Toyota H engine

The Toyota H engine was first produced in 1967 but did not reach road cars till 1972. It is not a successor to the older and larger Toyota D engine.

H engine was then replaced by the 2H engine and the 12H-T turbo engine. It was succeeded by the more advanced SOHC HZ series engine.

Toyota H engine
Overview
ManufacturerToyota Motor Company
Production1967-1990
Layout
ConfigurationStraight-6
Displacement3.6 L (3,576 cc)
4.0 L (3,980 cc)
Cylinder bore88 mm (3.46 in)
91 mm (3.58 in)
Piston stroke98 mm (3.86 in)
102 mm (4.02 in)
Cylinder block materialCast iron
Cylinder head materialCast iron
ValvetrainOHV with 2 valves per cylinder
Valvetrain drive systemTiming gears
Compression ratio18.6:1-22.0:1
RPM range
Idle speed650-750 rpm
Combustion
TurbochargerToyota CT26 on 12H-T
Fuel systemMechanical fuel injection
Direct injection
Fuel typeDiesel
Oil systemWet sump
Cooling systemWater-cooled
Output
Power output91–138 PS (90–136 hp; 67–101 kW)
Torque output205–313 N⋅m (21–32 kg⋅m; 151–231 lb⋅ft)
Chronology
PredecessorToyota D engine
SuccessorToyota HZ engine

H

The H is a 3.6 L (3,576 cc) inline 6, 12-valve OHV diesel engine.[1] Bore is 88 mm and stroke is 98 mm, with a compression ratio of 21:1. Output is 95 PS (70 kW) at 3,600 rpm with 22.0 kg⋅m (216 N⋅m; 159 lb⋅ft) of torque at 2,200 rpm.[1]

Applications

2H

The 2H is a 4.0 L (3,980 cc) inline 6, 12 valve OHV indirect injection diesel engine. Bore is 91 mm and stroke is 102 mm, with a compression ratio of 20.7:1. Output is 105 PS (77 kW) at 3,500 rpm - later production years 107 hp (80 kW) with 177 lb·ft (240 N·m) of torque at 2,000 rpm. This engine weighs 330 kg (728 lb) in European trim from 1985.[2] Compared to its predecessor, the 2H proved to be much more reliable, running 1 million kilometers or more.

Applications

12H-T

The 12H-T is a 4.0 L (3,980 cc) inline 6, 12 valve OHV turbocharged direct injection diesel engine. Bore is 91 mm and stroke is 102 mm, with a compression ratio of 18.6:1. Output is 134 hp (100 kW) at 3500 rpm with 232 lb·ft (315 N·m) of torque at 1,800 rpm, on the stock configuration of 7PSI of boost.[3]

References
  1. "'69 商業車: ニューモデル" ['69 commercial vehicles: New models]. 月刊自動車 [The Motor Monthly] (in Japanese). 11 (8): 122. August 1969. 3439.
  2. Visart, Etienne, ed. (1985-02-07). "Nieuw in 1985 (1)" [New for 1985 (1)]. De AutoGids (in Flemish). Vol. 6, no. 140. Brussels, Belgium: Uitgeverij Auto-Magazine. p. 116.
  3. "Toyota 12H-T (4.0 L) turbo diesel engine: specs and review, service data". Engine Specs. 2019-05-24. Retrieved 2022-06-18.
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