The N42 is a series of I4

Straight-4

The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....

 automobile

Automobile

An automobile, autocar, motor car or car is a wheeled motor vehicle used for transporting passengers, which also carries its own engine or motor...

 piston engines from BMW

BMW

Bayerische Motoren Werke AG is a German automobile, motorcycle and engine manufacturing company founded in 1916. It also owns and produces the Mini marque, and is the parent company of Rolls-Royce Motor Cars. BMW produces motorcycles under BMW Motorrad and Husqvarna brands...

 designed in conjunction with MG Rover engineers with the intention of replacing the larger capacities of K series engines used in Rover products. However, this plan was dropped following the sell off in 2000. The series debuted with the E46

BMW E46

The BMW E46 is the fourth generation of the 3 Series compact executive cars produced by BMW, produced from 1998 when it succeeded the BMW E36 until it was replaced by the BMW E90 in 2005....

 cars in 2001. Displacement ranges from 1.8 L to 2.0 L.

Models

Engine	Displacement	Power	Torque	Redline	Year
N42B18	1.8 L (1796 cc/109 in³)	85 kW (115 hp) @ 5500	175 N·m (129 ft·lbf) @ 3750	6500	2001
N42B20	2.0 L (1995 cc/121 in³)	105 kW (143 hp) @ 6000	200 N·m (147 ft·lbf) @ 3750	6500	2001

N42B18

The N42B18 is a 1.8 L (1796 cc) version producing 85 kW (115 hp) and 175 N·m (129 ft·lbf). It uses Bosch

Robert Bosch GmbH

Robert Bosch GmbH is a multinational engineering and electronics company headquartered in Gerlingen, near Stuttgart, Germany. It is the world's largest supplier of automotive components...

 DME ME9.2 fuel injection

Fuel injection

Fuel injection is a system for admitting fuel into an internal combustion engine. It has become the primary fuel delivery system used in automotive petrol engines, having almost completely replaced carburetors in the late 1980s....

.
It has twin-balancing shafts. The N42B18 won the 1.4-1.8 L category of the International Engine of the Year

International Engine of the Year

The International Engine of the Year is an annual competition for automotive industry internal combustion engines, judged by a panel of automobile journalists from around the world. It is organised by the United Kingdom's largest technical motoring, aerospace and traffic management publication...

 competition for 2001.

Applications:

• 2001-2004 E46
  BMW E46
  The BMW E46 is the fourth generation of the 3 Series compact executive cars produced by BMW, produced from 1998 when it succeeded the BMW E36 until it was replaced by the BMW E90 in 2005....
  
   316i/316ti

N42B20

The N42B20 is a larger 2.0 L (1995 cc) version. It produces 105 kW (143 hp) and 200 N·m (148 ft·lbf) with the same Bosch

Robert Bosch GmbH

Robert Bosch GmbH is a multinational engineering and electronics company headquartered in Gerlingen, near Stuttgart, Germany. It is the world's largest supplier of automotive components...

 DME ME9.2 fuel injection

Fuel injection

Fuel injection is a system for admitting fuel into an internal combustion engine. It has become the primary fuel delivery system used in automotive petrol engines, having almost completely replaced carburetors in the late 1980s....

. It has twin balance shaft

Balance shaft

In piston engine engineering, a balance shaft is an eccentric weighted shaft which offsets vibrations in engine designs that are not inherently balanced...

s.

Applications:

• 2001-2004 E46
  BMW E46
  The BMW E46 is the fourth generation of the 3 Series compact executive cars produced by BMW, produced from 1998 when it succeeded the BMW E36 until it was replaced by the BMW E90 in 2005....
  
   318i/318Ci/318ti