Cummins Make Light Oil Engine
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A FOUR-CYLINDERED 44--litre (267rk cu.-in.) oil engine has been introduced by the Cummins Engine Co., inc., Columbus, Indiana, U.S.A. It represents an attempt to compete against petrol units to provide power for a wide range of vehicles and industrial equipment for which oil engines have not so far been adopted in America.
The engine is made in two forms—the 170 developing 70 b.h.p. at 2,000 r.p.m. and the J80 producing 80 b.h.p. at 2,500 r.p.m. Otherwise the specification is common to both, with 4*-in, bore and 5-in, stroke, five main bearings of 31-in. diameter, big-end journals of 21-in. diameter, and 11-in.-diameter gudgeon pins. It is stated that the bearing area is the largest of any current production oil engine of comparable size.