BMW N45

The BMW N45 is a compact four-cylinder naturally aspirated engine of BMW. The N45 engine is a revised N40 engine. It was offered to its use in the 116i has the BMW E46. The models 316Ci 316ti and have been used in countries with a strong Displacement taxation, where the BMW suspected that the N42 1.8L engine would not sell.

The N45 engine has like the N42 engine, the engine control ME9, 16 valves and has double VANOS. From the N42 engine, it differs mainly by the lack of Valvetronic.

The revised version had N45N, inter alia, a new motor control ( such as ME1745 ).

A special case is the N45B20S with 2 liters capacity one. He was installed in the BMW 320si E90 as. This special model was offered in 2006 as a homologation model for the WTCC in a limited edition (2600 pieces). The motor has some special features. So there are the liners made of aluminum alloy and are assembled into the cylinder bore. With regular N45/N46-Motoren these consist of cast iron and are cast into the block. Also featured are reinforced connecting rods and crank in bedplate design ( aluminum housing with cast-iron deposits). The compression was increased from 10.5:1 to 11:1. The castings for the cylinder head for it arise in the Formula 1 foundry at the BMW plant in Landshut. Because of the high thermal stresses in racing the coolant passages of the cylinder head were designed especially large and the water cooler of the six-cylinder models used. In addition, specially coated rocker arms and single ignition controlled spark plugs are to be mentioned. The engine was produced largely by hand at the engine plant at Hams Hall.

Data

Use

N45B16

N45NB16

N45B20S

• 2.0 liter (1997 cc ).
• 126 kW ( 173 hp ), 200 Nm 2006 E90 320si ( limited circulation )