All the notable upgrades that the DT466 diesel engine underwent produced a variety of horsepower. The original DT466 produced between 1973 and 1992 had a horsepower range between 145 and 260. This engine had a turbocharged variation, which produced the higher rating. From ’93 to ’96, Navistar manufactured the DT466P iteration of the engine, which produced between 175 and 230 horsepower and between 520 and 620 pound-feet of torque.
The last year Navistar built a mechanical fuel-injected DT466 was 1993. By the time 1994 strolled around, all iterations of the DT466 were built with an electronic fuel injector. Navistar improved the DT466P version and created the DT466E, giving it better injectors, a higher-pressure fuel system, and an electronic control system. These features allowed the engine to produce as little as 175 horsepower and as much as 300 horsepower with between 460 and 860 pound-feet of torque.
