Toyota 1S-i, 1S-iL, 1S-iLU

Toyota 1S-i, 1S-iL, 1S-iLUThe Toyota 1S-i, 1S-iL, 1s-iLU is a 1.8 liter (1,832 cc, 111.8 cu-in) straight-four, four-stroke gasoline engine from Toyota S-family, manufactured by Toyota Motor Corporation since 1984.

This engine used SOHC (single overhead camshaft) design with two valves per cylinder (8 valves in total), cast-iron cylinder block, an aluminium cylinder head, single-point injection system with electronic control (central injection) and ignition system with mechanical distributor.

The 1S-i motor has an 80.5 mm (3.17 in) cylinder bore and 90.0 mm (3.54 in) of piston stroke. Compression ratio rating is 9.0:1

This engine may have had the following markings:

  • The 1S-iL designed for transverse, front-wheel-drive applications
  • The 1S-iLU Japanese emissions controls
  • The 1S-i later versions
  • The 1S-Ci sometimes found in marketing materials

The Toyota 1S-iL engine produced 86.0 PS (63 KW; 84.5 HP) at 5,200 rpm or 105.0 PS (77 KW; 103.5 HP) at 5,400 rpm of horsepower and from 142 Nm (14.5 kg·m; 104.8 ft·lb) at 3,000 rpm to 160 Nm (16.3 kg·m; 118.1 ft·lb) at 3,000 rpm of peak torque.

The breakdown of the engine code is as follows:

  • 1 – 1st generation engine
  • S – Engine family
  • i – Single-point injection system
  • L – Designed for transverse front-wheel-drive applications
  • U – Japanese emissions controls

General information

Engine Specifications
Engine code1S-i, 1S-iL, 1S-iLU
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline
Displacement1.8 L, 1,832 cm3 (111.8 cu in)
Fuel systemCentral injection
Power adderNone
Max. horsepower 86.0 PS (63 KW; 84.5 HP) at 5,200 rpm
105.0 PS (77 KW; 103.5 HP) at 5,400 rpm
Max. torque 142 Nm (14.5 kg·m; 104.8 ft·lb) at 3,000 rpm
157 Nm (16.0 kg·m; 115.9 ft·lb) at 3,000 rpm
160 Nm (16.3 kg·m; 118.1 ft·lb) at 3,000 rpm
Firing order1-3-4-2
Dimensions (L x H x W):

Cylinder block

Cylinder block
Cylinder block alloyCast-iron
Compression ratio:9.0:1
Cylinder bore:80.5 mm (3.17 in)
Piston stroke:90.0 mm (3.54 in)
Number of piston rings (compression / oil):2 / 1
Cylinder inner diameter (standard):80.500-80.530 mm (3.1693-3.1705 in)
Piston skirt diameter (standard):80.443-80.473 mm (3.1670-3.1682 in)
Piston pin diameter (standard):
Piston ring side clearance:Top0.030-0.070 mm (0.0012-0.0028 in)
Second0.030-0.070 mm (0.0012-0.0028 in)
Piston ring end gap:Top0.270-0.500 mm (0.0106-0.0197 in)
Second0.200-0.450 mm (0.0079-0.0177 in)
Oil0.200-0.790 mm (0.0079-0.0311 in)
Crankshaft main journal diameter:54.985-55.000 mm (2.1648-2.1653 in)
Crankpin diameter:47.985-48.000 mm (1.8892-1.8898 in)

Main bearing cap bolts tightening procedure and torque specs:

  • 60 Nm; 6.1 kg·m; 44 ft·lb

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

Connecting rod bearing bolts

  • 49 Nm (5.0 kgf·m; 36.2 ft·lb)

Cylinder head

Cylinder head
Cylinder head alloyAluminum
Valve Arrangement:SOHC
Valves:8 (2 valves per cylinder)
Valve length:INTAKE109.7 mm (4.319 in)
EXHAUST109.3 mm (4.303 in)
Valve stem diameter:INTAKE7.970-7.985 mm (0.3138-0.3144 in)
EXHAUST7.965-7.980 mm (0.3136-0.3142 in)
Valve spring free length:INTAKE46.71 mm (1.8390 in)
EXHAUST46.71 mm (1.8390 in)
Camshaft lobe height:INTAKE38.926-38.026 mm (1.5325-1.5365 in)
EXHAUST38.926-38.026 mm (1.5325-1.5365 in)
Camshaft journal diametr: No.1: 46.459-46.475 mm (1.8291-1.8297 in)
No.2: 46.209-46.225 mm (1.8192-1.8199 in)
No.3: 45.959-45.975 mm (1.8094-1.8100 in)
No.4: 45.709-45.725 mm (1.7996-1.8002 in)
No.5: 45.459-45.475 mm (1.7897-1.7904 in)
No.6: 45.209-45.225 mm (1.7799-1.7805 in)

Maintenance data

Compression pressure
Standard12.5 kg/cm2 (1,226 kPa, 178 psi) / 250 rpm
Minimun9.0 kg/cm2 (883 kPa, 128 psi) / 250 rpm
Differential limit between cylinders1.0 kg/cm2 (98 kPa, 14 psi) / 250 rpm
Oil system
Recommended engine oil5W-30, 10W-30, 10W-40
Oil type APISF, SG or higher
Engine oil capacity (Refill capacity) With oil filter: 4.0 liters (4.23 US.qts, 3.52 Imp. qts)
Without oil filter: 3.6 liters (3.8 US.qts, 3.17 Imp. qts)
Ignition system
Spark plugNGK: BRE527Y-11 ND: J16AR-11
Spark plug gap1.1 mm (0.043 in)
Spark plug tightening torque18 Nm (1.8 kg⋅m, 13 ft⋅lb)

Vehicle applications

ModelYears Produced
Toyota Camry (SV10)
Toyota Vista (SV10)
Toyota Camry (SV20)
Toyota Vista (SV20)
Toyota Carina (ST150)
Toyota Carina ED (ST160)
Toyota Celica (ST160)
Toyota Corona (ST150)
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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