Nissan SR18Di

SR18DiThe 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 codeSR18Di
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline
Displacement1.8L, 1,838 cc (112.1 cu-in)
Power output110.0 PS (81.0 kW; 108.0 HP) at 6,500 rpm
Torque output150.0 Nm (15.3 kg·m; 110.7 lbf·ft) at 4,000 rpm
Fuel systemSingle Point Fuel Injection
Power adderNone
Cooling systemLiquid-cooling
Firing order1-3-4-2
Dimensions (L x H x W):
Weight330 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 alloyCast 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 alloyAluminum
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 capacity3.4 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 plugChampion RC9MCC
Spark Plug WireChampion LS-34

Vehicle applications

ModelYears Produced
Nissan Avenir W101990-1992
Nissan Bluebird U121989-1991
Nissan Primera P101990–1993
Nissan Presea R101990–1992
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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