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Thread: Clutch ?

  1. #1
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    Clutch ?

    Do we really need a clutch ? Why cant u just have it just straight gear driven with out clutch ?


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    Addicted Member 5001craig's Avatar
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    I would think it would be impossible to keep a shaft together without a clutch--too much inertia spinning even when shutting off the motor at idle.

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    SHOBiz's Avatar
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    Quote Originally Posted by 5001craig View Post
    I would think it would be impossible to keep a shaft together without a clutch--too much inertia spinning even when shutting off the motor at idle.

    Indeed, even at idle the SC is spinning around 16,000 (~1,600 idle on my MoTec x 10). Damn...
    Imagine the stress placed on the SC going from 16,000 rpm to zero rpm as quickly as the motor stops. Snap.

    I can't help but think that if this whole SC was larger - bigger shaft, bearings, wheel, etc...and lower spin speed - this would not be as big of an issue.

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    Having Fun jp1300r's Avatar
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    Quote Originally Posted by 5001craig View Post
    I would think it would be impossible to keep a shaft together without a clutch--too much inertia spinning even when shutting off the motor at idle.
    ?

    [QUOTE=SHOBiz;1498352]Indeed, even at idle the SC is spinning around 16,000 (~1,600 idle on my MoTec x 10). Damn...
    Imagine the stress placed on the SC going from 16,000 rpm to zero rpm as quickly as the motor stops. Snap.

    Something to think about for sure. SD SCer spins 5:1, idles at 1600-1800, and the SCer impeller is about twice as big in diameter as a Yami one. Yet, they don't seems to feel the need for it to freewheel upon shut off. With the slip we run on a SD SCer, I am sure it stops when the engine stops.

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    Taking money away from the Z06 Fund
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    [QUOTE=jp1300r;1498459]?

    Quote Originally Posted by SHOBiz View Post
    Indeed, even at idle the SC is spinning around 16,000 (~1,600 idle on my MoTec x 10). Damn...
    Imagine the stress placed on the SC going from 16,000 rpm to zero rpm as quickly as the motor stops. Snap.

    Something to think about for sure. SD SCer spins 5:1, idles at 1600-1800, and the SCer impeller is about twice as big in diameter as a Yami one. Yet, they don't seems to feel the need for it to freewheel upon shut off. With the slip we run on a SD SCer, I am sure it stops when the engine stops.
    +1 here. The higher the "step up" ratio, the better, less slippage, more efficiency on the blower and better rpms. Most Car Votech blowers only run a 4.44 to 1 or something like that on the step up ratio. Procharger has run a 5 to 1 step up ratio or higher, so most prochargers are more efficient blowers.

    A larger diameter impeller would also allow us to run higher Boost #s at a lower rpm. I think I've said it 100 times here before, but I'd love to see what a company like Procharger or Vortech could do with a SC Unit for the SHO/FZ motors. Leave HKS to make BOV's and Fart cans.

  6. #6
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by onebadsho View Post
    Do we really need a clutch ? Why cant u just have it just straight gear driven with out clutch ?
    It will break all the teeth on the gears or snap a shaft to much inertia.

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    abracadabra's Avatar
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    Thumbs up Is this right?

    Quote Originally Posted by JIM'S PERFORMANCE View Post
    It will break all the teeth on the gears or snap a shaft to much inertia.


    So it can go from 16K to 80k with out it braking but it can't go the other way around from 16K to 0????

  8. #8
    SHOBiz's Avatar
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    Quote Originally Posted by abracadabra View Post
    So it can go from 16K to 80k with out it braking but it can't go the other way around from 16K to 0????

    But there is a moment when going from 80k (or even 90k) to say 50k where the clutch is still holding but having force applied to do otherwise, That is at least one of the issues IMO. It needs that ability to slip somewhat like the SD chargers do with washers.

    From idle or even a rolling start the clutch is already engaged and doing fine.
    Running along and going up and down in rpm the clutch is bouncing between engaged and free. That's a clutch killer.

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    Whats up julio a meet you at kissime river in march i have a fzr like elias im ready for you wend are we going to race

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