderator RX951's Avatar
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  3. #3
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    Mongoose, I might be able to get those measurements later today, but to compare to the GPR, the measurements need to be taken in the same spots. Tunnel depth depends where you measure it, etc. You provide the GPR measurements and I will try to get the RXP measurements and we can compare. Measure in mm or inches?

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    Mongoose's Avatar
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    Good point Vern.
    I don't want anything exact at the moment, just a general guide to the size compared to the gpr.
    MM would be great!
    Just the rough guide to width, length, and height, say from the rear edge of the pump shoe to the tunnel top, just to see if there is a difference.
    Once we establish a difference, as you say, we will need diagrams, accurate points of referance etc, but for now a rough guide is fine.
    My theory is that Yamaha have made their intake tunnel larger than it needs to be to keep the top end in check.
    As a guide, approximate dimensions of the gpr tunnel are (This is after a bottle of good wine, so by no way exact!)
    Length:430mm (this is where the moulding starts bending up to form the pump tunnel to the rear most opening of the oem intake grate)
    Width:125mm
    Height straight up, (but obviously slightly to one side of the driveshaft) from the stock intake: (Rear most opening) 150mm
    With the intake grate and driveshaft in place, and using a cheap steel measuring tape, please don't take these readings as gospel, just a ballpark.
    Last edited by Mongoose; 01-07-2007 at 06:10 PM.

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    OK, rough numbers are 125 mm across (I measured GPR at 121 mm across), from intake grate front bolt to 'biting edge' of grate is 312 mm, and measuring more or less straight up to the tunnel from the back biting edge of the grate, 155 mm 'deep'.

    The GPR grate rises very sharply for the first 30 mm, going up an average of 50 degrees, then the pump shoe rises approximately 20 degrees to the impeller. The RXP rises approximately 30 degrees all the way to the impeller ... definitely a different setup than the GPR (with 1200 grate).

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