Engine Cylinder Compression=0
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,404
Likes: 418
From: Chester Virginia
Engine Cylinder Compression=0
Checked all the cylinders tonight on my engine, 1973 L-82, and all read 150 except #4 which read 0. How do you tell if the piston rings are bad or a valve is bad? The spark plug was dry and not covered in oil, so I figure the rings are good and a valve is bad - right? What other tests should I do to confirm the failure?
At this point I am considering a different set of heads, nothing wild or radical, but something almost stock, but with the 65-67 cc combustion chamber to replace the stock 76cc chamber heads. Any suggestions on different heads, maybe an old set of GM heads? Your opinions are welcomed. Also where might I get the replacement heads?
Roger
At this point I am considering a different set of heads, nothing wild or radical, but something almost stock, but with the 65-67 cc combustion chamber to replace the stock 76cc chamber heads. Any suggestions on different heads, maybe an old set of GM heads? Your opinions are welcomed. Also where might I get the replacement heads?
Roger
Drifting
Joined: Oct 2004
Posts: 1,259
Likes: 7
From: Ontario
Originally Posted by RMS73
Checked all the cylinders tonight on my engine, 1973 L-82, and all read 150 except #4 which read 0. How do you tell if the piston rings are bad or a valve is bad? The spark plug was dry and not covered in oil, so I figure the rings are good and a valve is bad - right? What other tests should I do to confirm the failure?
At this point I am considering a different set of heads, nothing wild or radical, but something almost stock, but with the 65-67 cc combustion chamber to replace the stock 76cc chamber heads. Any suggestions on different heads, maybe an old set of GM heads? Your opinions are welcomed. Also where might I get the replacement heads?
Roger
At this point I am considering a different set of heads, nothing wild or radical, but something almost stock, but with the 65-67 cc combustion chamber to replace the stock 76cc chamber heads. Any suggestions on different heads, maybe an old set of GM heads? Your opinions are welcomed. Also where might I get the replacement heads?
Roger
Racer
Joined: Aug 2000
Posts: 488
Likes: 0
From: Fremont,CA
To test if it's rings you put 30 wt oil in the cylinder thru the spark plug hole and if the compression goes up during the test, then it is the rings. I assume you pulled all of the plugs and held the throttle wide open for the test....You could have a stuck valve but you would hear a loud "click" when the engine is running. A broken valve spring would result is a rough idle...Good luck!
