Thread: RPM mods

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    Re: RPM mods
    #11
    Senior Member whitedragon64's Avatar
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    Yes mate and it will take the thrust loading much better , These box's are filled to the top and then a breather tube ran up to a Catch can so lubrication isnt the issue, These 2 RPM boxes are powered by ZX1400's and raced out here in Oz (Goose Racing) so they take a beating and with larger balls and not rollers there will be less ball speed = less friction = less heat build up too
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    Re: RPM mods
    #12
    Senior Member whitedragon64's Avatar
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    Time will tell I guess, its doing a desert race today and at 120 km long laps so will see if it comes home ???
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    Re: RPM mods
    #13
    The Wizard bdkw1's Avatar
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    Cooling is a lot easier to deal with than flex.
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    Re: RPM mods
    #14
    Senior Member whitedragon64's Avatar
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    Thats very true well its made it through the first days racing was clocked at 176 Kmh down one of the straights ( radar gun ) Fastest speed was a Pro Buggy 219 Kmh
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    Re: RPM mods
    #15
    The Wizard bdkw1's Avatar
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    Crickey! That's almost 140MPH. Post up some video.......
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    Re: RPM mods
    #16
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    Most are not running those speeds for that distance. I’d say heat in that box is cooking oil n bearings. A ext cooler n pump returning fluid to input bearing area.
    I also really like the 3rd bearing on outside of input shaft.
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    Re: RPM mods
    #17
    Senior Member whitedragon64's Avatar
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    Yeah that’s the main issue with the RPM s that the guys are having I have hit these rpm box’s with temp gun and seen 110 deg C
    but he finished the race 400 kms and came 2nd in class The class winner running full size car with 3.5 litre

    In my box I now run is fitted with external pump through an oil cooler with thermo controled switch for the fan along with a temp gauge so I can monitor the temps and havernt seen it rise above 80 deg C
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    Re: RPM mods
    #18
    The Wizard bdkw1's Avatar
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    110C=230F Not all that bad. I wouldn't worry to much until 122C. The diff's on our race trucks routinely see 150C.

    Outboard support bearing sounds like a winner. Would take all the flex out of it. Similar to what we used to do one the KZ1000 drag bikes. They got an outer bearing on the countershaft to keep it from twisting off.
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