The International Harvester IDI (from Indirect Injection) engine is a 4-stroke V-8 Diesel engine used in International trucks and Ford F-Series pickups from 1982 to 1994. The engine had two displacements: 420 cubic inches (6.9 litres), which was used in Ford trucks from 1983 to 1987, and 444 cubic inches (7.3 litres), which was used in Ford trucks from 1987 to 1993 (naturally aspirated). The turbo charged version was to be a single year stopgap as production of the new Power Stroke engine was to debut with the 1994 model year. (turbocharged). Production of the 7.3 Turbo IDI engine was extended to mid-year 1994 as the new engine was not ready in time for a full 1994 model year run. The turbo 7.3 was very similar to the previous 6.9l and 7.3l IDI diesel engines. They differed in that the 7.3 IDI Turbo had different wrist pins, piston rings, as well as different flow capacity fuel injectors. Additionally, the fuel injection pump output was slightly increased to compensate for the additional air charge. This engine was replaced in mid 1994 by the Navistar T444E (7.3L) engine. The 6.9 IDI, 7.3 IDI, and 7.3 IDIT engines are not in the Power Stroke family. As of 1994 during the middle of the 1994 year modle production 7.3lt Diesel and 7.3lt Power Stroke Turbo Diesel became on option until the end of the 1994 year model production.
