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The Terminator
Engine/Tuning
Smoking Issue on New Engine
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<blockquote data-quote="SlipperySnake" data-source="post: 16838340" data-attributes="member: 132229"><p>Oil control ring on these pistons does not intersect with the piston pin bore. Also ring flutter in my opinion would be related to sealing of the rings and they are sealing very well. Started another cylinder leak down last night didn't finish since Astros are in the world series, but i got 100psi in 99ish or so psi on cylinder side. I have to agree with the crank case pressure. With oil cap off there is no blow by or noticeable crank case pressure at idle, rings are sealing very well. So if there is no crankcase pressure I don't see how a PCV system at idle would serve for anything other than to scavenge the small amounts of blow by that are hardly noticeable in my case at idle. </p><p></p><p>Well ya vacuum at idle will do that in situations where the valve stem clearance of valve stem seals are bad, which is what I'm trying to figure out. But I put 50+ psi on the intake runner with intake valves closed and squirt oil all over that area with nothing. If there was an issue there you would see it in that test. 50 Psig is greater than intake manifold vacuum which at most would be measured as differential pressure at 14.7 Psia. </p><p></p><p>Me and my boss had a conversation just now about the PCV system again and he is set on the PCV system being the issue. I need a vacuum line running from the intake manifold or pre throttle body similar to any stock application. At idle the ambient pressure inside the crank case is being sucked into the combustion chamber via the back side of the rings, since it's creating a vacuum during the intake stroke. Pulling a vacuum on the crankcase would decrease the the differential pressure and prevent this. Regardless I'm still going to investigate the valve stem seals and probably change them just to eliminate that issue. I had the motor sitting for a while before ever even firing it up, like a year or so. Wondering if the seals could have loss their install lubrication or were never lubricated then when I started it up they were possibly damaged? Not sure on that idea but I'm thinking of some crazy shit at this point lol.</p></blockquote><p></p>
[QUOTE="SlipperySnake, post: 16838340, member: 132229"] Oil control ring on these pistons does not intersect with the piston pin bore. Also ring flutter in my opinion would be related to sealing of the rings and they are sealing very well. Started another cylinder leak down last night didn't finish since Astros are in the world series, but i got 100psi in 99ish or so psi on cylinder side. I have to agree with the crank case pressure. With oil cap off there is no blow by or noticeable crank case pressure at idle, rings are sealing very well. So if there is no crankcase pressure I don't see how a PCV system at idle would serve for anything other than to scavenge the small amounts of blow by that are hardly noticeable in my case at idle. Well ya vacuum at idle will do that in situations where the valve stem clearance of valve stem seals are bad, which is what I'm trying to figure out. But I put 50+ psi on the intake runner with intake valves closed and squirt oil all over that area with nothing. If there was an issue there you would see it in that test. 50 Psig is greater than intake manifold vacuum which at most would be measured as differential pressure at 14.7 Psia. Me and my boss had a conversation just now about the PCV system again and he is set on the PCV system being the issue. I need a vacuum line running from the intake manifold or pre throttle body similar to any stock application. At idle the ambient pressure inside the crank case is being sucked into the combustion chamber via the back side of the rings, since it's creating a vacuum during the intake stroke. Pulling a vacuum on the crankcase would decrease the the differential pressure and prevent this. Regardless I'm still going to investigate the valve stem seals and probably change them just to eliminate that issue. I had the motor sitting for a while before ever even firing it up, like a year or so. Wondering if the seals could have loss their install lubrication or were never lubricated then when I started it up they were possibly damaged? Not sure on that idea but I'm thinking of some crazy shit at this point lol. [/QUOTE]
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