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Here are somestats on it.
In use from 1915 to 1970 in the oil fields of Northwest Pennsylvania as a natural gas pipeline compressor. 140 tons total weight, 67 feet long, speed 80 to 90 r.p.m., flywheel 27 tons and 18 feet diameter, crankshaft 12 tons and 16" diameter, bore 24", stroke 48", 39,600 cubic inches displacement! Two clinders in line with combustion on both sides of both pistons.
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The antique tractor club I belong to in FL has a very similar one (same manufacturer) but a little smaller. I wish that video had the sound of the exhaust- it sounds like a dragon breathing! I'd like to know how those guys know how to restore something like that- ours was all apart when it arrived from PA.