How much is to much compression?
#1
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How much is to much compression?
I've read quite a few times on here that the best way to check compression is with a leak down tester, unfortunately I don't have one at this time. My question is how much compression is to much on a small engine on a riding lawn mower. The one that I am working on now is a 16hp Briggs Vanguard 303777-1114-E1 that's reading 160 psi on one cylinder and 170 psi on the other, which seems to be a lot higher than I've seen.
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It starts pretty normal actually. The only issue is when pushing the throttle from idle to full throttle there's just a bit of black smoke from the exhaust just for a second.
#4
That's fairly normal for that engine. I'd adjust the valves and use it. Those engines are top of the line... you won't find much anything better.
#6
Turn the engine to TDC on the compression stroke, then 1/4" past tdc and set the valves on that cylinder to .005" with a feeler gauge. Repeat with the other cylinder as well.