Nissan FJ engine

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The FJ engine was a series of straight-4 four-valve DOHC 2.0- or 2.4litre 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.

Quick facts: FJ engine, Overview, Manufacturer, Layout, Co...
FJ engine
FJ20ET engine in the Nissan Engine Museum
ManufacturerNissan Machinery
Displacement2.0–2.3 L (1,990–2,340 cc)
Cylinder bore89 mm (3.5 in)
92 mm (3.62 in)
Piston stroke80 mm (3.15 in)
88 mm (3.46 in)
Block materialCast Iron
Head materialAluminium
ValvetrainDOHC 4 valves x cyl.
Timing drive systemTiming Chain
Compression ratio8.0:1-11.0:1
TurbochargerOn some versions
Fuel systemCarburetor
Electronic fuel injection
Fuel typeGasoline
Oil systemWet sump
Cooling systemWater-cooled
Power output150–275 PS (110–202 kW; 148–271 hp)
Torque output18.5–25 kg⋅m (181–245 N⋅m; 134–181 lb⋅ft)
Dry weight167 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[citation needed]. 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).[citation needed]

It is acclaimed by some as the forefather of the CA engine.[citation needed] 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.