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  1. #1

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    Supercharger blow off valve

    How many of u use a blow off valve? To me it seems like it would almost eliminate the need to have to rebuild your supercharger so often. I'm just putting it out there, I haven't seen much discussion on it.


  2. #2
    Eastside Powersports Slow 91's Avatar
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    there are tons of discussions about this...try searching.

  3. #3
    TDR's Avatar
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    There has been plenty of discussion on it. Running a bov on a seadoo supercharged motor will accully deteriorate the supercharger clutches quicker then running without one.

  4. #4
    boost junkie skidoochris's Avatar
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    It was not that long ago, I was asking the same question
    This is what I have found running a et70-145 all summer with no BOV
    These skis in any thing but smooth water are in and out so fast and so often
    I could see problems with a BOV and with the clutch set properly does not make too much heat or psi off throttle
    With the "small" boost most are running loosing all boost every few seconds using a bov
    IMO it would hurt performance

  5. #5
    boost junkie skidoochris's Avatar
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    this is the only app where loosing "traction" happens so often
    also some times the throttle does not close
    just rev limiter cut, how would the bov open?
    other times you just get big rpm changes
    I"m also still not buying that it will wear the clutches more
    Last edited by skidoochris; 10-31-2012 at 07:27 AM.

  6. #6

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    Thanks skidoochris, I've read a couple of discussions on it and I think a loss in performance (if your dropping too much pressure) is your biggest risk. But set up right would extend to sc life. BUT I need to read more on this to get the big picture.

  7. #7
    This has been debated to death, read up on it. The consensus is that they will shorten life of the SC, not extend it. Remember, the SC wheel acts as a flywheel, it resists fast changes in RPM due to inertia.

    Let's describe the classic situation where a BOV would come into play. You are at WOT, and quickly let off the throttle. The engine will spool down faster than the SC wheel can, so two things happen. 1. The pressure behind the throttle valve will increase rapidly. 2. The SC clutches will slip because the engine is slowing faster than the SC wheel can.

    If you use a BOV, you will vent the excess pressure that builds up. However, in terms of SC life, the excess pressure is helpful, since the backpressure acts as a brake to the SC wheel, which means less stress on the clutches. The backpressure is helping the SC stay in sync with the engine.

  8. +1 by:

    TDR

  9. #8
    Moderator Snoman's Avatar
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    read this thread,it has alot of useful information pertaining BOVs

    http://www.greenhulk.net/forums/show...sher+questions

  10. #9
    idoodou's Avatar
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    imho BOV is useless to extend life of SC, SC still needs to be rebuilt every 100hrs, nowdays it not the clutches you need to worry about, once they are set right their good to go, it is the bearings, they were never design to run 40k+ rpms, but no low cost bearing is

  11. #10
    sniper300's Avatar
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    A BOV will work on our Supercharged setups but it needs to be modded and setup for the amount of boost for it to work. I have not seen an off the shelf BOV that is suitable so far. I have modified a V Port to run with my Rude 3 in the ocean and after back to back testing my clutches last 3 times longer with the BOV campared to when i don"t run the BOV!! As for the bearings , They NEED OIL!!! At high rpm these things are starved of oil and the bearings get superhot !! Putting an oil feed into the housing is an easy mod which i have done and the bearings will love you for it!!!

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