Suzuki G16B

Suzuki G16BThe Suzuki G16B is a 1.6 L (1,590 cc, 97.03 cu·in) straight-four 4-stroke natural aspirated gasoline engine from the Suzuki G-family. The G16B engine was manufactured by Suzuki Motor Corporation.

The Suzuki G16B engine features an aluminum cylinder block with wet liners and aluminum cylinder head with single overhead camshafts (SOHC) and four valves per cylinder (16 in total). Cylinder bore and piston stroke are 75.0 mm (2.95 in) and 90.0 mm (3.54 in), respectively. Compression ratio rating is 9.5:1. The G16B engine is equipped with Multi-point fuel injection (MPFI) and electronic ignition system with one ignition coil for two spark plugs.

This engine produced from 94 PS (69 kW; 93 HP) at 5,600 rpm to 97 PS (71 kW; 95 HP) at 5,600 rpm of maximum horsepower and from 132 N·m (13.5 kg·m, 97.3 ft·lb) at 4,000 rpm to 140 N·m (14.3 kg·m, 103.2 ft·lb) at 4,000 rpm of peak torque.

The breakdown of the engine code is as follows:

  • G – Engine family
  • 16 – 1.6 Liter Displacement

General information

Engine Specifications
Engine codeG16B
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production
Displacement1.6 L, 1,590 cm3 (97.03 cu in)
Fuel systemMulti-point fuel injection
Power adderNone
Power output From 94 PS (69 kW; 93 HP) at 5,600 rpm
to 97 PS (71 kW; 95 HP) at 5,600 rpm
Torque output From 132 N·m (13.5 kg·m, 97.3 ft·lb) at 4,000 rpm
to 140 N·m (14.3 kg·m, 103.2 ft·lb) at 4,000 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight

Cylinder block

The Suzuki G16B cylinder block is made of cast aluminum alloy and has 4 cylinders arranged “In-Line”. A cylindrical cast iron sleeve is installed in each cylinder. It has a 75.0 mm (2.95 in) cylinder bore and 90.0 mm (3.54 in) piston stroke. Compression ratio rating is 9.5:1.

A monoblock casting crankshaft is supported by five main bearings. The piston is cast aluminum alloy and has two compression rings and one oil ring. Piston pins are made of chromium steel and have a floating fit in the pistons and in the connecting rods. The connecting rods are made of forged steel, and the rod bearings are of precision insert type.

Cylinder block (Suzuki Grang Vitara specs)
Cylinder block alloyAluminum
Compression ratio:9.5:1
Cylinder bore:75.0 mm (2.95 in)
Piston stroke:90.0 mm (3.54 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):75.000-75.014 mm (2.9528-2.9533 in)
Piston skirt diameter (standard):74.970-74.990 mm (2.9516-2.9524 in)
Piston pin outer diameter:18.995-19.000 mm (0.7478-0.748 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)
Piston ring end gap:Top0.200-0.350 mm (0.0079-0.0138 in)
Second0.200-0.350 mm (0.0079-0.0138 in)
Oil0.200-0.700 mm (0.0079-0.0276 in)
Crankshaft main journal diameter:51.992-52.000 mm (2.0469-2.0472 in)
Crankpin diameter:43.982-44.000 mm (1.7316-1.7323 in)

Main bearing cap bolts tightening procedure and torque specs:

  • 54 Nm; 5.4 kg·m; 39.0 ft·lb

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

Connecting rod bearing

  • 35 Nm; 3.5 kg·m; 22.0 ft·lb

Cylinder head

The cylinder head is made of an aluminum casting which gives it good cooling efficiency. The supporting part of the camshaft is an independent cap type. The engine has a single overhead camshaft design with four valves per cylinder. The combustion chamber used the center plug type pent roof shape for higher intake and exhaust efficiency. The Suzuki G16B engine did not have hydraulic lifters, so special valve shims are used to adjust the valve clearance.

Cylinder head
Valve Arrangement:SOHC, chain drive
Valves:16 (4 valves per cylinder)
Valve stem diameter:INTAKE5.465-5.480 mm (0.2152-0.2157 in)
EXHAUST5.440-5.455 mm (0.2142-0.2148 in)
Valve spring free length:36.83 mm (1.45 in)
Camshaft cam height:INTAKE36.184-36.344 mm (1.4246-1.4309 in)
EXHAUST35.900-36.060 mm (1.4134-1.4197 in)

Head tightening procedure and torque specs:

  • Step 1: 35 Nm; 3.5 kg·m; 25.0 ft·lb
  • Step 2: 55 Nm; 5.5 kg·m; 40.0 ft·lb
  • Step 3: 68 Nm; 6.8 kg·m; 49.5 ft·lb

Maintenance data

Valve clearance (Cold)
Intake valve0.13-0.17 mm (0.0051-0.0067 in)
Exhaust valve0.23-0.27 mm (0.0091-0.0106 in)
Valve clearance (Hot)
Intake valve0.17-0.21 mm (0.0067-0.0083 in)
Exhaust valve0.27-0.31 mm (0.0106-0.0122 in)
Compression pressure
Standard14.0 kg/cm2 / 200 rpm
Minimun11.0 kg/cm2 / 200 rpm
Compression differential limit between cylinders1.0 kg/cm2 / 200 rpm
Oil system
Recommended engine oil5W-30, 10W-30
Oil type APISG, SH, SJ, SL or SM
Engine oil capacity (Refill capacity)~ 3.3-3.5 L
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Oil presure: 3.3-4.3 kg/cm2 (330-430 kPa; 46.9 – 61.1 psi) at 4,000 rpm
Ignition system
Spark plugNGK: BKR6E-11 DENSO: K20PR-U11
Spark plug gap1.0-1.1 mm (0.0394-0.0433 in)
Spark plug tightening torque28 N·m (2.9 kg·m, 20.6 ft·lb)

Vehicle applications

ModelYears Produced
Suzuki Escudo
Suzuki Esteem1992–1997
Suzuki Cultus Crescent1995–2002
Geo Tracker
Suzuki Sidekick
Suzuki X-90
Suzuki Swift
Suzuki Vitara
Suzuki Boleno
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