Horsepower in a 3.9 Isuzu Diesel

by Manny Jeter
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diesel image by Martina Berg from

Isuzu is well known for its diesel engines and trucks. The vehicles are designed to provide power and durability with a small displacement. The Isuzu's small displacement gives the diesel engines better fuel efficiency than many diesel competitors.


The original, 3.9 Liter Isuzu diesel was also known as the 4BD1T. It was produced from 1985 to 1992. The turbo-charged, four-cylinder diesel engine had a peak performance of 120 to 128 horsepower, and a peak torque of 250 foot-pounds. The engine had a redline of 3,500 rpm.


The 4BD2TC diesel was produced by Isuzu from 1992 to 1998. The diesel engine used an intercooler, and had a peak of 135 horsepower.

Engine Dimensions

Both diesel engines had four cylinders, and a bore/stroke of 4.0 to 4.6 inches. The engines had a compression ratio of 16.5-to-1, and a turbocharged aspiration. The engines had a weight of 750 lbs., and a displacement of 238 cubic inches.

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