The Nissan Y40 is a 4.0 l (3,988 cc, 243.4 cu-in) gasoline-fueled, four-stroke, spark-ignition internal-combustion V8 automobile piston engine, manufactured by the Nissan Motor Company from 1965 through 1973. Nissan built its first V8, in 1965 for its President limousine. The Y engine has been succeeded by two families of V8, the VH series during the 1980s and 1990s and the new VK series, which is also used in select Infiniti models.
The Y40 engine has OHV cylinder head design with 16 valves (2 per cylinder) and a 4-barrel carburetor Hitachi KHA-342-IE with dual throat down draught. It produces 197.0 PS (145.0 KW; 194.0 HP) at 5,000 rpm of output power and 323 Nm (32.9 kg·m; 238.4 lbf·ft) at 3,200 rpm of torque.
The Nissan Y40 bore is 92.0 mm (3.6 in) and stroke is 75.0 mm (3.0 in) and the compression ratio rating is 9.0:1.
The breakdown of the engine code is as follows:
- Y – Engine Family
- 40 – 4.0 Liter Displacement
General information
| Engine Specifications | |
| Engine code | Y40 |
| Layout | Four stroke, V8 (90 °:) |
| Fuel type | Gasoline |
| Production | 1965-1973 |
| Displacement | 4.0 l, 3,988 cc (243.4 cu-in) |
| Power output | 197.0 PS (145.0 KW; 194.0 HP) at 5,000 rpm |
| Torque output | 323 Nm (32.9 kg·m; 238.4 lbf·ft) at 3,200 rpm |
| Fuel system | Carburetor: Hitachi KHA-342-IE |
| Power adder | None |
| Firing order | 1-8-4-3-6-5-7-2 |
| Dimensions (L x H x W): | – |
| Weight | |
Cylinder block and head
The Y40 engine has a cast-iron cylinder block with five main bearings. The cylinder bore is 92 mm (3.6 in) and the piston stroke is 75 mm (3.0 in).
| Cylinder block | |
| Cylinder block alloy | Cast-iron |
| Compression ratio: | 9.0:1 |
| Cylinder bore: | 92.0 mm (3.6 in) |
| Piston stroke: | 75.0 mm (3.0 in) |
| Cylinder head | |
| Valve Arrangement: | OHV |
| Valves: | 16 (2 valves per cylinder) |
Vehicle applications
| Model | Years Produced |
| Nissan President H150 | 1965-1973 |
| Nissan Cedric Patrol Y130 (Police only) | 1965-1971 |
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