Nissan H engine

The Nissan H series of automobile engines is an evolution of the Nissan "R" engine which was based on the 1.5L 3 main "G" used in the 1960s. Both straight-4 and straight-6 versions were produced, it is a pushrod OHV design with iron block, early models with an iron head, later models with aluminum head. Versions of this motor have been used in many Nissan autos and forklifts, well into the eighties and a version called H20II is still in production today. The SD diesels are based on this series of motors (bore spacing and basic block layout)

Nissan H engine
ManufacturerNissan Motors
Production1956-1960, 1962-present
ConfigurationInline-4 & Inline-6
Displacement1.5–3.0 L (1,489–2,974 cc)
Cylinder bore
  • 73 mm (2.87 in)
  • 85 mm (3.35 in)
  • 87.2 mm (3.43 in)
  • 92 mm (3.62 in)
Piston stroke
  • 66 mm (2.6 in)
  • 83 mm (3.27 in)
  • 89 mm (3.5 in)
  • 93 mm (3.66 in)
Block materialCast iron
Head material
Compression ratio8.0:1-9.0:1
Fuel systemCarburetor
Fuel typeGasoline
Cooling systemWater-cooled
Power output50–152 PS (37–112 kW; 49–150 hp)
Torque output159–221 N⋅m (117–163 lb⋅ft)
PredecessorNissan G engine



The 1H is not related to the later H engines. It was also an all-iron, OHV engine, licensed from Austin (B engine). With a bore and stroke of 73 mm × 89 mm (2.87 in × 3.50 in) it displaced 1.5 L (1,489 cc), power was 50 PS (37 kW; 49 hp) at 4,400 rpm in 1956, but this increased to 57 PS (42 kW; 56 hp) in August 1958.[1] The license agreement terminated in the late 1950th and the Nissan G engine was a more compact replacement, which in turn became replaced by the (below) Nissan H engines.



The basic H is a 1.9 L (1,883 cc) engine produced from 1962 for Nissan's Cedric. Bore and stroke was 85 mm × 83 mm (3.35 in × 3.27 in). The 8.0:1 compression version produced 92 hp (69 kW; 93 PS) and 159 N⋅m (117 lb⋅ft), while a high-compression engine (8.5:1) produced 95 hp (71 kW; 96 PS) and 163 N⋅m (120 lb⋅ft).



The H20 is the most-common member of the family. Displacing 2.0 L (1,982 cc) thanks to a larger 87.2 mm (3.43 in) bore, H20 engines produced around 99 hp (74 kW; 100 PS) and 167 N⋅m (123 lb⋅ft).


Also N230S, T40, forklifts and other machinery


The H20P is the LPG-powered version of the H20.



The H25 was developed as a high-output version of the H20. This engine was used in forklifts.

2.5 L (2,472 cc) bore x stroke: 92 mm × 93 mm (3.62 in × 3.66 in).

  • compression ratio 8.7:1
  • maximum output (gross) 62 bhp (46 kW; 63 PS) @ 3200 rpm
  • maximum torque (gross) 132 lb⋅ft (179 N⋅m; 18.2 kg⋅m) @ 1600 rpm

R (H16)Edit

The R engine utilised essentially the same block as the H20, but a 17 mm (0.67 in) shorter piston stroke resulted in a capacity reduction of 387 cc (23.6 cu in). The R was later named H16. The "R" motor made the switch from 3 to 5 main bearings in 1967 for improved reliability, and the H20 was developed from this arrangement. The R/H16 bore and stroke is 87.2 mm × 66.8 mm (3.43 in × 2.63 in) displacing 1.6 L (1,595 cc). With 9.0:1 compression, the engine produced 96 hp (72 kW; 97 PS) and 103 lb⋅ft (140 N⋅m).



The U20 was similar to the H20 but with an SOHC cylinder head. Redesigned in consideration of motor sports. Design by Kenichi Sasaki of Nissan Motor's First Institution Design Department. Not Prince. The U20 produced 135–150 hp (101–112 kW; 137–152 PS).




The K engine is a 2.8 L (2,825 cc) straight-6 engine produced from 1963 to 1965. The K engine is an H engine with two extra cylinders. The K engine produced 118 hp (88 kW; 120 PS).



The H30 is a 3.0 L (2,974 cc) straight-6 version produced from 1965. Output was 120 hp (89 kW; 122 PS) and 163 lb⋅ft (221 N⋅m). The H30 is an H20 with two extra cylinders.


This engine is used in large forklifts

See alsoEdit


  1. ^ Ozeki, Kazuo (2007). 日本のトラック・バス 1918~1972 [Japanese Trucks and Buses 1918-1972:] (in Japanese). Tokyo: Miki Press. pp. 98–99. ISBN 978-4-89522-494-9.
  2. ^ Quattroruote: Tutte le Auto del Mondo 77/78 (in Italian). Milano: Editoriale Domus S.p.A. 1977. pp. 554–556.