H.P.A.T.E.E.M Tractor Show: John Deere 820 With a 7.7 Liter Two Cylinder Engine

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The John Deere 820, sold from 1956 through 1958, is powered by a 7.7 liter diesel engine. That works out to 470 cubic inches, and all those cubic inches are displaced by just two pistons. With a long stroke of 8 inches and a bore of 6.125″, it can properly be described as undersquare, definitely not for revving high, but capable of great gobs of torque. As you can imagine, it takes some power to get an engine like that started and the John Deere 820 has a four cylinder gasoline “pony” engine that’s used just to start the main diesel motor, as you can see in the video below.

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