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Clear the smoke
- Thread starter abarth69
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RonMacPherson
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Depends....
Was the engine hot, or at least warm when you did the compression test?
Were all four plugs removed when checking compression? Was the throttle opened(jammed full open) when cranking the engine? Did you crank the same number of revolutions for each cylinder(6-8)? How much oil was added? Should be appx. 1 tablespoon or three or less squirts with the old time engineer oil can.
If the engine was cold and lots of oil I would not condemn the rings without further diagnosis.
Either a cylinder leakage test, which can pinpoint combustion pressure leakage, or get a can of GM top end cleaner. with the engine running suck it through the carburetor, at a high idle, intermittently revving the engine to 2-3K range to inhale the top end cleaner without hydrolocking the engine. After the can is completely empty, let it sit overnight. Start it up the next morning, prepared for LOTS of smoke from the exhaust. Then go for a drive to get it warm and recheck your compression...
Was the engine hot, or at least warm when you did the compression test?
Were all four plugs removed when checking compression? Was the throttle opened(jammed full open) when cranking the engine? Did you crank the same number of revolutions for each cylinder(6-8)? How much oil was added? Should be appx. 1 tablespoon or three or less squirts with the old time engineer oil can.
If the engine was cold and lots of oil I would not condemn the rings without further diagnosis.
Either a cylinder leakage test, which can pinpoint combustion pressure leakage, or get a can of GM top end cleaner. with the engine running suck it through the carburetor, at a high idle, intermittently revving the engine to 2-3K range to inhale the top end cleaner without hydrolocking the engine. After the can is completely empty, let it sit overnight. Start it up the next morning, prepared for LOTS of smoke from the exhaust. Then go for a drive to get it warm and recheck your compression...
OP
abarth69
Jedi Warrior
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Stone Cold
All the plugs out foot on throttle opened 6-8 turns and a couple of squirts.
Just can not get over the fact we went from not to bad to really bad in such a short time. Pulling the engine and doing a rebuild was not in the cards this winter.
Come hexx or high water I must finish my 1959 Fiat Abarth Double Bubble it's only been in the works since 1980. Next year I want to troll for some of those Bugeye's
Cheers
Mark
All the plugs out foot on throttle opened 6-8 turns and a couple of squirts.
Just can not get over the fact we went from not to bad to really bad in such a short time. Pulling the engine and doing a rebuild was not in the cards this winter.
Come hexx or high water I must finish my 1959 Fiat Abarth Double Bubble it's only been in the works since 1980. Next year I want to troll for some of those Bugeye's
Cheers
Mark
R
RonMacPherson
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That's why I recommend the GM top end cleaner. It may just be carbon buildup on the rings. And it's a lot cheaper diagnosis tool, possible problem resolution than having to tear the whole thing apart.
tosoutherncars
Jedi Knight
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I'll apologize in advance for the silly questions...
It is grey-blue smoke you're seeing?
It was asked earlier, but I'm not sure whether the answer has come out. Is it smoking most noticeably on accelleration? Or on the overrun (engine braking)?
It is grey-blue smoke you're seeing?
It was asked earlier, but I'm not sure whether the answer has come out. Is it smoking most noticeably on accelleration? Or on the overrun (engine braking)?
startech47
Jedi Knight
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A bad oil ring will not affect the compression readings.
tosoutherncars
Jedi Knight
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Back to Bill's original question... you're sure your PVC system is OK?
jhorton3
Jedi Warrior
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It could be oil vapor being sucked into the intake through a malfunctioning PCV system. From my experience though it takes a little while for the oil to warm up and atomize, then it gets sucked in and causes the fog. If it's happening right from start up it could be the seals on the valves have perished.