N45B16 & N45N

The N45B16 was the 1.6-litre unit fitted to the 116i from 2004 until early 2007 and was quite different to the N42/46. For a start, it didn’t have Valvetronic or balance shafts, and due to the regular throttle body it didn’t need the brake vacuum pump. The head was a unique design. The N45N from early 2007 was almost identical and was fitted to cars after 2007 where the direct-injection N43 would not meet US emissions regulations. N45 engines had a small primary catalytic converter fitted to the exhaust manifold.