Suzuki J18

Suzuki J18The Suzuki J18 / J18A is a 1.8 L (1,840 cc, 112.3 cu·in) straight-four 4-stroke natural aspirated gasoline engine from the Suzuki J-family. The J18 engine was manufactured by Suzuki Motor Corporation.

The Suzuki J18 engine features an aluminum cylinder block and aluminum cylinder head with two overhead camshafts (DOHC) and four valves per cylinder (16 in total). Cylinder bore and piston stroke are 84.0 mm (3.31 in) and 83.0 mm (3.27 in), respectively. Compression ratio rating is 9.8:1.

The Suzuki J18 engine is equipped with Multi-point fuel injection and electronic ignition system with individual ignition coil for each spark plug.

The J18 engine produced 121 PS (89 kW; 120 HP) at 6,200 rpm of maximum horsepower and 152 N·m (15.5 kg·m, 112 ft·lb) at 3,400 rpm of peak torque.

The breakdown of the engine code is as follows:

  • J – Engine family
  • 18 – 1.8 Liter Displacement

General information

Engine Specifications
Engine codeJ18 / J18A
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Displacement1.8 L, 1,840 cm3 (112.3 cu in)
Fuel systemMulti-point fuel injection (MPFI)
Power adderNone
Power output121 PS (89 kW; 120 HP) at 6,200 rpm
Torque output152 N·m (15.5 kg·m, 112 ft·lb) at 3,400 rpm
Firing order1-3-4-2
Dimensions (L x W x H):

Cylinder block

The Suzuki J18 has an aluminum cylinder block with five bearing support system. A cylindrical cast iron sleeve is installed in each cylinder. It has an 84.0 mm (3.31 in) cylinder bore and 83.0 mm (3.27 in) piston stroke. Compression ratio rating is 9.8:1. The piston is cast aluminum alloy and has two compression rings (top and 2nd rings), and one oil ring.

Cylinder block
Cylinder block alloyAluminum
Compression ratio:9.8:1
Cylinder bore:84.0 mm (3.31 in)
Piston stroke:83.0 mm (3.27 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):84.000-84.010 mm (3.3071-3.3075 in)
Piston skirt diameter (standard):83.970-83.980 mm (3.3059-3.3063 in)
Piston pin outer diameter:20.997-21.000 mm (0.8267-0.8268 in)
Piston ring side clearance:Top0.030-0.070 mm (0.0012-0.0028 in)
Second0.020-0.060 mm (0.0008-0.0024 in)
Oil0.060-0.150 mm (0.0024-0.0059 in)
Piston ring end gap:Top0.200-0.330 mm (0.0079-0.013 in)
Second0.350-0.500 mm (0.0138-0.0197 in)
Oil0.200-0.700 mm (0.0079-0.0276 in)
Crankshaft main journal diameter:58.000 mm (2.2835 in)
Crankpin diameter:50.000 mm (1.9685 in)

Crankcase bolts tightening procedure and torque specs:
10 mm

  • Step 1: 40 Nm; 4.0 kg·m; 29.0 ft·lb
  • Step 2: 0 Nm; 0 kg·m; 0 ft·lb
  • Step 3: 40 Nm; 4.0 kg·m; 29.0 ft·lb
  • Step 4: 58 Nm; 4.8 kg·m; 42.0 ft·lb

8 mm

  • Step 1: 26 Nm; 2.6 kg·m; 19.0 ft·lb

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing bolts

  • Step 1: 45 Nm; 4.5 kg·m; 33 ft·lb

Cylinder head

The cylinder head is made of aluminum alloy which gives it good cooling efficiency. The combustion chamber is pent roof type and a spark plug is positioned in the center of the combustion chamber and between intake ports and exhaust ports. The engine has dual overhead camshaft design with four valves per cylinder. The double overhead camshaft is mounted over the cylinder head; it is driven from the crankshaft through timing chains, and no pushrods are provided in the valve train system. Intake valves are 33.0 mm (1.2992 in) in diameter, and the exhaust valves are 28.0 mm (1.1024 in).

The Suzuki J18 used hydraulic valve lash adjusters. The hydraulic valve lash adjuster, located between the camshaft and valve stem, is direct-acting type. With the engine oil delivered into it from the oil pump, the adjuster operates as follows so as to adjust the valve lash (clearance) to “zero” automatically at all time.

Cylinder head
Valve Arrangement:DOHC, chain drive
Valves:16 (4 valves per cylinder)
Valve head diameter:INTAKE33.0 mm (1.2992 in)
EXHAUST28.0 mm (1.1024 in)
Valve length:INTAKE86.30 mm (3.3976 in)
EXHAUST85.90 mm (3.3819 in)
Valve stem diameter:INTAKE5.965-5.980 mm (0.2348-0.2354 in)
EXHAUST5.940-5.955 mm (0.2339-0.2344 in)
Valve spring free length: Inner: 36.08 mm (1.4205 in)
Outer: 40.44 mm (1.5921 in)
Camshaft cam height:INTAKE40.428-40.588 mm (1.5917-1.5979 in)
EXHAUST39.922-40.082 mm (1.5717-1.578 in)
Camshaft journal diameter:25.937-25.955 mm (1.0211-1.0218 in)

Head tightening procedure and torque specs:
For M6 bolts:

  • Step 1: 11 Nm (1.1 kg·m, 8.0 ft·lb)

For M10 bolts:

  • Step 1: 53 Nm; 5.3 kg·m; 38.5 ft·lb
  • Step 2: 84 Nm; 8.4 kg·m; 61.0 ft·lb
  • Step 3: Loosen all bolts to 0 Nm; 0 kg·m; 0 ft·lb
  • Step 4: 53 Nm; 5.3 kg·m; 38.5 ft·lb
  • Step 5: 105 Nm; 10.5 kg·m; 76.0 ft·lb

Maintenance data

Compression pressure
Standard14.0 kg/cm2 / 200 rpm
Minimun12.0 kg/cm2 / 200 rpm
Compression differential limit between cylinders1.0 kg/cm2 / 200 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil5W-30, 10W-30
Oil type APISG, SH, SJ
Engine oil capacity (Refill capacity)~ 4.7-5.0 L
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Ignition system
Spark plugNGK: BKR6E-11 (Nickel), IFR5J11 (Iridium); DENSO: K20PR-U11 (Nickel)
Spark plug gap1.0-1.1 mm (0.0394-0.0433 in)
Spark plug tightening torque25 N·m (2.5 kg·m, 18.4 ft·lb)

Vehicle applications

ModelYears Produced
Suzuki Esteem1998–2002
Suzuki Escudo / Vitara1998–2000
Suzuki Boleno1998–2002
Suzuki Cultus Crescent Wagon1996–2002
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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  1. Hello. I have a suzuki baleno that came with G13 engine. Now i want to swap that with j18. Wanted to knw if that wud require me to change the ecu of the car, or have it reset somehow, as i am going for that big a difference ?


  3. Buenas noches, quisiera saber cual empaque de cabeza lleva originalmente este motor J18 de Suzuki Sidekick Sport, si lleva uno de grafito o un empaque laminado. Agradecería su respuesta

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