R18A2 engine — FN 1.8 (1.8L)
1.8L · 140 hp
Engine overview
Vehicles with this engine
Factory specifications
Values from the manufacturer documentation for this engine.
Engine (general)
| Engine code | R18A2 |
| Capacity | 1799 cc |
| Idle speed | 670 ± 50 (750 ± 50) rpm |
| Inlet | 0.20 ± 0.02 mm |
| Exhaust | 0.25 ± 0.02 mm |
| Minimum | 8.8 bar |
| Differential limit between cylinders | < 2.0 bar |
| Oil pressure | 0.7 / 670 ± 50 3.4 / 3000 bar/rpm |
Engine (petrol)
| Fuel system (make and type) | PGM-FI |
| Number of cylinders | 4 |
| Firing order | 1-3-4-2 |
| Timing stroboscopic (before TDC) | 8 ± 2 / 670 ± 50 °/rpm |
| Spark plugs (make and type) | NGK IZFR6K11S Denso SKJ20DR-M11S |
| Spark plug gap | 1.0 - 1.1 mm |
| Injection pressure/system pressure | 3.8 - 4.3 bar |
| CO exhaust gas | < 0.1 % |
| Lambda | 0.97 – 1.03 |
| CO at fast-idle speed | < 0.3 % |
Cooling system
| Cap pressure | 0.93 - 1.23 bar |
| Thermostat opens at | 82 ± 2 °C |
| Thermostat fully open at | 95 °C |
Electrical
| Battery | 45 Ah |
| Alternator | 90 A |
Capacities
| Engine sump, incl. filter | 3.7 l |
| Manual transmission | PHE4 |
| Gearbox refill | 1.4 l |
| Cooling system | 5.3 l |
| Air-conditioner refrigerant | 465 ± 25 g |
| Air-conditioner compressor oil | 80 ± 5 ml |
Torque settings
| Cylinder head bolts — Stage 1 | 39 Nm |
| Cylinder head bolts — Stage 2 | 90 ° |
| Cylinder head bolts — Stage 3 | 90 ° |
| Cylinder head bolts — Stage 4 | 60 ° |
| Spark plugs | 25 Nm |
| Main bearing cap — Stage 1 | 25 Nm |
| Main bearing cap — Stage 2 | 57 ° |
| Big-end bearing cap — Stage 1 | 20 Nm |
| Big-end bearing cap — Stage 2 | 90 ° |
| Wheel nuts | 108 Nm |
| Front hub | 181 Nm |
| Rear hub | 181 Nm |
Emissions
| Emission code | 715/2007*692/2008A |
| Emission standard | Euro 5 |
| CO2 average | 152 - 155 g/km |
| CO | 0.260 - 0.275 g/km |
| HC | 0.250 - 0.270 g/km |
| NOx | 0.110 - 0.130 g/km |
| CO2 average | 155 g/km |
| CO | 0.260 g/km |
| HC | 0.027 g/km |
| NOx | 0.013 g/km |
| HC | 0.270 g/km |
| NOx | 0.130 g/km |
| CO2 average | 169 g/km |
| CO | 0.294 g/km |
| HC | 0.420 g/km |
| NOx | 0.210 g/km |
Workshop procedures for this engine
Step-by-step procedures from the workshop database.
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Get free diagnosis →Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.