So today I noticed something curious when pressurising the intake, the cam cover is also pressurising (the vent hose from the throttle body to the cam cover is disconnected). Roughly I have around half the boost pressure building in the cam cover, i.e. if I pressurise the intake to 18psi, i see 9psi in the cam cover. When pressure is removed then the intake pressure decreases first and the cam cover pressure does not decrease until the intake pressure reaches the same level.
This doesn't seem right to me, but wondering if anybody has ever noticed something similar ?
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Originally Posted by Martin F
