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Old May 1, 2008, 11:09 AM   #14
Boltz.
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Join Date: Aug 2005
Location: St. Charles, IL
Posts: 1,483

Drives: Evo8

Based on looking at the desing of this blowoff valve it looks (this is a generalization) like a standard blow off valve that is used backwards with a second sealed chamber for the piston and modded vacuum nipples for the reverse design.

Just by looking at the CAD photos, It looks like it would remain open under vacuum. Is there a spring in this BOV? What prevents it from opening under vac?
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