The Prince G-series engine was the company's only straight-four and straight-six engines which began production in 1955. A number of variations were made, with both OHV and OHC heads. A diesel four-cylinder with was also built, called the D-6. 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.
The Prince G-1 was the improved GA-4, and was rated at 1.5 L, but displacedthanks to an entirely different 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 and. Applications:
The G-2 is a version used by Prince. Bore and stroke were square at, and output was and with a 2 barrel carburetor. It was an improved version of the GB-4 and was introduced in 1962 and was installed in the S40 Prince Gloria. The G-2 was an OHV design. Applications:
1962-1965 Prince Gloria S40
1963-1967 Prince Clipper T631
1964-1967 Prince Super Miler T441
G-15
The SOHCG-15 was a engine produced in 1967 for the Skyline. Bore and stroke was. With a 2 barrel carburetor equipped, the engine produced and. The Nissan G15 engine was not related to the Prince engine; the Nissan version was OHV and slightly smaller displacement. Applications:
bore increase of the G-15 engine, increased to a 1.6 L and used on the Skyline. A major mechanical change in 1975 and was replaced by the Nissan L16 engine. Applications:
1972-1975 Nissan Skyline 1600
G-18
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. Its bore was the largest in the range, and the stroke gave it good oversquare dimensions. It was an SOHC cross flow cylinder head design like the G-15 and produced and. This engine was discontinued in 1975 due to tightening emission regulations and replaced with the L18. Applications:
This engine was only used in the 1968-1975 C30 & C130 Laurel, and was discontinued in 1975 due to tightening emission regulations and replaced with the L26 engine.
Straight-6
Prince used a straight-6 version of the G family in their famous Skyline cars. All of the Prince straight-6 engines used single overhead cam heads.
G-7
The G-7 is a straight-6 version displacing. 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 and power output varied with the carburetor equipped. Plain versions featured a 2 barrel carb and 8.8:1 for and, while the 1965 Skyline GT-B used 3 twin-barrel Weber carburetors and 9.3:1 compression for and. Applications:
inside diameter x stroke: 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.
Racing engine used in the Prince R380 and Nissan R380-II, based on the G7 engine. It used 4 valves per cylinders and DOHC, used 3 Weber carburetors model 42DCOE-18, producing a claimed for the R380 and for the R380-II. The GR-8 used in the R380-II featured mechanical fuel injection.
G-11
The G-11 is another straight-6 OHC version, displacing. Bore was up to like the G-2 4-cylinder, while stroke remained at as on the G-7. Power output with a 4 barrel carburetor was with of torque. Applications:
