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The FJ engine was a series of straight-4 four-valve DOHC 2.0- or 2.4–litre internal combustion engines produced by Nissan in the 1980s. They were one of the first mass-produced Japanese engines with more than two valves per cylinder, as well as having electronic fuel injection.
|Displacement||2.0–2.3 L (1,990–2,340 cc)|
|Cylinder bore||89 mm (3.5 in)|
92 mm (3.62 in)
|Piston stroke||80 mm (3.15 in)|
88 mm (3.46 in)
|Block material||Cast Iron|
|Valvetrain||DOHC 4 valves x cyl.|
|Timing drive system||Timing Chain|
|Turbocharger||On some versions|
Electronic fuel injection
|Oil system||Wet sump|
|Power output||150–275 PS (110–202 kW; 148–271 hp)|
|Torque output||18.5–25 kg⋅m (181–245 N⋅m; 134–181 lb⋅ft)|
|Dry weight||167 kg (368 lb)|
The FJ series came in 2.4 L guise as a rally motor for the 240RS, and 2.0 L for general production models. A 1.5 L variant was designed and a prototype was built, however it never went into production. It has an aluminium head, chain driven cams, and an iron block. It featured large ports, dual valve-springs and a wide angle bucket on shim valvetrain design similar to other (later) Nissan twincams like the VG, CA, RB, and KA, series DOHC motors and the previous S20 6 cyl DOHC motor from the early 1970s GT-R. The FJ20 weighs 166 kg (366 lb) while the FJ24 weighs 167 kg (368 lb). Turbo motors were only available in Japan and New Zealand while the non-turbo variants were available in Japan, Hong-Kong, Australia and Europe. It was discontinued in the mid-1980s due to its prohibitive cost (mainly due to its cast-iron block).
It is acclaimed by some as the forefather of the CA engine. Although the DOHC CA head is similar, this is unlikely, as the SOHC CA head was devised as a lightweight replacement for the L/Z series motors when the FJ first entered production, and the DOHC CA head appeared later when the RB series was released. Datsun enthusiasts like to swap FJ engines into L or Z series powered vehicles. The FJ has similar mounting points to L/Z/KA blocks.