Compression pressure depends on a lot of variables including head style, piston head design as well as wear. A C113 engine to have 102psi would have to have a 6.9 compression ratio which is possible for a factory original gas C113; i.e step head pistons with a gas head. That is 100% efficiency for a 6.9 CR. To estimate what a compression test reading should be, multiply the compression ratio for the engine as equipped (piston design and head)by 14.7 psi which is one atmosphere pressure and then multiply by about 90%. If I remember correctly, the old distillate engines had compression ratios less than 5 to 1. That would put the expected compression reading to be below 70 psi and that engine will run like a top.
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Today's Featured Article - The Great Escape - by Dave Hollrah. It all began Monday with a little baling of second crop on the lake shore field, and as I drove out past my sister and her hubby's place, this small calling sound could be heard from the general direction of their manure pile. Out of the yard, over the cows and bale piles, through the dozer piles, poplars, and brush, out onto the ditch grade road, past the noisy 6.2 diesel engine pulling my well traveled Suburban along. Well it sure didn't take me long to figure out what it was because I alrea
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