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Engine analysis needed here ....
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Posted by Way Up Here on May 26, 2006 at 06:25:47 from (64.42.242.12):
OK, here's my situation. I have a 4-cylinder Continental flathead 124 cid engine in a MH model 20 which blows a lot of blue smoke when it gets warm, especially when you rev the engine up quickly. The compression reads between 100 & 110 pounds so that seems OK. Tearing the engine down showed me exhaust valves in very good shape (carboned up underneath the valve head) and the intake valves have a ridge pounded into their circumference near the bottom where they contact the bottom edge of the seat. They were also carboned up underneath somewhat. The valve guides (intake and exhaust) are quite slopppy. I have no idea what condition the rings or cylinder bores are in but the bores look clean and unscored haven't torn that apart yet (if I do that at all) but there is almost no wear ridge on the top of the cylinder bores. Tops of the pistons are relatively clean with just a bit of carbon and oily residue. My question is .... what is causing the engine to blow the oily smoke?
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Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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