I have oil coming out my breather filter on my BR catch can. What can cause this? I have googled and searched and can't find an answer. Could this be my rings or valves? Has any one else had this happen to them? The build doesn't even have that many miles on it. I thought I had a blown head gasket but I changed it and the compression is still the same as before. And after doing the change there is still oil coming out the breather filter.

 

what way is the catch can piped

 

sounds like poor ring seal. who built the engine?

 

Todd6027 - it is to the valve cover and goes back into the dip stick tube.

94awdcoupe - it is a BR 2.4LR put in by AWD Motorsports.

 

Inside the crankcase and head oil sprays everywhere, becoming a mist. There are baffles in the valve cover to separate oil from air. A catch can is used to just do more of the same.

A built engine with looser parts than stock may have more blowby which will move more of this oil mist out of the engine.

 

+1 on this... For the OP Yeah I had this same issue bro. It just happens with the BR catch cans; and even more so if you still have the stock balance shafts inside your built motor. I believe Buschur's can only have one small baffle on the inside. And with all the oil blow by comin from the motor in the direction of the can the oil is pushed out so fast it has no where to go but up. Now, I realize those cans have been designed to redirect the oil back into the motor but the fact of the matter is there was nothing put in place to physically redirect the oil. The cans are hollow inside. So when that hot air/oil comes screaming out under pressure the path of least resistance ends up being straight up and unfortunately that lil K&N breather filter is not going to keep oil from puke'n all down the side and the back of your motor my friend. IMHO for your particular setup you're gonna have to upgrade to a better mouse trap.

 

no matter how good the catch can it, you are going to have some oil coming out of the breather filter.

 

do a leak down test see what if anything that shows , personally i dont like that piping set up .

id put 2 x 1/2 inch fittings in the rocker cover and get rid of the pcv if its still there , both pipes to catch can presuming it has 2 connections plus the filter

 

I don't have the PCV. I have a single straight nipple. Forgot who I got it from. Who has a good mouse trap set up? Post a link to it.

 

Do a leakdown if your still getting 120 psi on two cylinders something isn't right.

It doesn't even have to be a true leakdown. Put air to your two low cylinders and figure out where air is even coming from.

Do it hot!!! If its coming from the valve cover cap its your rings, radiator bubbles would be headgasket, intake valves would make sound in the intake or best way is to remove bov and listen there, exhaust valves from the rear end.

If you have massive amounts of blow-by your catch can is the least of your worries.

 

+2 ^^^^^^ on this too. If you are having other issues inside your motor a better mouse trap will only vield you minimal win. I actually came across mine on accident when I was in a buddys shop and he just happened to be upgrading a catch can for one of those ZO6 twin turbo Vette kits he was working on. That whole one mas trash thing I guess. I will attempt to find you a link to where he got it from.