Suzuki M16A

Suzuki M16AThe Suzuki M16A is a 1.6 L (1,586 cc, 96.8 cu·in) straight-four 4-stroke natural aspirated gasoline engine from the Suzuki M-family. The M16A engine was manufactured by Suzuki Motor Corporation.

The Suzuki M16A engine features an aluminum cylinder block with wet liners and aluminum cylinder head with two overhead camshafts (DOHC) and four valves per cylinder (16 in total). A 78.0 mm (3.07 in) cylinder bore and 83.0 mm (3.27 in) piston stroke give the M16A engine a total of 1,586 cc (96.8 cu·in) of displacement. Compression ratio rating is 10.5:1 or 11.1:1.

The M16A 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 one ignition coil for two spark plugs.

This engine produced from 106 PS (78 kW; 105 HP) at 5,900 rpm to 136 PS (100 kW; 134 HP) at 6,900 rpm of maximum horsepower and from 145 N·m (14.8 kg·m, 106.9 ft·lb) at 4,100 rpm to 160 N·m (16.3 kg·m, 117.9 ft·lb) at 4,400 rpm of peak torque.

The breakdown of the engine code is as follows:

  • M – Engine family
  • 16 – 1.6 Liter Displacement

General information

Engine Specifications
Engine codeM16A
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Displacement1.6 L, 1,586 cm3 (96.8 cu in)
Fuel systemMulti-point fuel injection (MPFI)
Power adderNone
Power output From 106 PS (78 kW; 105 HP) at 5,900 rpm
to 136 PS (100 kW; 134 HP) at 6,900 rpm
Torque output From 145 N·m (14.8 kg·m, 106.9 ft·lb) at 4,100 rpm
to 160 N·m (16.3 kg·m, 117.9 ft·lb) at 4,400 rpm
Firing order1-3-4-2
Dimensions (L x W x H):

Cylinder block

The Suzuki M16A has an aluminum cylinder block with five bearing support system and wet liners. It has a 78.0 mm (3.07 in) cylinder bore and 83.0 mm (3.27 in) piston stroke. The engine has two compression and single oil control ring. Compression ratio rating is 10.5:1 or 11.1:1.

Cylinder block (Suzuki Grang Vitara specs)
Cylinder block alloyAluminum
Compression ratio:10.5:1 or 11.1:1
Cylinder bore:78.0 mm (3.07 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):78.000-78.014 mm (3.0709-3.0714 in)
Piston skirt diameter (standard):77.953-77.968 mm (3.069-3.0696 in)
Piston pin outer diameter:19.997-20.000 mm (0.7873-0.7874 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)
Oil0.030-0.170 mm (0.0012-0.0067 in)
Piston ring end gap:Top0.200-0.350 mm (0.0079-0.0138 in)
Second0.350-0.500 mm (0.0138-0.0197 in)
Oil0.200-0.700 mm (0.0079-0.0276 in)
Crankshaft journal diameter:51.994-52.000 mm (2.047-2.0472 in)
Crankpin diameter:41.982-42.000 mm (1.6528-1.6535 in)

Main bearing cap bolts tightening procedure and torque specs:
No.1 bolt (1-10)

  • Step 1: 30 Nm; 3.0 kg·m; 22.0 ft·lb
  • Step 2: 50 Nm; 5.0 kg·m; 36.5 ft·lb
  • Step 3: Turn all bolts 60°

No.2 bolt (11-20)

  • Step 1: 25 Nm; 2.5 kg·m; 18.0 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 M16A engine used Variable Valve Timing system (VVT) on the intake camshaft. Intake valves are 37.0 mm (1.4567 in) in diameter, and the exhaust valves are 25.0 mm (0.9843 in). This engine did not have hydraulic lifters, so special valve shims are used to adjust the valve clearance.

Cylinder head
Valve Arrangement:DOHC, chain drive
Valves:16 (4 valves per cylinder)
Valve head diameter:INTAKE37.0 mm (1.4567 in)
EXHAUST25.0 mm (0.9843 in)
Valve length:INTAKE100.70 mm (3.9646 in)
EXHAUST99.00 mm (3.8976 in)
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:INTAKE44.929-45.089 mm (1.7689-1.7752 in)
EXHAUST44.399-44.559 mm (1.748-1.7543 in)
Camshaft journal diameter:№1 Intake: 26.940-26.955 mm (1.0606-1.0612 in)
Exhaust: 26.934-26.955 mm (1.0604-1.0612 in)
Other journals diameter22.934-22.955 mm (0.9029-0.9037 in)

Head tightening procedure and torque specs:
For M8 bolts:

  • Step 1: 25 Nm (2.5 kg·m, 18.4 ft·lb)

For M10 bolts:

  • Step 1: 20 Nm; 2.0 kg·m; 14.5 ft·lb
  • Step 1: 40 Nm; 4.0 kg·m; 29.0 ft·lb
  • Step 2: Turn all bolts 60°
  • Step 3: Turn all bolts another 60°

Maintenance data

Valve clearance (Cold)
Intake valve0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve0.28-0.32 mm (0.011-0.0126 in)
Valve clearance (Hot)
Intake valve0.21-0.27 mm (0.0083-0.0106 in)
Exhaust valve0.30-0.36 mm (0.0118-0.0142 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
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, SL or SM
Engine oil capacity (Refill capacity)~ 4.5 L (4.76 US. qt, 3.96 Imp. qt.)
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Ignition system
Spark plugNGK: BKR6E-11 (Nickel), IFR6J11 (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 SX4
Suzuki SX4 S-Cross
Suzuki Liana
Suzuki Grand Vitara
Suzuki Swift
Fiat Sedici
Suzuki Alivio
Suzuki Vitara / Escudo
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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