Nissan SR18DE

Nissan SR18DEThe Nissan SR18DE is a 1.8 l (1,838 cc, 112.2 cu·in) straight-four gasoline engine from SR-family manufactured by Nissan Motors.

The SR18DE has an aluminum cylinder block and head, DOHC design (four valves per cylinder with two camshafts driven by timing chain) and multi-point fuel injection system. An 82.5 mm (3.25 in) cylinder bore and 86.0 mm (3.39 in) piston stroke give the SR18DE engine a total of 1838 cc of displacement. Compression ratio rating is 9.5:1. This engine has a version with the Lean Burn.

The Nissan SR18DE engine produced from 125.0 PS (92 kW; 123.0 HP) at 6,000 rpm to 140.0 PS (103 kW; 138.0 HP) at 6,400 rpm of maximum output power and from 156 N·m (15.9 kg·m, 115 ft·lb) at 4,800 rpm to 167 N·m (17 kg·m, 123.1 ft·lb) at 4,800 rpm of peak torque.

The breakdown of the engine code is as follows:

  • SR – Engine Family
  • 18 – 1.8 Liter Displacement
  • D – DOHC (Dual Overhead Camshafts)
  • E – Electronic Fuel Injection

General information

Engine Specifications
Engine codeSR18DE
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Displacement1.8 L, 1,838 cc (112.2 cu in)
Fuel systemMulti Point Fuel Injection
Power adderNone
Power output From 125.0 PS (92 kW; 123.0 HP) at 6,000 rpm
to 140.0 PS (103 kW; 138.0 HP) at 6,400 rpm
Torque output From 156 N·m (15.9 kg·m, 115 ft·lb) at 4,800 rpm
to 167 N·m (17 kg·m, 123.1 ft·lb) at 4,800 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight~ 139 kg (306 lbs)

Cylinder block

Cylinder block
Cylinder block alloyAluminium
Compression ratio:9.5:1
Cylinder bore:82.5 mm (3.25 in)
Piston stroke:86.0 mm (3.39 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):82.500-82.530 mm (3.248-3.2492 in)
Piston skirt diameter (standard):82.480-82.510 mm (3.2472-3.2484 in)
Piston pin outer diameter:22.000 mm (0.8661 in)
Piston ring side clearance:Top0.040-0.080 mm (0.0016-0.0031 in)
Second0.040-0.080 mm (0.0016-0.0031 in)
Oil0.035-0.115 mm (0.0014-0.0045 in)
Piston ring end gap:Top0.200-0.490 mm (0.0079-0.0193 in)
Second0.200-0.490 mm (0.0079-0.0193 in)
Oil0.200-0.690 mm (0.0079-0.0272 in)
Crankshaft main journal diameter:54.974-54.980 mm (2.1643-2.1646 in)
Crankpin diameter:47.968-47.974 mm (1.8885-1.8887 in)

Tightening procedure and torque specs

Main bearings (from center to sides):

  • Step 1: 32-38 Nm; 3.3-3.9 kg·m; 24-28 ft·lb
  • Step 2: Turn all bolts 45-50° or 73-82 Nm; 7.4-8.4 kg·m; 84-61 ft·lb

Connecting rods cups:

  • Step 1: 14-16 Nm; 1.4-1.6 kg·m; 10-12 ft·lb
  • Step 2: Turn all bolts 60-65° or 38-44 Nm; 3.9-4.5 kg·m; 28-33 ft·lb

Flywheel to Crankshaft:

  • 83-94 Nm; 8.5-9.6 kg·m; 61-69 ft·lb

Cylinder head

Cylinder block alloyAluminium
Valve timing:INTAKE
Valve head diameter:INTAKE32.0-32.3 mm (1.2598-1.2717 in)
EXHAUST28.0-28.3 mm (1.1024-1.1142 in)
Valve length:INTAKE98.4 mm (3.874 in)
EXHAUST99.32 mm (3.9102 in)
Valve stem diameter:INTAKE5.965-5.980 mm (0.2348-0.2354 in)
EXHAUST5.945-5.960 mm (0.2341-0.2346 in)
Valve spring free length:47.5 mm (1.8701 in)

Head tightening procedure and torque specs:

  • Step 1: 39 Nm; 4.0 kg·m; 29 ft·lb
  • Step 2: 78 Nm; 8.0 kg·m; 58 ft·lb
  • Step 3: Loosen all bolts completely
  • Step 4: 39±5 Nm; 4.0±0.5 kg·m; 29±3.6 ft·lb
  • Step 5: Turn all bolts 90°
  • Step 6: Turn all bolts another 90°

Maintenance data

Compression pressure
Standard SR18DE: 11.2 kg/cm2 (160 psi) / 300 rpm
SR18DE Lean Burn: 13.0 kg/cm2 (191 psi) / 300 rpm
Minimun10.0 kg/cm2 (149 psi) / 300 rpm
Compression differential limit between cylinders1.0 kg/cm2 (15 psi) / 300 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil For positively improve fuel economy: 5W-30
For warm and cold areas: 10W-30
For hot areas: 20W-40 and 20W-50
Oil type APISF, SG, SH or SJ
Engine oil capacity (Refill capacity) With filter change 3.6 l
Without filter change 3.4 l
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Oil Pressure, kPa (kg/cm 2, psi) Idle speed: More than 78 (0.8, 11)
3,200 rpm: 314-392 (3.2-4.0, 46-75)
Ignition system
Spark plug Standard: BKR5E-11 (NGK); RC10YC4 (Champion)
Hot: BKR4E-11 (NGK)
Cold: BKR6E-11 (NGK)
Spark plug gap1.0-1.1 mm (0.0394-0.0433 in)
Spark plug tightening torque20-29 Nm; 2.0-3.0 kg·m; 14-22 ft-lb

Vehicle applications

ModelYears Produced
Nissan Primera1991-1997
Nissan Sunny
Nissan Avenir (W10)
Nissan Rasheen
Nissan Bluebird (U13)1991-1997
Nissan Bluebird (U14)1989-1998
Nissan Pulsar GTi (B13 and N14)1990-1993
Nissan Pulsar GTi (N15)1991-1999
Nissan Presea1989-2001
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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