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  1. #1
    rxpdoo's Avatar
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    4 tech strokers are coming !!!

    talked to falicon today and he shipped out a 4 mm stroker crank. i believe it was lawracing but i could be wrong. now that means we are going to see some serious fast skis out there and he told me it was not the only one.


  2. #2
    Site Admin Green Hulk's Avatar
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    Thats awsome Bari, but remember strokers dont live well at high RPM's

  3. #3
    Connecticut CrazyA's Avatar
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    Hulk,
    Can you elaborate on this please? Why don't they live as long, technically speaking?
    Thanks...

  4. #4
    Site Admin Green Hulk's Avatar
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    The stroke is too long and long stroked motors don't live well at high RPM's.

  5. #5
    increasing the stroke increases the distance the piston travels at any one RPM. Piston travel should be kept under 4000 feet per min. which is the threshold of reliablity.

  6. #6
    way2fast's Avatar
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    The design of the 4-tec engine allows for some serious "stroking" because the stock bore is much bigger than the stock stroke. The best design for an engine is one with a square stroke/bore. You could probably get 1800, maybe 2000cc out of the 4-tec 1500. The Kawi 1200 was stroked to 1500 (STX15F) and retained reliability. It would be nice to have a NA SD 4-Tec 2000cc that would blow the sponsons off a SC 1500 and not have the Achilies Heel clutch to ruin an otherwise great mill !!!

    This is definitely in SD's future !!!!!!!

    Richard

  7. #7
    Site Admin Green Hulk's Avatar
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    Yea Rich, now that you mention it the stroke on these engines is extremely short.

    Bari, any idea what Falicon is stroking them to?

  8. #8
    With the Rpms you guys want to run 8400rpm
    the biggest you could go is a 70mm stroke
    a 4mm stroked(67.4mm) 4tec at 8400rmp nets 3700fpm piston travel. Under the 4000fpm line.

    a 100mm bore x 100mm stroke would be 5500 fpm and your engine life would be measured in operating min. not operating hours.

  9. #9
    Site Admin Green Hulk's Avatar
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    JP, how about those of us that are running 8800-8900 RPM's?

  10. #10
    Connecticut CrazyA's Avatar
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    The stock bore and stroke now is 100 X 63.4 = 1494cc

    A 4mm stroker crank would up it to 100 X 67.4 or 1588.3cc

    A total gain of 94.3cc

    The stock RXP makes .14390896921017402945113788487282 HP per cc

    Multiply our newfound cc's and we theoretically get an additional 13.5706157965194109772423025543507 HP from solely a cc basis.

    Sound about right in theory??

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