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Engine BOV's Question

Discussion in 'Powertrain' started by Coryolla, Jul 11, 2004.

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    Coryolla Guest

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    BOV's Question

    Ok me and my friend are arguing about BOVs on superchargers... I said it doesnt need it... he says he heard it, i told him it was a turbo. So can somebody verify?
    Coryolla, Jul 11, 2004
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    CadetLee Guest

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    Superchargers are belt-driven and run at a constant pressure, afaik..so no BOV.

    I'm no expert, though. =)
    CadetLee, Jul 11, 2004
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    vortex Well-Known Member

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    third that
    vortex, Jul 11, 2004
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    turbo4age Love to Hate me

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    the superchargers that dont need/have BOVs typically have the throttlebody placed before the supercharger unit, thus there is no way for air to back up into the blades. i.e. roots/twinscrew/whipple that mount directly to, or replace, the intake manifold..... similar to the trd one for the corollas

    a centrifugal is basically a belt driven turbo and mounts before the throttle body, therefore when the throttle is closed the pressurized air in the charge pipes needs somewhere to go........ BOV
    turbo4age, Jul 11, 2004
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    JspeXAE102 Well-Known Member

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    I believe turbo4age said it best,
    but i was thinking since the engine revs slows down after the throttle is close, there may be no need for a bov... but then again same could be said for turbos so tuche
    JspeXAE102, Jul 11, 2004
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    Turbo4afe Guest

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    what jspexae102 said..
    Turbo4afe, Jul 11, 2004
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    slvr2000fdvspec Guest

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    some superchargers have bov's..i heard them before..unless i was dreaming
    slvr2000fdvspec, Jul 11, 2004
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    JspeXAE102 Well-Known Member

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    it depends on the supercharger, it is quite possible to put a bov on a centrafuge type since there are charge pipes leading up to the throttle body, and it would "blow off" when you let go of the throttle at high RPM's.. but rather or not they're needed is questionable
    JspeXAE102, Jul 11, 2004
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    XS PSI New Member

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    yea what turbo4age said...
    XS PSI, Jul 12, 2004
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    Coryolla Guest

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    ok so its a possibility?... but not exactly needed...
    Coryolla, Jul 13, 2004
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    Concordmk1 Guest

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    ditto, possible, but essentially pointless
    Concordmk1, Jul 14, 2004
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    Turbo4afe Guest

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    its only possible in a belt driven one, that has thorttle pipes...
    its impossible to have one at a supercharger that mounts on the intake manifold like the 4agze.
    Turbo4afe, Jul 14, 2004
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    turbo4age Love to Hate me

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    so i take it nobody read my post?
    turbo4age, Jul 14, 2004
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    superpilun Guest

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    even so BOV's are not technically required even on turbocharged vehicles. whether or not compressor surge is bad is debatable.
    superpilun, Jul 17, 2004
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    turbo4age Love to Hate me

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    turbo4age, Jul 17, 2004
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    thespud Guest

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    BOV's on superchargers are a possibility, and may be needed in some cases... for example in a twincharged situation, when the turbo spools, it opens the BOV, to reduce backlash and mechanical drag, but these are usually only required on centrifugal types..
    thespud, Jul 18, 2004
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    turbo4age Love to Hate me

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    reading is fun
    turbo4age, Jul 18, 2004
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    thespud Guest

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    I did read that... i was just clarifying...
    thespud, Jul 18, 2004
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