Re: BPV's and the noise they make - Saab Performance Bulletin Board - Saabnet.com
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Re: BPV's and the noise they make
Posted by Greg Netzner (more from Greg Netzner) on Wed, 12 Mar 2003 20:15:21
In Reply to: BPV's and the noise they make, jared, Wed, 12 Mar 2003 13:34:58
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Some are designed as "hybrid" BPV/BOVs, where some of the air is vented outside the valve while the rest is returned to the air path. Still others are marketed as either/or concepts, where you can either hook it up as designed, or run it "unattached" to get it to vent to atmosphere. (Obviously, you can do this with any BPV, even the stock Bosch valve.)
It may also be the orientation of an aftermarket valve. For some of the aluminum valves, the shape of the piston can alter the sound it makes. So, if you run it with pressure to side port it will sound different (quieter?) than if you run it with pressure to bottom port (louder?).
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