Posted by Jerry/MT on July 04, 2010 at 14:55:01 from (206.183.116.129):
In Reply to: Compression posted by Two Banger on July 04, 2010 at 12:13:59:
It depends on what the compression ratio is supposed to be. A lot of the gas tractors of this era had a 6:1 or 6.5 :1 compression ratio. That would mean that a new engine would be in the range of 125-140 psi and a the lower limit is on the order 0f 90 psi. really low compression pressures indicate valve problems. You have to run a compression test corrctly to get good numbers. the engine should be at operating temperature and the throttle plate should be wide open and the air cleaner disconnected. It"s easier on the starter if all the spark plugs are removed. Affter checking the compression dry on all cylinders, add a couple of ounces of motor oil to each cylinder and repeat. Record both sets of numbers. then get back here with the results.
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