Nissan S20 engine
| Nissan S20 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Nissan Motors |
| Production | 1968-1973 |
| Combustion chamber | |
| Configuration | I6 |
| Displacement | 2.0 L (120 cu in) |
| Cylinder bore | 82 mm (3.2 in) |
| Piston stroke | 62.8 mm (2.47 in) |
| Valvetrain | DOHC |
| Combustion | |
| Fuel system |
Three Weber 40DCOE carbs Lucas mechanical fuel injection (after 1969) |
| Output | |
| Power output | 120 kW (160 hp) |
| Torque output | 180 N·m (130 lb·ft) |
| Dimensions | |
| Dry weight | 199 kg (439 lb) |
| Chronology | |
| Predecessor | Prince GR-8 |
The Nissan S20 engine (1989 cc) was a straight-6, DOHC internal combustion engine produced by Nissan (designed by the former Prince engineers) in the 1970s. It was essentially a revised production variant of the 1966 Prince GR8 engine from Prince/Nissan's R380 racecar. It produces 160 hp (120 kW) @7000 rpm and 180 N·m (130 ft·lbf). The S20 weights 199 kg (439 lb).
The S20 powered Nissan's Skyline GT-R (C10 and C110) and Fairlady Z432 models
History
The S20 was one of the technical carryovers to the Nissan brand from Prince technology. The Skyline model - built as a Prince car since the model's inception in the 1950s - received the new engine. The Skyline GT-B in 1969 saw the introduction of the PGC10 GT-R, followed by the KPGC10 GT-R with a shorter wheelbase and 2 fewer doors in 1970. This model would later win a 50 straight touring car victories. For 1972, Nissan introduced the C110 Skyline powered by the L series of engines. A small number of KPGC110 GT-R would be built utilizing the remainder of the S20s.
The S20 was later fitted to the Nissan Fairlady Z432, a sports racing model of the Nissan Fairlady Z (S30) model line.
The S20 features a dual overhead cam, cross-flow head with four valves per cylinder, and pent roof combustion chamber. Early versions were fed via triple Weber 40DCOE carbs; models after 1969 featured Lucas mechanical fuel injection. In racing trim, the fuel-injected motors reportedly produced over 225 bhp (168 kW), with 250 bhp (190 kW) for larger tracks like Fuji Speedway.
This engine was used in the following vehicles:
- Skyline GT-R (PGC10 type) 4-door sedan 1969 - 1970. (832 units)
- Skyline GT-R (KPGC10 type) 2-door coupe 1970 - 1972. 70 mm (2.8 in) shorter wheelbase than the PGC10. (1,197 units)
- Skyline GT-R (KPGC110 type) January–April 1973. (197 units)
- Fairlady Z432 (PS30) 1969 - 1972
- Fairlady Z432R (PS30SB) Z432 race car based nearly 100 kg (220 lb) lighter than production Z432. (3 units)
Engine specifications
- DOHC 1989 cc (2.0L) inline six-cylinder water-cooled gasoline engine
- Bore x Stroke 82x62.8mm
- Maximum output (gross) 160 hp (119 kW; 162 PS) @ 7000 rpm
- Maximum torque (gross) 130 lb·ft (176 N·m) @ 5600 rpm
- Solex Mikuni carburetor fuel supply system * x3 N40PHH
- 4-valve lifter valve direct-driven
- 06 liter oil capacity
- dry weight 199 kg (439 lb)
