Small Query

I am taking about the two ones which are on the inlet manifold.... they are already blocked at my end , by putting a small rubber hose with a big screw infront ..
 

TurboDave

Member +
Its a pretty simple one, as standard the pcv valve only allows the engine to breath through it when not on boost and since there is a vacuum in the inlet manifold it draws waste gas from the crankcase. When you create boost the valve closes to prevent boost pressure from pressurising your crankcase. The other breather on the rocker cover is normally connected to the turbo inlet pipe meaning it can vent crankcase gas at all times but when boost is created and the pcv valve closes the turbo is then sucking air through the induction piping and resultantly also sucking exhaust gasses out of breather no2 and the crankcase.

When you fit a relocation kit and the intake is standard no more you dont have the draw on breather no2 as boost is created, if you block up the stump on the inlet (well to stop it leaking boost) and then gut the pcv valve and vent it to atmosphere you end up having a breather system which when under boost can breath through both breathers when on boost (when its most needed).

Due to you running more boost you will have more crankcase pressure due to blow by on the rings, increased piston speeds on spool etc so you will probably be better off running the pcv gutted and vented to atmosphere as above.

Its great when people jump on the band wagon when the guys logic is actually correct (if thats what he means could have been lost in translation)!
 
Top