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Thread: riva sc boost

  1. #1
    rxpdoo's Avatar
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    riva sc boost

    i am more intrested what the boost is on this new riva sc assembly. also i know for a fact that a stock head has problems running at 8400 rpms(valve floating) i hope they are right about that or we will see alot of rebuilts in the near future.


  2. #2

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    Put .030 shims under your valve springs it will help.

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    RXPDAVID's Avatar
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    rxpdoo, I hope not since I am in my 3rd year of running 8400 rpms on a stock head. About 130+ hours on it also.

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    Quote Originally Posted by RXPDAVID
    rxpdoo, I hope not since I am in my 3rd year of running 8400 rpms on a stock head. About 130+ hours on it also.
    I also heard that one of the fastest moded RXP's from my riding area is running @ 8400 peak rpm's without any kind of issue, this same ski ran 76 + MPH all day long in over 90 deg air.

  5. #5

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    Quote Originally Posted by rxpstan
    Put .030 shims under your valve springs it will help.
    Stan, just wondering if we have to remove the head from the engine to shim the valve springs? my local tech wants to charge me over $150.00 bucks just for the head gasket + labor but the mechanic that fix our bussines trucks and cars told me that he have a special tool to do this job with the head in place, how do you did yours?? thanks

    Ray

  6. #6
    Site Admin Green Hulk's Avatar
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    Lets not concern ourselves with impressive boost numbers.

    Its volume of air that is more important.

    Also, 8400 RPMs is proven safe for the stock valvetrain.

  7. #7
    Quote Originally Posted by Green Hulk
    Lets not concern ourselves with impressive boost numbers.

    Its volume of air that is more important.

    Also, 8400 RPMs is proven safe for the stock valvetrain.
    Jer, can you please explain that? You know the set-up I have, and being that I still have the GTX sc gearing, I`m not really seeing any impressive boost gains, how exactly does the Riva wheel enhance performance?...PR...

  8. #8
    Legend in my own mind Sirhc7897's Avatar
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    "Boost" is just a measure of backpressure (of course that's usually indicative of a greater volume of air being moved)...

    If a different supercharger impeller can move more air (or even the same amount) but make the compression of it "smoother" (so to speak) it will be a drastic improvement because:

    -The less chopped up and turbulent the air gets the better it will mix
    -the smoother the flow the less heat will be created

    You see where I'm going with this... It's not just about moving more air but also about improving efficiency.

  9. #9
    Site Admin Green Hulk's Avatar
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    The new Riva sc impeller looks identical to their old Vortech sc impeller, but it has taller blades. Hence the reason for the modified front housing.

    The taller the blades the more volume of air it moves.

  10. #10
    Chris: I have been told that the riva wheel is more efficient, what would be the best way to explain how I will feel the dif, is it accelleration?, top end? Both?...PR...

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