The Y engine is a family of V8 engines designed and produced by Nissan between 1965 and 1990 for limousines.
Y40
The Y40 was a water-cooled OHV V8 engine produced for the Nissan President limousine between 1965 and 1973. It displaces 4.0 L (3,988 cc) with a bore and stroke of 92 mm × 75 mm (3.62 in × 2.95 in). It has 16 valves (two per cylinder) and a 4-barrel carburetor and 9.0:1 compression ratio. It produces 195 PS (143 kW; 192 hp) at 5000 rpm and 237 lb⋅ft (321 N⋅m) at 3200 rpm, a high point for Nissan at the time.
The Y44 is an OHV V8, 16 valve, 4 barrel down draught carb engine produced for the Nissan President and since 1975 used electronic fuel injection. It produced 200 PS (147 kW; 197 hp) at 4800 rpm and 343 N⋅m (253 lb⋅ft) at 3200 rpm. In 1975, Nissan introduced its emission regulation technology called NAPS (Nissan Anti Pollution System).
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