Nissan H engine#H

{{Infobox automobile engine

| name = Nissan H engine

| production = 1954-2003

| displacement = {{convert|1489-2974|cc|L|1|abbr=on|disp=flip}}

| bore = {{ubl|{{convert|73|mm|2|abbr=on}}|{{convert|85|mm|2|abbr=on}}|{{convert|87.2|mm|2|abbr=on}}|{{convert|92|mm|2|abbr=on}}}}

| stroke = {{ubl|{{convert|66|mm|abbr=on}}|{{convert|83|mm|2|abbr=on}}|{{convert|89|mm|abbr=on}}|{{convert|93|mm|2|abbr=on}}}}

| block = Cast iron

| head = {{ubl|Cast iron|Aluminum (later versions)}}

| valvetrain = {{ubl|OHV|SOHC (U20)}}

| fueltype = Gasoline

| fuelsystem = Carburetor

| coolingsystem = Water-cooled

| compression = 8.0:1-9.0:1

| power = {{convert|50-152|PS|kW hp|0|abbr=on}}

| torque = {{Convert|159-221|Nm|lbft|0|abbr=on}}

}}

The Nissan H series of automobile engines is an evolution of the Nissan "R" engine which was based on the 1.5-liter, three-main bearing "G" engine used in the 1960s. Both inline-four and inline-six 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 was in production until 2003. The SD diesels are based on this series of motors (bore spacing and basic block layout)

Inline-4

=1H=

The 1H is not related to the later H engines. It was also an all-iron, OHV engine, but this was a licensed BMC (Austin) B engine. With a bore and stroke of {{convert|73x89|mm|2|abbr=on}} it displaced {{convert|1489|cc|L|1|abbr=on|disp=flip}}, power was {{convert|50|PS|kW hp|0|abbr=on}} at 4,400 rpm in 1956, but this increased to {{convert|57|PS|kW hp|0|abbr=on}} in August 1958.{{Cite book | author = Ozeki, Kazuo |script-title=ja:日本のトラック・バス 1918~1972 | trans-title = Japanese Trucks and Buses 1918-1972: | publisher = Miki Press | year = 2007 | pages = 98–99 | location = Tokyo | language = Japanese | isbn = 978-4-89522-494-9 }} The license agreement terminated in the late 1950s and the Nissan G engine was a more compact replacement, which in turn became replaced by the (below) Nissan H engines. The 1H would also be de-stroked from 89mm to 59mm to become the 1.0 L (990 cc) to create the Nissan C engine at the suggestion of former Willys-Overland engineer Donald Stone. {{cite book |last1=Halberstam |first1=David |title=The Reckoning |date=2012 |publisher=Open Road Integrated Media |location=New York |isbn=978-1453286104}}{{cite book |title=Britain & Japan : biographical portraits. Vol. VI |date=2007 |publisher=Global Oriental Ltd |location=Folkestone, UK |isbn=978-9004217850 |page=104-105}}

Applications:

1954-1959 Nissan Austin
1956-1960 Nissan Junior B40/42

=H=

The basic H is a {{Convert|1883|cc|L|1|abbr=on|disp=flip}} engine produced from 1962 for Nissan's Cedric. Bore and stroke was {{Convert|85x83|mm|in|2|abbr=on}}. The 8.0:1 compression version produced {{Convert|92|hp|kW PS|0|abbr=on}} and {{Convert|159|Nm|lbft|0|abbr=on}}, while a high-compression engine (8.5:1) produced {{Convert|95|hp|kW PS|0|abbr=on}} and {{Convert|163|Nm|lbft|0|abbr=on}}.

Applications:

1962 Nissan Cedric 31 (high-compression)
1962-1965 Nissan Junior 40
1962-1965 Nissan Caball C141
1962-1966 Nissan Echo GC141

=H20=

The H20 is the most-common member of the family. Displacing {{Convert|1982|cc|L|1|abbr=on|disp=flip}} thanks to a larger {{Convert|87.2|mm|2|abbr=on}} bore, H20 engines produced around {{Convert|99|hp|kW PS|0|abbr=on}} and {{Convert|167|Nm|lbft|0|abbr=on}}.

Applications:

1965-1971 Nissan Cedric 130
1966-1970 Nissan Junior 41
1966-1967 Nissan Caball C142
1966-1972 Nissan Clipper T65
1967-1976 Nissan Caball C240
1971-1975 Nissan Cedric 230
1971-1975 Nissan Junior 140
1975-1982 Nissan Junior 141
1976-1979 Nissan Cedric 330
1979-1983 Nissan Cedric 430
1970s Yue Loong Cedric 803 ({{convert|91|PS|kW hp|0|abbr=on|disp=or}} at 4,800 rpm){{Cite book | title = Quattroruote: Tutte le Auto del Mondo 77/78 | publisher = Editoriale Domus S.p.A | year = 1977 | language = Italian | pages = 554–556 | location = Milano }}
Nissan Caravan/Homy
1980-1982 Nissan Urvan

Also N230S, T40, forklifts and other machinery

=H15=

The H15 is an improved, smaller version of the H20-II. It was used in forklifts.

Applications:

Nissan J-type forklift (J01M09, J01A15, etc.)

=H20-II=

The H20-II is an improved version of the H20. It was used in forklifts.

Applications:

Nissan J-type forklifts (J02M20, J01A30, etc.)

=H20P=

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

Applications:

1976-1979 Nissan Cedric 330
1975-1979 Nissan Gloria 330

=H25=

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

{{convert|2472|cc|L|1|abbr=on|disp=flip}} bore x stroke: {{Convert|92x93|mm|in|2|abbr=on}}.

compression ratio 8.7:1
maximum output (gross) {{convert|62|bhp|kW PS|abbr=on}} @ 3200 rpm
maximum torque (gross) {{convert|132|lbft|Nm kgm|abbr=on}} @ 1600 rpm

=R (H16)=

The R engine used essentially the same block as the H20, but a {{Convert|17|mm|abbr=on}} shorter piston stroke resulted in a capacity reduction of {{convert|387|cc|abbr=on}}. 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 {{convert|87.2x66.8|mm|2|abbr=on}} displacing {{convert|1595|cc|L|1|abbr=on|disp=flip}}. With 9.0:1 compression, the engine produced {{convert|96|hp|kW PS|0|abbr=on}} and {{convert|103|lbft|Nm|0|abbr=on}}.

Applications:

1965-1967 Nissan Bluebird R411 SSS
1965-1968 Nissan Silvia CSP311
1967-1970 Datsun Sports SP311/SPL311
1968-1972 Nissan Homer T641

=U20=

The U20 was similar to the H20 but with an SOHC cylinder head for motorsports applications. Although Prince Motor Company is credited in many sources with designing the U20, it was actually designed in-house at Nissan by Kenichi Sasaki. The U20 was produced in two forms: a stock {{convert|135|hp|PS|0|abbr=on}} version with twin SU carburetors, or a {{convert|150|hp|PS|0|abbr=on}} version with twin Mikuni/Solex carburetors and a "B" model camshaft.

Applications:

1967.5-1970 Datsun Sports SR311

Straight-6

=K=

The K engine is a {{convert|2825|cc|L|1|abbr=on|disp=flip}} straight-6 engine produced from 1963 to 1965. The K engine is an H engine with two extra cylinders. The K engine produces {{cvt|115|PS|kW hp|0}} at 4,400 rpm, {{cvt|21.0|kgm|Nm lbft|0}} at 2,400 rpm.{{cite web | url = https://www.nissan.co.jp/HERITAGE/DETAIL/35.html | archive-url = https://web.archive.org/web/20250209152706/https://www.nissan.co.jp/HERITAGE/DETAIL/35.html | archive-date = 2025-02-09 | title = セドリックスペシャル | trans-title = Cedric Special | work = Nissan Heritage Collection | publisher = Nissan Motor Corporation }}

Applications:

1963-1965 Nissan Cedric Special 50

=H30=

The H30 is a {{convert|2974|cc|L|1|abbr=on|disp=flip}} straight-6 version produced from 1965. Output ranged from {{cvt|120|to|130|PS|kW|0}} and torque is {{convert|163|lbft|Nm|0|abbr=on}}. The H30 is an H20 with two extra cylinders.

Applications: