blowing oil out the valve cover breather ports
#1
Senior Member
Thread Starter
iTrader: (9)
Join Date: Jun 2007
Location: NH
Posts: 1,013
Total Cats: 21
blowing oil out the valve cover breather ports
I asked in my build thread, but haven't gotten much of a response, so I figured I would start a new thread.
I have a new fully built motor that is blowing a significant amount of oil out the valve cover breather ports ( went for a 4 hour drive and my once empty catch can was overflowing). The engine was broken in on the dyno, and has approximately 4 tanks of fuel run through it. I am running a 323 GTX pcv valve on the intake side. Here's a current pic of how the lines are routed to my catch can:
the motor was built by a race shop with all new components, and the head and block were checked for cracks. It has an OEM headgasket. The baffles in the valve cover are all in place, and I sealed them with rtv upon installation.
I did a compression test and got 218-218-220-220 (cyl 1-4) on a warm engine (I have low comp. pistons and mild cams). The car doesn't smoke, it's making good power, it's not overheating, and oil pressure and temperature are normal.
Does anyone have any other ideas as to what the cause might be?
I have a new fully built motor that is blowing a significant amount of oil out the valve cover breather ports ( went for a 4 hour drive and my once empty catch can was overflowing). The engine was broken in on the dyno, and has approximately 4 tanks of fuel run through it. I am running a 323 GTX pcv valve on the intake side. Here's a current pic of how the lines are routed to my catch can:
the motor was built by a race shop with all new components, and the head and block were checked for cracks. It has an OEM headgasket. The baffles in the valve cover are all in place, and I sealed them with rtv upon installation.
I did a compression test and got 218-218-220-220 (cyl 1-4) on a warm engine (I have low comp. pistons and mild cams). The car doesn't smoke, it's making good power, it's not overheating, and oil pressure and temperature are normal.
Does anyone have any other ideas as to what the cause might be?
#4
Tour de Franzia
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
Pull off that valve cover and have a look for yourself. Plug that port and see what happens, I'm testing the same thing with one pick-up on the driver's side this weekend.
If the piston/ring seal is bad a leak-down test will indicate this failure. Bad valve guide seals are still a guess but unlikely if you're not burning oil..."unlikely" is not absolute.
#8
Senior Member
Thread Starter
iTrader: (9)
Join Date: Jun 2007
Location: NH
Posts: 1,013
Total Cats: 21
with the pcv in place (like in the pic), from the looks of the lines it seems the majority of oil was coming from the driver's side port anyways, so I don't think your theory is 100% for this situation
#13
I did, but do you not think there might be any difference if the valve cover has vacuum on it rather than the positive crank case pressure coming up? It has been a minute since I have seen the underside of the valvecover and where the passages are.
Oh **** it. Fill both holes and put fittings on TOP of the baffles...coming straight up out of the VC. That should sove any sloshing problems
Oh **** it. Fill both holes and put fittings on TOP of the baffles...coming straight up out of the VC. That should sove any sloshing problems
#19
Tour de Franzia
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
I had good results yesterday. I'm making cappuccino in the can bust still blowing a very small amount of oil THROUGH the filter. I didn't have to add oil all day but I'm going to stuff some steel wool in the neck of the can to hopefully catch that oil.