I run a 1 litre catch can that is baffled and filled with steel wool. The catch can drains back to the sump.
Matty

Have you got a photo of how it runs back to the sump matty? That sounds like a good idea!

mildman the air is sticky oil filled air from your crankcase it gets all over your throttle body and i/c . the exhaust cam blows more oil coz the ca sits on a lean and the pick up is near the back

Cool that makes sense, thanks kegs.

Another piping question - the pipe in the nice diagram I posted earlier on this thread - one of the pipes says "To Crankcase (block)" - Does this pipe travel to the crankcase via the top of the oil pump?

It looks to me that the pipes make sense going down there.

what actually happens with track work is different to what you find on a street car that's thrashed a bit.

My GTR and Supra get 'trashed a bit" on the street and don't ever get oil in the inlet/intercooler without a catch can. Do a track day and you get oil in the inlet tract & intercooler. why?

because trackwork is done at sustained high rpm. More oil gets pumped to the head under these conditions and doesn't drain back to the sump quickly enough. it gets past the baffles and into the ventilation system.

for trackwork I'd avoid any setup that has a cam cover connect to PCV/plenum. You'll still get oil in the combustion mix but only under vacuum, not boost so risk of detonation from lowered octane is reduced. At least it keeps oil out of the intercooler - oil in the IC is bad because it acts as an insulator decreasing efficiency - you get hotter, lower octane oil contaminated air into the cylinders that way = increased risk of detonation.

for a street car - unless you have blowby you don't need a catch can.

What sort of setup do you have in your CA Harry?

Mildman - no photos I'm sorry but I hope this description helps.

Both cam cover outlets feed to a catch can mounted on the firewall in front of the passenger's side. The catch can has a small filter on top, baffles and steel wool inside. On the base of the catch can there is a fitting with an oil resistant hose that runs down past the turbo onto another fitting welded to the sump.

Matty

Oh yeah that makes sense - so you drilled a hole and welded another fitting to the side of the sump?

Quote:

The pipe to the block that the drawing is talking about is the one underneath your inlet manifold which is plumbed around the back of the inlet manifold and into the inlet rocker cover. It looks like it could be water because it's only about 100mm long then goes into a hard pipe but it's actually crankcase ventilation.