Hi all,

 

I'm having some extra work done while the car is in the garage.

I have been looking into fitting an oil catch tank and relocating the PCV's to the rockers to stop the car smoking on hard cornering.

 

Does anyone on here with larger turbo's have any problems with crank case pressure at high boost?

This would be the only reason I would fit the oil catch tank to eliminate the crank pressure as the other problem with smoking would be solved by the relocation of the PCV's from what I've read. I hear stories of the oil dip stick flying out at high boost as well as high crank case pressure being a major problem.

 

Does anyone else have any other solutions?

 

Cheers Dan

Surely you would only get positive crank case pressure if you are getting large amounts of blow by through worn piston rings, i was running 18 psi, but with the cooler weather, it went to 21 then when it got really chilly, it was at 24psi, never had my dip stick pop out and thats with the normal PCV valves in their original location.

As above really. You shouldn't get positive crankcase pressure from boost, at all. If the PCV should be forced closed even harder with more boost.

Also the positive side parasitically pulls on the negative side of the induction circuit. Ie blow by is sucked through the top cam cover vents when on boost rather than pulled in as when on vacumme.

bad piston rings or duff pcv valves can give you positive pressure in the crank case ...

 

now removing the Pcv system will help stopping Oil returning back in to the intake side and Boost pressure leaking bk in to the engine ...

Vented oil catch tank will help with the engine breathing system .. but if you have bad rings and getting blow by it can mask the problem untill they fail completely

Or the deletion of the PCV can decrease the scavenging potential, thereby increasing pressure or rather reducing negative pressure to show symptoms not previously noticed. Although this is a new build so neither of this things should be a factor.