Re: Chrysler 115HP - Estimated Speed
Compression testing hose and gauge---about 20 bucks in the auto stores. Screws right into spark plug hole.
Brand new, readings were up around 140 PSI. (125-145) If you get 120-125, you will probably be doing OK. BUT: Quality of gauges varies so your readings may not be actual and may be low. The important thing is that all cylinders be within 10 pounds of each other. Trouble is when you get 120, 120 125, 50. Then you know one piston has issues.
I noticed your locale is Colorado. I forgot to mention in the last post: If you are boating around Mile High City, then be sure the engine carburetors are properly jetted for altitude. And if you are at altitude, the engine will produce less horsepower, usually swinging less pitch on the prop, thus, less speed