The 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 code | SR18DE |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline (petrol) |
| Production | 1989-2001 |
| Displacement | 1.8 L, 1,838 cc (112.2 cu in) |
| Fuel system | Multi Point Fuel Injection |
| Power adder | None |
| 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 order | 1-3-4-2 |
| Dimensions (L x W x H): | – |
| Weight | ~ 139 kg (306 lbs) |
Cylinder block
| Cylinder block | ||
| Cylinder block alloy | Aluminium | |
| 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: | Top | 0.040-0.080 mm (0.0016-0.0031 in) |
| Second | 0.040-0.080 mm (0.0016-0.0031 in) | |
| Oil | 0.035-0.115 mm (0.0014-0.0045 in) | |
| Piston ring end gap: | Top | 0.200-0.490 mm (0.0079-0.0193 in) |
| Second | 0.200-0.490 mm (0.0079-0.0193 in) | |
| Oil | 0.200-0.690 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 alloy | Aluminium | |
| Valve timing: | INTAKE | – |
| EXHAUST | – | |
| Valve head diameter: | INTAKE | 32.0-32.3 mm (1.2598-1.2717 in) |
| EXHAUST | 28.0-28.3 mm (1.1024-1.1142 in) | |
| Valve length: | INTAKE | 98.4 mm (3.874 in) |
| EXHAUST | 99.32 mm (3.9102 in) | |
| Valve stem diameter: | INTAKE | 5.965-5.980 mm (0.2348-0.2354 in) |
| EXHAUST | 5.945-5.960 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 |
| Minimun | 10.0 kg/cm2 (149 psi) / 300 rpm |
| Compression differential limit between cylinders | 1.0 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 API | SF, 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 gap | 1.0-1.1 mm (0.0394-0.0433 in) |
| Spark plug tightening torque | 20-29 Nm; 2.0-3.0 kg·m; 14-22 ft-lb |
Vehicle applications
| Model | Years Produced |
| Nissan Primera | 1991-1997 |
| 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 Presea | 1989-2001 |
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