
03-19-2014, 07:53 PM
|
 |
CC Member
|
|
|
Join Date: Jan 2001
Location: Sunbury,
VIC
Cobra Make, Engine: Rat Rod Racer, LS1 & T56
Posts: 5,391
|
|
Not Ranked
The PCV does need vacuum to pull it open or some positive pressure on the underside to push it open. They are a 1 way check valve that usually has a light weight spring to keep them closed or are oriented so that gravity keeps it closed.
Cheers
__________________
Mike Murphy
Melbourne Australia
|