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In 1941, Minneapolis-Moline introduced a liquefied petroleum gas (LP-gas) engine for its model U series tractors and was the "first tractor manufacturer" to do so. The 4-cylinder, 283-cubic-inch LP-gas engine with a rated speed of 1,275 rpm was built with the same 4.25-inch bore and 5.00-inch stroke as the gasoline engine. However, the compression ration was 6.8 to 1, instead of 5.4 to 1 for the gasoline engine. The Minneapolis-Moline engines were unique with the cylinders and heads cast in pairs and attached to the crankcase by studs.
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