Suzuki J20

The Suzuki J20 is a 2.0 L (1,995 cc, 121.74) straight-four 4-stroke natural aspirated gasoline engine from the Suzuki J-family. The J20 engine was manufactured by Suzuki Motor Corporation.

The J20 engine features an aluminum cylinder block and aluminum cylinder head with two overhead camshafts (DOHC) and four valves per cylinder (16 in total). It has an 84.0 mm (3.31 in) cylinder bore and 90.0 mm (3.54 in) piston stroke. Compression ratio rating is 9.7:1.

The Suzuki J20 engine is equipped with Multi-point fuel injection (MPFI), VVT (Variable Valve Timing) system on the intake side, ETCS (Electronic Throttle Control System) and electronic ignition system with individual ignition coil for each spark plug.

The J20 engine produced 130 PS (95 kW; 127 HP) at 6,000 rpm of maximum horsepower and 182 N·m (18.6 kg·m, 134 ft·lb) at 3,000 rpm of maximum torque.

The breakdown of the engine code is as follows:

• J – Engine family
• 20 – 2.0 Liter Displacement

General information

Cylinder block

The Suzuki J20 has an aluminum cylinder block with five bearing support system. It has an 84.0 mm (3.31 in) cylinder bore and 90.0 mm (3.54 in) piston stroke. The engine has two compression and single oil control ring. Compression ratio rating is 9.7:1.

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: 15 Nm; 1.5 kg·m; 11 ft·lb
• Step 2: Turn bolts 45°
• Step 3: Turn bolts another 45°

Cylinder head

The cylinder head is made of aluminum alloy which gives it good cooling efficiency. 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. The J20 engine used Variable Valve Timing System (VVT) on the intake camshaft. Intake valves are 33.0 mm (1.2992 in) in diameter, and the exhaust valves are 28.0 mm (1.1024 in). This engine did not have hydraulic lifters, so special valve shims are used to adjust the valve clearance.

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: 52 Nm; 5.2 kg·m; 38.0 ft·lb
• Step 2: 82 Nm; 8.2 kg·m; 59.2 ft·lb
• Step 3: 0 Nm; 0 kg·m; 0 ft·lb
• Step 4: 52 Nm; 5.2 kg·m; 38.0 ft·lb
• Step 5: 103 Nm; 10.3 kg·m; 74.5 ft·lb

Maintenance data

Vehicle applications

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