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Location: Montrose, VIC
Registered: May 2002
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Re: Centrifugal supercharger BOV
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Wed, 09 April 2003 11:39
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This is simple stuff! With any kind of mechanically driven blower, whether you need a BOV(damn I hate that term!) depends on whether the blower is mounted before or after the throttle. If the throttle comes first, there's no way in hell you can use one - obvious and simple. I've seen wallies try and put them on 4AGZEs and wonder why the hell they don't work.
BUT if the blower comes BEFORE the throttle, you MUST have something, ESPECIALLY if it's a positive displacement type - this is because after the throttle shuts, the engine is still driving the blower, and it will build up enormous pressure in the inlet pipework, if you're lucky blowing off a hose or less lucky bending the throttle (with the appropriate results!)
Simple - a throttle before the blower (such as 4AGZE) cuts off the air, therefore there's no air to vent (otherwise the engine would still be going hard!).
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