Nissan H engine

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Nissan H engine
Manufacturer Nissan Motors
Production 1956-1960, 1962-present
Combustion chamber
Configuration I4 & I6
  • 1.5L
  • 1.6L
  • 1.9L
  • 2.0L
  • 2.5L
  • 3.0L
Cylinder block alloy Cast iron
Cylinder head alloy
Fuel system Carburetor
Predecessor Nissan G 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)



The 1H is not related to the later H engines. It was also an all-iron, OHV engine, but with a bore and stroke of 73 and 89 mm it displaced 1,489 cc. Power was 50 PS (49 hp) at 4,400 rpm in 1956, but this increased to 57 PS (56 hp) in August 1958.[1]



The basic H is a 1.9 L (1,883 cc) engine produced from 1962 for Nissan's Cedric. Bore was 85 mm (3.3 in) and stroke was 83 mm (3.3 in). The 8.0:1 compression version produced 92 hp (69 kW) and 117 lb·ft (159 Nm), while a high-compression engine (8.5:1) produced 95 hp (71 kW) and 120 lb·ft (163 Nm).



The H20 is the most-common member of the family. Displacing 2.0 L (1,982 cc) thanks to a larger (87.2 mm) bore, H20 engines produced around 99 hp (74 kW) and 123 lb·ft (167 Nm).


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.

2472 cc (2.5L) inside diameter x stroke: 92.0 mm (3.6 in) x 93.0 mm (3.7 in).

  • compression ratio 8.7
  • 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


The R engine utilised essentially the same block as the H20, but a 17 mm shorter piston stroke resulted in a capacity reduction of 387 cc. 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 87.2mm x 66mm displacing 1,595 cc. With 9.0:1 compression, the engine produced 96 hp (97 PS) and 103 lb·ft (140 N·m).



The U20 was similar to the H20 but with an SOHC cylinder head designed by Prince. The U20 produced 135-150 hp.




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 (120 PS).



The H30 is a 3.0 L (2,974 cc) straight-6 version produced from 1965. Output was 120 hp (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 also[edit]


  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.