The N18B16A engine is a 1.6-liter turbocharged motor manufactured in England from 2010 to 2017. This powertrain was fitted to the entire second-generation Mini range, including the Clubman R55, Hatch R56, Cabrio R57, Coupe R58, Roadster R59, Countryman R60, and Paceman R61 models. The engine was also used in Peugeot and Citroen models under the EP6CDTS index. The N18B16A was a refined version of the previous N14 engine, with a number of improvements to improve reliability and performance.
N18B16A engine specifications
| Parameter | Modification Cooper S |
|---|---|
| Determined displacement | 1598 cm³ |
| Power system | Direct injection |
| Power | 184 – 190 hp |
| Torque | 240 – 260 Nm |
| Cylinder block | Aluminum R4 |
| Cylinder head | Aluminum 16v |
| Cylinder diameter | 77 mm |
| Piston stroke | 85.8 mm |
| Compression ratio | 10.5 |
| Engine Features | DOHC, Valvetronic |
| Hydrocompensators | Yes |
| Transmission timing | Chain |
| Fasoregulator | Inlet and exhaust |
| Turbocharger | BorgWarner K03 |
| Oil | 4.2 liters 5W-30 |
| Environmental class | Euro 5 |
| Example service life | 220,000 km |
Facts about Mini N18B16A:
- Development and collaboration: The engine was created as part of a collaboration between BMW and PSA Peugeot Citroën for use in compact cars.
- Technology: The use of Valvetronic (valve control) and VANOS (variable valve timing), which improves engine efficiency and responsiveness at low and medium speeds.
- Direct heritage from the Prince series: The N18 is a modernization of the previous generation of Prince engines used in previous Mini models.
- Use in Mini: Fitted to sporty versions of the Mini Cooper S and Mini John Cooper Works (JCW) until 2014.
Use of the N18B16A engine on Mini models:
- Mini Clubman R55 (2010-2014)
- Mini Hatch R56 (2010-2014)
- Mini Cabrio R57 (2010-2016)
- Mini Coupe R58 (2011-2015)
- Mini Roadster R59 (2012-2015)
- Mini Countryman R60 (2010-2017)
- Mini Paceman R61 (2013-2016)
N18B16A engine disadvantages and problems
Despite improvements over its N14 predecessor, the N18B16A engine retains some vulnerabilities that can cause operational problems.
- Direct Injection System: Fuel quality sensitive piezo injectors can cause problems and require regular maintenance.
- Vanos and Valvetronic: Often fail, resulting in poor engine performance. Valvetronic problems are usually due to broken wires.
- Oil consumption and intake coking: Like its predecessors, the engine is prone to increased oil consumption and soot buildup on the intake valves.
- Timing chain: Modest life of timing chain and tensioner. It is recommended to regularly check the condition of the chain, especially after 100,000 km of mileage.
- Thermostat and water pump: Prone to frequent breakdowns, especially at high mileage.
Main Problems and Solutions
- Timing chain: Regular replacement of the chain and tensioner before 100,000 km will help avoid serious engine damage. Signs of chain stretching include noises at idle and unstable revs.
- Oil consumption: The engine is prone to high oil consumption, which requires constant oil level monitoring. It is recommended to change oil every 5-7 thousand kilometers to reduce the accumulation of deposits and fouling.
- Valvetronic problems: In case of Valvetronic system malfunction, broken wires are often to blame, especially the red one, which is connected to the relay. The solution is to check the wiring regularly.
- Cooling System Problems: Oil and coolant leaks through the thermostat and water pump are common problems with this engine. Replacing the thermostat and pump at the first sign of leaks will help prevent the engine from overheating.
- Valve fouling: Regular cleaning of the intake valves will help avoid fouling problems that affect engine performance and fuel consumption.
How reliable is the engine
The N18B16A engine is an improved version of Mini’s turbocharged engines, offering high performance and improved reliability over the previous N14 model. Nevertheless, this engine requires careful maintenance, especially with regard to the timing system and fuel injection system, to avoid serious breakdowns.
Engine Rating 3