The 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 code | 1S-i, 1S-iL, 1S-iLU |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline |
| Production | 1984- |
| Displacement | 1.8 L, 1,832 cm3 (111.8 cu in) |
| Fuel system | Central injection |
| Power adder | None |
| 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 order | 1-3-4-2 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
| Cylinder block | ||
| Cylinder block alloy | Cast-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: | Top | 0.030-0.070 mm (0.0012-0.0028 in) |
| Second | 0.030-0.070 mm (0.0012-0.0028 in) | |
| Piston ring end gap: | Top | 0.270-0.500 mm (0.0106-0.0197 in) |
| Second | 0.200-0.450 mm (0.0079-0.0177 in) | |
| Oil | 0.200-0.790 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 alloy | Aluminum | |
| Valve Arrangement: | SOHC | |
| Valves: | 8 (2 valves per cylinder) | |
| Valve length: | INTAKE | 109.7 mm (4.319 in) |
| EXHAUST | 109.3 mm (4.303 in) | |
| Valve stem diameter: | INTAKE | 7.970-7.985 mm (0.3138-0.3144 in) |
| EXHAUST | 7.965-7.980 mm (0.3136-0.3142 in) | |
| Valve spring free length: | INTAKE | 46.71 mm (1.8390 in) |
| EXHAUST | 46.71 mm (1.8390 in) | |
| Camshaft lobe height: | INTAKE | 38.926-38.026 mm (1.5325-1.5365 in) |
| EXHAUST | 38.926-38.026 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 | |
| Standard | 12.5 kg/cm2 (1,226 kPa, 178 psi) / 250 rpm |
| Minimun | 9.0 kg/cm2 (883 kPa, 128 psi) / 250 rpm |
| Differential limit between cylinders | 1.0 kg/cm2 (98 kPa, 14 psi) / 250 rpm |
| Oil system | |
| Recommended engine oil | 5W-30, 10W-30, 10W-40 |
| Oil type API | SF, 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 plug | NGK: BRE527Y-11 ND: J16AR-11 |
| Spark plug gap | 1.1 mm (0.043 in) |
| Spark plug tightening torque | 18 Nm (1.8 kg⋅m, 13 ft⋅lb) |
Vehicle applications
| Model | Years 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) | – |
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