Prince G engine

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Prince G engine
Manufacturer Prince Motor Company
Production 1955-1975
Successor L16 (G-16)
L18 (G-18)
L26 (G-20)
S20 (GR-8)
Configuration I4 & I6
Displacement Four-cylinder:

Valvetrain OHV (GA30, GA4, GB30)
SOHC (all except GR-8, GA30, GA4, GB30)

The Prince G-series engine was the company's only straight-4 and straight-6 which began production in 1955. A number of variations were made, with both OHV and OHC heads. The G series was used in the Skyline, the Laurel and the Gloria from the 1950s to the early 1970s.

Note that, prior to its merger with Prince, Nissan also made a G series of engines. These are unrelated engines and are documented at the Nissan G engine page.

The source of the listed information is the corresponding article at Japanese Wikipedia.




1484 cc diameter X stroke: 75.0 mm (3.0 in) x 84.0 mm (3.3 in), OHV

  • Maximum output (gross) 60 PS (44 kW; 59 bhp) @ 4400 rpm
  • Maximum torque (gross) 10.75 kg·m (105.4 N·m; 77.8 lb·ft) @ 3200 rpm


1484 cc diameter X stroke: 75.0 mm (3.0 in) x 84.0 mm (3.3 in), OHV

  • Maximum output (gross) 70 PS (51 kW; 69 bhp) @ 4800 rpm
  • Maximum torque (gross) 11.75 kg·m (115.2 N·m; 85.0 lb·ft) @ 3600 rpm

1959 improvement on the GA30

  • Mechanical simiarities with engine used in Subaru 1500



1862 cc diameter X stroke: 84.0 mm (3.3 in) x 84.0 mm (3.3 in), OHV

  • Maximum output (gross) 94 PS (69 kW; 93 bhp) @ 4800 rpm
  • Maximum torque (gross) 15.6 kg·m (153 N·m; 113 lb·ft) @ 3600 rpm


1862 cc inside diameter x stroke: 84.0 mm (3.3 in) x 84.0 mm (3.3 in), OHC

  • Maximum output (gross) 91 PS (67 kW; 90 bhp) @ 4800 rpm
  • Maximum torque (gross) 15.0 kg·m (147 N·m; 108 lb·ft) @ 3600 rpm

Was used on the 1961 Skyline 1900 Deluxe (BLSID-3), and was used in the Skyline "Super Shark" (BLRA-3 & R21B), was also used on the 1957 Skyway delivery van.


The Prince G-1 was the improved GA4, and was rated at 1.5 L, but displaced 1.5 L (1484 cc/90 in³) thanks to an entirely different 75 mm (3.0 in) by 84 mm (3.3 in) bore and stroke. This undersquare arrangement was similar to the designs Nissan licensed from Austin Motor Company, though this is probably coincidental. This engine was also an OHV design and power output was similar to the Nissan G at 73 hp (54 kW) and 87 lb·ft (118 N·m) .



The G-2 is a 1.9 L (1862 cc/113 in³) version used by Prince. Bore and stroke were square at 84 mm (3.3 in), and output was 96 hp (72 kW) and 113.5 lb·ft (153.9 N·m) with a 2 barrel carburetor. It was an improved version of the GB-4 and was introduced in 1962 and was installed in the "Skyline Super" S21D. The G-2 was an OHV design.



The SOHC G-15 was a 1.5 L (1483 cc/90 in³) engine produced in 1967 for the Skyline. Bore was 80 mm (3.1 in) and stroke was 70.2 mm (2.76 in). With a 2 barrel carburetor equipped, the engine produced 94 hp (70 kW) and 96 lb·ft (130 N·m). The Nissan G15 engine was not related to the Prince engine; the Nissan version was OHV and slightly smaller displacement.



1593 cc inside diameter x stroke: 85.0 mm (3.3 in) x 70.2 mm (2.8 in), SOHC

  • maximum output (gross) 100 PS (74 kW; 99 bhp) @ 6000 rpm
  • Maximum torque (gross) 13.8 kg·m (135 N·m; 100 lb·ft) @ 4000 rpm

3 mm (0.1 in) bore increase of the G-15 engine, increased to a 1.6 L and used on the Skyline (C110). A major mechanical change in 1975 and was replaced by the Nissan L16 engine.


5-bearing, short-stroke, V-type valve arrangement, multi-ball-type combustion chamber, the G18 employs an aluminum cylinder head and engine-performance.

The G-18 was a 1.8 L (1815 cc/110 in³) variant. Its 85 mm (3.3 in) bore was the largest in the range, and the 80 mm (3.1 in) stroke gave it good oversquare dimensions. It was an SOHC cross flow cylinder head design like the G-15 and produced 105 hp (78 kW) and 108.5 lb·ft (147.1 N·m).

This engine was discontinued in 1975 due to tightening emission regulations and replaced with the L18.



1990 cc inside diameter x stroke: 89.0 mm (3.5 in) x 80.0 mm (3.1 in), SOHC

Twin Barrel single Carburetor

  • compression ratio 8.3
  • maximum output (gross) 110 PS (81 kW; 110 bhp) @ 5600 rpm
  • maximum torque (gross) 16.5 kg·m (162 N·m; 119 lb·ft) @ 3200 rpm

SU Twin Carburetor regular gasoline

  • compression ratio 8.3
  • maximum output (gross) 120 PS (88 kW; 120 bhp) @ 5800 rpm
  • maximum torque (gross) 17.0 kg·m (167 N·m; 123 lb·ft) @ 3600 rpm

SU Twin Carburetor high octane gasoline

  • compression ratio 9.7
  • maximum output (gross) 125 PS (92 kW; 123 bhp) @ 5800 rpm
  • maximum torque (gross) 17.2 kg·m (169 N·m; 124 lb·ft) @ 3600 rpm

This engine was only used in the C30 & C130 Laurel, and was discontinued in 1975 due to tightening emission regulations and replaced with the L26 engine.


Prince used a straight-6 version of the G family in their famous Skyline cars. All of the Prince engines used single overhead cam heads.


Prince G-7 engine

The G-7 is a straight-6 version displacing 2.0 L (1988 cc/121 in³). It was the engine of the GT-model Prince Skylines and was an OHC engine unlike the mainly-OHV family that spawned it. Bore and stroke were square at 75 mm (3.0 in) and power output varied with the carburetor equipped. Plain versions featured a 2 barrel carb and 8.8:1 for 106 hp (79 kW) and 116 lb·ft (157 N·m), while the 1965 Skyline GT-B used 3 Weber 2 barrel carbs and 9.3:1 compression for 127 hp (95 kW) and 123 lb·ft (167 N·m).



1988cc (2.0L) inside diameter x stroke: 75.0 mm (3.0 in) x 75.0 mm (3.0 in)

An improvement on the G7 using a cross-flow cylinder head and was converted into racing use during 1965 - 1966 in the S54 Skyline GT used for racing. Was not commercially available.


1996 cc (2.0L) inside diameter x stroke: 82.0 mm (3.2 in) x 63.0 mm (2.5 in)

Racing engine used in the Prince R380, based on the G7 engine. Used 4 valves per cylinders and DOHC, used 3 Weber carburetors model 40DCOE-18, producing a claimed 200 hp (149 kW).


The G-11 is another straight-6 OHC version, displacing 2.5 L (2494 cc/152 in³). Bore was up to 84 mm (3.3 in) like the G-2 4-cylinder, while stroke remained at 75 mm (3.0 in) as on the G-7. Power output with a 4 barrel carburetor was 134 hp (100 kW) with 144 lb·ft (195 N·m) of torque.


See also

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