N55 Engine Cars
Introduction
The N55 engine is a 3.0-liter twin-turbocharged inline-6 engine produced by BMW. It was introduced in 2009 and has been used in a wide variety of BMW models, including the 1 Series, 3 Series, 4 Series, 5 Series, 6 Series, and X3.
The N55 engine is known for its smooth power delivery, impressive fuel economy, and relatively low emissions. It is also relatively easy to tune, making it a popular choice for performance enthusiasts.
Engine Specifications
The N55 engine has the following specifications:
* Displacement: 2,979 cc (181.7 cu in)
* Bore: 84.0 mm (3.31 in)
* Stroke: 89.6 mm (3.53 in)
* Compression ratio: 10.2:1
* Maximum power output: 306 hp (228 kW) at 5,800 rpm
* Maximum torque output: 300 lb-ft (407 Nm) at 1,200-5,000 rpm
Models
The N55 engine has been used in the following BMW models:
* 1 Series: 135i, 135is
* 3 Series: 335i, 335is
* 4 Series: 435i, 435is
* 5 Series: 535i, 535d
* 6 Series: 640i, 640d
* X3: X3 35i
Performance
The N55 engine provides strong performance in all of the BMW models in which it is used. The 135i, for example, can accelerate from 0 to 60 mph in 4.9 seconds, while the 335i can do it in 5.3 seconds. The 535i can accelerate from 0 to 60 mph in 5.6 seconds, and the X3 35i can do it in 5.7 seconds.
The N55 engine is also very fuel-efficient. The 135i gets an EPA-estimated 22 mpg in the city and 32 mpg on the highway, while the 335i gets 23 mpg in the city and 32 mpg on the highway. The 535i gets 20 mpg in the city and 29 mpg on the highway, and the X3 35i gets 19 mpg in the city and 28 mpg on the highway.
Reliability
The N55 engine is generally considered to be a reliable engine. However, there have been some reported issues with the engine, including:
* Timing chain problems
* High-pressure fuel pump problems
* Valve cover gasket leaks
* Oil leaks
These issues are not common, but they can be expensive to fix. If you are considering buying a car with an N55 engine, be sure to have it inspected by a qualified mechanic.
Tuning
The N55 engine is relatively easy to tune, making it a popular choice for performance enthusiasts. There are a number of aftermarket tuning parts available for the N55 engine, including:
* Intake systems
* Exhaust systems
* Intercoolers
* Charge pipes
* Engine management systems
Tuning the N55 engine can significantly improve its performance. However, it is important to note that tuning can also void the engine’s warranty. If you are considering tuning your N55 engine, be sure to do your research and only use reputable parts and tuners.
Conclusion
The N55 engine is a powerful, fuel-efficient, and relatively reliable engine. It is a popular choice for performance enthusiasts and is used in a wide variety of BMW models. If you are considering buying a BMW with an N55 engine, be sure to have it inspected by a qualified mechanic and do your research on tuning if you are interested in modifying the engine.
