| Prince G engine | |
| Manufacturer: | Prince Motor Company |
| Production: | 1955-1975 |
| Predecessor: | FG4A |
| Successor: | L16 (G-16) L18 (G-18) L26 (G-20) S20 (GR-8) |
| Configuration: | Inline 4 & Inline 6 |
| Displacement: | Four-cylinder: 1484cc 1593cc 1815cc 1862cc 1990cc Six-cylinder: 1988cc 2494cc |
| Bore: | 752NaN2 802NaN2 822NaN2 842NaN2 89mm |
| Stroke: | 632NaN2 70.22NaN2 802NaN2 842NaN2 852NaN2 |
| Valvetrain: | OHV (GA30, GA4, GB30) SOHC (all except GR-8, GA30, GA4, GB30) DOHC (GR-8) |
| Fueltype: | Gasoline, Diesel |
| Fuelsystem: | SU or Weber carburetors Mechanical fuel injection |
| Coolingsystem: | Water cooled |
| Compression: | 8.3:1, 9.3:1, 9.7:1, 11.0:1 |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
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 1862cc 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.
In 1956, Prince developed a flat-2 engine, the FG2D, for their DPSK (later CPSK) concept car. It displaced 601 cc and produced 240NaN0. The engine suffered excessive vibration and noise issues and was replaced with the FG4C engine.[1]
Prince developed the FG4C, a flat-four displacing 599 cc and producing 380NaN0, as a replacement for the FG2D. The FG4C was used in the 1957 CPSK concept.[1]
1484cc diameter X stroke: NaN2NaN2, OHV
1484cc diameter X stroke: NaN2NaN2, OHV
1484cc diameter X stroke: NaN2NaN2, OHV
Renamed GA-30 in 1958
Applications:
1484cc diameter X stroke: NaN2NaN2, OHV
1484cc diameter X stroke: NaN2NaN2, OHV
1959 improvement on the GA-30; also known as FG4A-40
Applications:
1862cc diameter X stroke: NaN2NaN2, OHV
Also known as FG4B-30
Applications:
1862cc diameter X stroke: NaN2NaN2, OHV
Also known as FG4B-40
Applications:
The Prince G-1 was the improved GA-4, and was rated at 1.5 L, but displaced 1484cc thanks to an entirely different 75by 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 730NaN0 and 120NaN0.
Applications:
The G-2 is a 1862cc version used by Prince. Bore and stroke were square at 842NaN2, and output was 960NaN0 and 15.70NaN0 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 series Prince Gloria as well as the Clipper and Super Miler commercial vehicles. The G-2 was an OHV design.
Applications:
The SOHC G-15 was a 1483cc engine produced in 1967 for the Skyline. Bore and stroke was NaN2NaN2. With a 2 barrel carburetor equipped, the engine produced 940NaN0 and 13.30NaN0. With a crossflow cylinder head, a V-shaped canted valve arrangement and a multi-spherical combustion chamber design, the G-15 was the most technologically advanced Japanese car engine of its day, eclipsing even Nissan's L series engine in their design. The Nissan G engine was not related to the Prince engine; the Nissan version was OHV and slightly smaller displacement.
Applications:
1593cc inside diameter x stroke: NaN2NaN2 mmin, SOHC
The G-15 was bored out 32NaN2 to form the G-16. Adapting the engine to more stringent US emissions was deemed too expensive, and it was replaced by the L16 engine in 1975.
Applications:
The G-18 was a 1815cc. Its 852NaN2 bore was the largest in the range (except for the G20 mentioned in the next paragraph), and the 802NaN2 stroke gave it good oversquare dimensions. It was an SOHC cross flow cylinder head design like the G-15 and produced 1050NaN0 and 15.90NaN0.
This engine was discontinued in 1975 due to tightening emission regulations and replaced with the L18.
Applications:
1990cc inside diameter x stroke: NaN2NaN2, 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.
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.
The G-7 is a straight-6 version displacing 1988cc. 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 752NaN2 and power output varied with the carburetor equipped. Plain versions featured a 2 barrel carb and 8.8:1 for 1060NaN0 and 160NaN0, while the 1965 Skyline GT-B used 3 twin-barrel Weber carburetors and 9.3:1 compression for 1270NaN0 and 170NaN0. It was influenced by the Mercedes-Benz M180 straight six engine.[2] 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:
1988cc inside diameter x stroke: NaN2NaN2
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.
1996cc inside diameter x stroke: NaN2NaN2, DOHC
| R380-I 1965 | R380A-I 1966 | R380A-II 1967 | R380A-III 1968 | R380A-III 1969 | ||
|---|---|---|---|---|---|---|
| Fuel delivery | 3× Weber 42 DCOE | 3× Weber 45 DCOE | Lucas fuel injection | |||
| Power (gross)[4] | 2000NaN0 @ 8000 rpm | over 2000NaN0 @ 8000 rpm | 2200NaN0 @ 8500 rpm | 2450NaN0 @ 8400 rpm | 2500NaN0 @ 8400 rpm | |
| Torque (gross) | 2000NaN0 @ 8000 rpm | over 2000NaN0 @ 8000 rpm | 2200NaN0 @ 8500 rpm | 2450NaN0 @ 8400 rpm | 2500NaN0 @ 8400 rpm--> | |
Racing engine used in the Prince R380 and Nissan R380-II, based on the G7 engine.[3] It used 4 valves per cylinders and DOHC, used 3 Weber carburetors model 42DCOE-18, producing a claimed 2000NaN0 for the R380 and 2200NaN0 for the R380-II.[4] The GR-8 used in the R380-III featured mechanical fuel injection.[4]
The Nissan S20 engine was derived from the GR-8.[5]
The G-11 is another straight-6 OHC version, displacing 2494cc. Bore was up to 842NaN2 like the G-2 4-cylinder, while stroke remained at 752NaN2 as on the G-7. Power output with a 4 barrel carburetor was 1340NaN0 with 19.90NaN0 of torque.
Applications: