Ah, Fajardo. Watch the reef north and south when you leave toward the East. Don't know the compression numbers for my engine, either. Ain't got that far yet. You may "just need rings," but that in itself is a pain.
As to replacement, check in PR for Yanmar, Beta, etc. The ONLY way you can get a Stateside price on Yanmar is stand in front of the dealer in the States, buy the engine, crate it and ship it to PR yourself. Highly protected dealerships, and, as I understand it, the Yanmar/Yamaha dealer for PR is in bed with the Yanmar/Yamaha dealer in the Virgin Islands. Ridiculous prices. I got in trouble with Mac Boring years ago for buying an engine in Maine and it was drop shipped to the V.I. to the DEALER. Who then wanted their markup. I went to pick it up and conflict ensued. I offered to drive my 3/4 ton Silverado through their warehouse doors and they promptly loaded the fully paid for engine into the back of the truck. Snickering something about "no warranty." I took photos of the install, which I did myself, and a dealer Stateside provided full warranty.
Call Parts and Power in Tortola for a better price on Yanmar. One of the Frenchie Fishermen on St. Thomas told me P&P was much cheaper than the St. Thomas dealer.
Or look at Beta. Don't know enough about Beta. Just a Kubota block, parts are cheaper, for sure.
Atmospheric pressure times the compression ratio MIGHT give you the "brand new" compression for the engine, but that would be 30.03 (atm press in Fajardo today) x 21.47 (engine), all divided by 1. That's over 600 psi. But you're asking the wrong guy, and that would undoubtedly vary with RPM.
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