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crank case venting problem w/ oiil vapor canister?
Ok
I have a 65 sideoiler, MR heads, solid lifter cam, Iron MR heads that have all been rebuilt (heads have bronze guides etc). I am running the pentroof valve covers (no vents) and I have the oil vapor canister on the firewall with 20w50 Brad Penn oil, and avaid 9qt pan. Now here is the problem, I think I have too much condensation building up. I also pulled the #1 plug yesterday and had some oil iin the threads which leads me to believe there is too much pressure buildup in the crankcase forcing oil and oil vapors past the rings and valve guides into the combustion chamber. I also get the occasional smoke burn out of the pipes as if il is pooling in the heads. When using the oil vapor canister system, are you supposed to remove the wire mesh backet/collector in the intake to allow better flow into the oil vapor canister thus relieaving some pressure in the system? Any thoughts? |
IMO....no, when you remove the hose\line going to the canister is there blow by coming out, can you feel positive pressure at the line? is there really excess blowby or are you getting too much oil up top? what rockers, what engine, how are you oiling the rockers?
fred ps, i'm assuming an FE engine |
RE: more info
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Yes it's an FE, a 1965 sideoiler and I am using Erson rockers in the MR heads. Can't get in there to check the pressure at the line but the clear hose I am using (from the block plate on the intake to the oil vapor canister) is discolored telling me I have something going through there. I also see vapor coming out of the upper driver side line (the line coming out the top of vapor canister and going back to the trans/differential). I also see some vapor and oil traveling out the canister and going back to the oil pan as designed, but not a lot. I see more water condensation in this line, but then again I am not on the road yet to allow the road draft tube assist with this either. What is conserning me the most is the smoke I am getting sometimes when I start up (even after I just ran it minutes ago) and the oil I found around the spark plug threads when I checked the plugs. I idle at right around 80lbs, shift around 100 and peg it when I really get into it. |
i have seen guys restricting the oiling to the rockers on the ersons. using plugs in the orfice in the head, bleed holes range between .06 to .09 depending on who you talk to, do you have them restricted?
i take it this is a newer engine, are the rings even seated yet? without being there it could be a combo of things, intake leaking sucking oil, getting the plugs wet. what valve seals are on it? you could do a compression test for peace of mind and to rule out the worst. |
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nothing wrong with paranoid, the oily plug is what would worry me the most, the canister hose would be a " watch for a while" intakes are notorious for leaking, took me a couple of times to get it right, you could be drawing a little oil in the intake runner from the bottom making the plug oily. i had to remove my intake and open up the pushrod holes to get enough clearance for the 3/8 pushrods, what intake gaskets are on it?
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Unlikely to building excessive crankcase pressure, but if it is you have excessive blowby. (ring end gaps, unseated rings, rings upside down or not fitted) A little early to panic, but I'd be talking to the engine builder. Quote:
What colour is this vapour? idle at 80lbs, shift at 100 - what does this mean? Quote:
11 miles of slow road testing is nothing compared to the load it would have seen on a dyno. |
You need a PCV valve on the motor
Dlotz D use should have a PCV valve on the motor. Some people like them at the back of there manifold where the breather is from the old days. I run mine in the r/s valve cover and have a vent in the L/S I also run high pressures and "G" turns. No smoke or oil being sucked up into the valve. I flood the heads for oil as well. My valve covers are the tall ones. The valve stem seals should be total seals. If you take off a cover and look betwwen the valve springs you should see a small wire going around the top of the seal. If not you may be running just unbrella seals that may cause you this problem. Is the oil on the spark plug threads inside or out side where it is placed? Are the plugs black and wet? Blue smoke is the sure way to know you have an oil burner or problem motor. You should have a port in the manifold or base of the carb. Get a piece of 3/8" rubber hose and run it from a port or carb to the valve cover. You might need to get a groment kit to put this on. Replaced the plugs and go for a good road test. Check motor after it has cooled off. This should relieve any pressure inthe motor for normal driving. Rick L.
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I have the same setup except I have breathers on each valve cover. My clear hoses are discolored and I do see some vapors occasionally. I also had the same issue with oil being pushed up through the threads on the spark plug and the smoke burn which ended up being a torn intake gasket that needed replacing.
Jason |
Something to keep in mind is the original 427 intakes also had a push on breather up front..
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My oil filler cap is a push on breather, and after running it tonight I could see some vapor coming out from the bottom. I don't have any breahers in the pentroof valve covers. |
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