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Reciprocating internal combustion engine
IDI
Valve cover sticker from International-Navistar AT190 7.3 liter turbo-diesel engine as installed in 1994 Ford F-350
Overview
Manufacturer
International Harvester (1982–1986) Navistar International (1987–1994)
Production
1982–1987 (6.9 L) 1986–1994 (7.3 L)
Layout
Configuration
90° V8
Displacement
420 cu in (6.9 L) 444 cu in (7.3 L)
Cylinder bore
4 in (101.6 mm) (6.9 L) 4.11 in (104.4 mm) (7.3 L)
Piston stroke
4.18 in (106.2 mm)
Cylinder block material
Iron
Cylinder head material
Iron
Valvetrain
OHV 2 valves x cyl.
Compression ratio
20.7:1 (1983 6.9 L) 21.5:1 (1984 & Later 6.9 L)
RPM range
Idle speed
675 (7.3 L)
Combustion
Turbocharger
Optional Single Wastegated, AR.82 Garrett T3 (1993–1994 Only)
Fuel system
Indirect injection
Management
Mechanical
Fuel type
Diesel
Oil system
10 US qt (9.5 L; 8.3 imp qt)
Cooling system
Water-cooled
Output
Power output
161 hp (120 kW) (1983),[1] later 170 hp (127 kW) @ 3,300 RPM (6.9 L)[2] 185 hp (138 kW) @ 3,000 RPM (7.3 L) 190 hp (142 kW) @ 3,000 RPM (7.3 L turbo)
The International Harvester IDI (from Indirect Injection) engine is a four-stroke diesel V8 engine used in International Harvester school buses, trucks, Ford F-Series pickups, and Ford E-Series vans from the 1983 to 1994 model years. The engine was built in two displacements: 420 cubic inches (6.9 L), which was used in Ford trucks from 1983 until 1987, and 444 cubic inches (7.3 L), which was used in Ford trucks from 1988 until 1994 (naturally aspirated) and in 1993 and 1994 (turbocharged).
During 1994 production, the IDI engine was replaced by the Navistar T444E engine, sharing only the displacement with the IDI. The T444E was the first engine marketed under the Ford Power Stroke name.
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IDI