Re: Possible valve noise

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Posted by Bruce(OR) on September 06, 2020 at 21:17:21 [URL] [DELETE] :

In Reply to: Re: Possible valve noise posted by Tlawing on September 06, 2020 at 18:18:26:

Not a mechanic can be a good thing. Your brain doesn't overwork itself and you pass up the obvious.
You did a dry cold test. The numbers you have indicate enough "umph" to make it fire.
Warm engine will bring the numbers up, a wet test is simply adding about a tablespoon of oil to the cylinders and that helps to seal the rings and raise the comp numbers.
A good engine will see very little rise in the comp numbers on a warm engine. A cold engine should raise them higher. A worn engine can see a 20 PSI increase in comp numbers. Generally that is also accompanied by smoke while running due to the rings/cylinder being worn out.
Your flat head engine has the valves in the block and adding oil into the plug holes should help those to seal also.
Generally weak valves can be found with a fluctuating vacuum gauge. Hooking up a vacuum gauge to your engine might be possible IF your manifold has a screw in the side of it for utilizing a vacuum operated milking machine.
Chances are you have no screw or it is absolutely frozen in the manifold.
Valves during a comp check are either open or closed.
Open valves will not build compression.
Your first post sounded like you got it running. Now it appears to not be running.
Valve adjustment is for the valve to spend enough time seated to dissipate the heat during engine operation. A tight valve will not stay seated long enough to dissipate heat and will burn the edges of the valve soon enough.
A loose valve will do a good job of dissipating heat but will be noisy in the process and the engine performance will suffer due to the valve not fully opening.
So, is it running or not?

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