Prince G engine
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. Straight-4. FG4A-10. diameter X stroke: , OHV FG4A-20. diameter X stroke: , OHV FG4A-30. diameter X stroke: , OHV Renamed GA-30 in 1957 Applications: GA-30. diameter X stroke: , OHV GA-4. diameter X stroke: , OHV 1959 improvement on the GA-30; also known as FG4A-40 Applications: GB-30. diameter X stroke: , OHV Also known as FG4B-30 Applications: GB-4. diameter X stroke: , OHV Also known as FG4B-40 Applications: G-1. The Prince G-1 was the improved GA-4, and was rated at 1.5 L, but displaced thanks 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: G-2. 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: G-15. The SOHC G-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: G-16. inside diameter x stroke: mmin, SOHC A major mechanical change in 1975 and was replaced by the Nissan L16 engine. Applications: 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: G-20. inside diameter x stroke: , SOHC Twin Barrel single Carburetor Twin SU carburetor regular gasoline Twin SU carburetor high octane gasoline 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. Engine displacement was kept below 2000cc to limit the amount of Road tax to be paid yearly in addition to other Japanese Government mandated expenses. 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 . It was influenced by the Mercedes-Benz M180 straight six engine. The intake and exhaust manifolds are on the left side of the engine because Japanese drivers sit on the right side and the steering column would interfere, while the Mercedes-Benz engine places the intake and exhaust on the right side due to left hand driving conditions. Applications: G7B-R. 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. GR-8 . inside diameter x stroke: , DOHC 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-III featured mechanical fuel injection. The Nissan S20 engine was derived from the GR-8. 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: