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S20 engine installed in Datsun Fairlady Z432

The Nissan S20 engine (1998 cc) was a straight-6, DOHC internal combustion engine produced by Nissan in the 1970s. It was essentially the same as the 1966 Nissan Prince (Skyline) GR8 engine of 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 lbs)

The S20 powered Nissans Skyline GT-R (C10 and C110) and Fairlady Z432 models

The S20 was a one of the many technical carryovers to the Nissan brand from Prince technology. The Skyline model, having originally been built as a Prince car since the model's inception in the 1930s, was a clear choice for the new engine. With the success of the Skyline GT-B, 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 record 50 stright touring car victories. For 1971, Nissan introduced the C110 Skyline. It would be powered by the L series of engines, while a very small number of KC110 GT-R would be built; reportedly utilizing the remainder of the S20s Nissan had on hand.

The S20 was later fitted to the Fairlady Z432 was a sports racing model to the already potent and capable S30 model line.

S20 engines regularly sell for over $10,000USD even today. Given their legendary status and low production volume, this is not surprising. The engine is so popular to this day that major companies such as Tomei, TODA and JUN still produce parts for this series of engine.

The S20 features a dual overhead cam, cross flow head with four valves per cyliner and hemispherical combustion chambers. 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.

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