Nissan S20 engine
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The Nissan S20 engine 2.0 L (1,990 cc) was a straight-6, DOHC internal combustion engine produced by Nissan (designed by the former Prince engineers) from 1969 to 1973. It was essentially a revised production variant of the 1966 Prince GR8 engine from Prince/Nissan's R380 racecar. It produces 160 hp (119 kW; 162 PS) at 7000 rpm and 177 N⋅m; 130 lbf⋅ft (18 kg⋅m) of torque at 5600 rpm. The S20 weighs 199 kg (439 lb). This engine is not to be confused with the unrelated Nissan SR20, which is a straight 4 cylinder petrol engine used in other Nissan models.
|Nissan S20 engine|
|Displacement||2.0 L; 121.4 cu in (1,990 cc)|
|Cylinder bore||82 mm (3.23 in)|
|Piston stroke||62.8 mm (2.47 in)|
|Valvetrain||DOHC 4 valves x cyl.|
|Fuel system||3x Mikuni-Solex N40PHH-A24 carburetors|
Lucas mechanical fuel injection
|Power output||160 hp (119 kW; 162 PS)|
|Specific power||80.4 hp (60.0 kW; 81.5 PS) per liter|
|Torque output||177 N⋅m; 130 lbf⋅ft (18 kg⋅m)|
|Dry weight||199 kg (439 lb)|
Compared to the Nissan L series straight six engines, the S20 was too small and too complex. In the 1970 All-Japan Fuji 1000km race, 6 Fairlady Z 432R models were entered with the S20, and one with an L24 fitted. The Z fitted with the L24 won easily, and due to its simpler and more robust design, the L- series went on to become the favored engine in motorsport and tuning, while the S20 remains relatively obscure.
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 49 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 features a dual overhead cam, cross-flow head with four valves per cylinder, and pent-roof combustion chamber. Most engines utilized triple Mikuni-Solex 40PHH dual-choke carburetors; models after 1969 offered optional Lucas mechanical fuel injection. In racing trim, the fuel-injected motors reportedly produced over 225 bhp (168 kW), with 250 bhp (186 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)
- 1,990 cc (2.0 L; 121.4 cu in) water-cooled gasoline inline-six engine
- Bore x Stroke 82 mm × 62.8 mm (3.23 in × 2.47 in)
- Maximum output (gross) 160 bhp (119 kW; 162 PS) @ 7,000 rpm
- Maximum torque (gross) 177 N⋅m; 130 lbf⋅ft (18 kg⋅m) @ 5,600 rpm
- Triple Mikuni-Solex N40PHH-A24 2-barrel carburetors
- DOHC 4 valves per cylinder, lifter valve direct-driven
- 06 liter oil capacity
- dry weight 199 kg (439 lb)
- "1969 Nissan Skyline GT-R Hardtop C10". carfolio.com. Retrieved July 23, 2018.