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  1. #1
    Nick 20rxp04's Avatar
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    Just wondering if this has ever been done

    Hello everyone, I have been wondering for a while if anyone has ever put an RXP engine into an X-4 hull (96 xp-97-99 spx) or if this is even possible... if anyone has ever made this conversion, please post some pictures or a video because I would love to see it!!! just picture all that power in that little hull, the wave jumper that thing would be! maybe one day when I hit the lottery I will try to build one . Now Ive seen gprxp's and even an xpl-rxp on youtube, and they are badd, but If someone has an x-4 rxp please let me know!!!


  2. #2
    Ziggy's Avatar
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    I keep seeing teaser posts about this. Someone (not sure who) is supposedly doing one, but they haven't posted anything about it. There are a lot of talented people out there, but that hull is so shallow, even after cutting out the mid-hull you'd have to do a LOT of top deck cutting to get it all in there. One thing I've seen while putting 951 in one, is that these hulls are thin & weak. All that extra weigh has got to put too much stress on the hull.

    I'd personally rather see an aluminum rotary in one before a 4-Tec. 200+ normally aspirated HP without all the IC plumbing.

  3. #3
    Moderator RX951's Avatar
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    Closest thing to it. Dan has an XPL with a 4-tec. Its a very tight fit.
    http://www.rapidacceleration.com/

    http://greenhulk.net/forums/showthread.php?t=24127

  4. #4
    Nick 20rxp04's Avatar
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    Yeah somebody should try to drop a rotary engine in it! that would be even better! picture ripping across a lake at around 75-80 on a 96 xp! haha

  5. #5
    Ziggy's Avatar
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    Quote Originally Posted by 20rxp04 View Post
    Yeah somebody should try to drop a rotary engine in it! that would be even better! picture ripping across a lake at around 75-80 on a 96 xp! haha
    The rotary fits in a GSX hull (barely), and the 951 fits in an X4 hull (barely) so the rotary in an X4 would require a lot of glass work as well.

  6. #6
    Be a Hero...Punch a Koala Kaotic's Avatar
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    Quote Originally Posted by Ziggy View Post

    I'd personally rather see an aluminum rotary in one before a 4-Tec. 200+ normally aspirated HP without all the IC plumbing.
    where do you find an all aluminum rotary?
    the 13b Renesis from the Rx8?
    The one i have

    weighs more than the LS1 i put in my car.

  7. #7
    Ziggy's Avatar
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    The Renesis uses cast iron end plates like all of the others. This is what makes it somewhat undesireable for small watercraft. Add the weight of all the peripherals req'd and it gets around 270lbs. Racing Beat makes aluminum end plates that removes something like 70 of those pounds.

    Of course there are a lot of other things that can be done to save some of that 270lbs. But it takes a lot of time and development. Right now I only know of one guy with that much time and he lives in Norway (Trond the Viking)

  8. #8
    Ziggy's Avatar
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    Quote Originally Posted by Kaotic View Post
    The one i have weighs more than the LS1 i put in my car.
    How much does your LS1 weigh? Hard to imagine long block to long block that little rotary weighs more than that big 'ol V8!

  9. #9
    Be a Hero...Punch a Koala Kaotic's Avatar
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    Quote Originally Posted by Ziggy View Post
    How much does your LS1 weigh? Hard to imagine long block to long block that little rotary weighs more than that big 'ol V8!
    don't forget RB will charge you an ass load for them. Also the rotars are cast iron as well.

    I dunno about long block to long block, but i wouldn't doubt it. The 13bREW is 30lbs heavier than the LS1

    the stock REW is friggin heavy. (taken like 4 years ago)


    If they made them much lighter it would throw off that near perfect 50/50 weight distribution.

    (i'm talking about the FD3S not that POS Rx8 )

  10. #10
    Ziggy's Avatar
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    Yeah, but this is the configuration for watercraft.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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