The Nissan SR18Di is a 1.8 l (1,838 cc, 112.1 cu-in) straight-four, four-stroke, liquid-cooled, internal combustion gasoline engine from the SR-family, manufactured by the Nissan Motor Company from 1989 to 1993.
The Nissan SR18Di motor uses some cast-iron block, an aluminum head with the dual overhead camshaft (DOHC) and Single Point Fuel Injection system.
The SR18Di engine cylinder bore is 82.5 mm (3.25 in), piston stroke is 86.0 mm (3.39 in) and the compression ratio rating is 9.5:1.
With a 9.5:1 static compression ratio, the factory quoted power and torque outputs are 110.0 PS (81.0 kW; 108.0 HP) at 6,500 rpm and 150.0 Nm (15.3 kg·m; 110.7 lbf·ft) at 4,000 rpm.
This engine was used in Nissan medium models for Japan domestic market and some UK models.
The breakdown of the engine code is as follows:
- SR – Engine Family
- 18 – 1.8 Liter Displacement
- D – DOHC (Dual Overhead Camshafts)
- i – Throttle Body Fuel Injection
General information
| Engine Specifications | |
| Engine code | SR18Di |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline |
| Production | – |
| Displacement | 1.8L, 1,838 cc (112.1 cu-in) |
| Power output | 110.0 PS (81.0 kW; 108.0 HP) at 6,500 rpm |
| Torque output | 150.0 Nm (15.3 kg·m; 110.7 lbf·ft) at 4,000 rpm |
| Fuel system | Single Point Fuel Injection |
| Power adder | None |
| Cooling system | Liquid-cooling |
| Firing order | 1-3-4-2 |
| Dimensions (L x H x W): | – |
| Weight | 330 lbs (150 kg) |
Cylinder block
The cylinder block, which is of a monoblock special casting structure, adopts a five-bearing-support system for quietness and higher durability. Cylinder bore was 82.5 mm (3.25 in) and stroke was 86 mm (3.4 in). The 1.8-litre SR18Di employs the same block as the SR18DE with Multi-Point Fuel Injection System.
| Cylinder block | |
| Cylinder block alloy | Cast iron |
| Compression ratio: | 9.5:1 |
| Cylinder bore: | 82.5 mm (3.25 in) |
| Piston stroke: | 86.0 mm (3.39 in) |
| Bore Pitch (Bore Spacing): | 97.0 mm (3.8 in) |
| Block Height: | – |
| Con rod length: | – |
| Crankshaft journal diameter: | 55.0 mm (2.165 in) |
| Crankpin diameter: | 48.0 mm (1.889 in) |
Cylinder head
The cylinder head was made of light and strong aluminum alloy with good cooling efficiency. Two camshafts were driven by a single row chain driven by the crankshaft. Intake valves are 32.0 mm (1.26 in) in diameter, and the exhaust valves are 28.0 mm (1.10 in).
| Cylinder head | ||
| Cylinder head alloy | Aluminum | |
| Valve Arrangement: | DOHC, chain drive | |
| Valves: | 16 (4 valves per cylinder) | |
| Valve head diameter (INTAKE): | 32.0 mm (1.259 in) | |
| Valve head diameter (EXHAUST): | 28.0 mm (1.102 in) | |
Problems and malfunctions
This engine is as reliable and durable as SR20DE. It does not have any serious problems or faults and will serve more than 250,000 miles of mileage (400,000 km).
Maintenance data
| Oil system | |
| Oil consumption , L/1000 km (qt. per miles) | up to 0.5 (1 qt. per 1200 miles) |
| Recommended engine oil | 5W-30, 5W-40, 10W-30, 10W-40 |
| Engine oil capacity | 3.4 liters (3.6 US.qts, 3.0 Imp. qts) |
| Oil change interval, km (miles) | 5,000-10,000 (3,000-6,000) |
| Ignition system | |
| Spark plug | Champion RC9MCC |
| Spark Plug Wire | Champion LS-34 |
Vehicle applications
| Model | Years Produced |
| Nissan Avenir W10 | 1990-1992 |
| Nissan Bluebird U12 | 1989-1991 |
| Nissan Primera P10 | 1990–1993 |
| Nissan Presea R10 | 1990–1992 |
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