The BMW N45 is a naturally aspirated straight-4 DOHC engine which replaced the N40 and was produced from 2004-2011. It was produced alongside the N46 and only sold in several countries, where vehicle taxes favoured small displacement engines.
The N45 is based on the N46, however it does not have valvetronic variable valve lift. As per the N42 and N46, the N45 has variable valve timing (called VANOS by BMW). In 2007, the N45 was updated, which was called the N45N.
In 2007, the N45's successor - the N43 - was introduced. However, the direct-injected N43 was not sold in countries with high-sulfur fuel, so the N45 continued to be produced alongside the N43. The N45 was phased out as new generation vehicles were released with the turbocharged N13.
|N45B16||1,596 cc (97 cu in)||85 kW (114 hp)
@ 6000 rpm
|150 N⋅m (111 lb⋅ft)
@ 4300 rpm
|N45B20S||1,997 cc (122 cu in)||130 kW (174 hp)
@ 7000 rpm
|210 N⋅m (155 lb⋅ft)
@ 4250 rpm
The N45 was enlarged to 2.0 litres, to homologate the E90 320si for the World Touring Car Championship. The N45 was chosen over the N46, because its lack of variable valve timing allows higher engine speeds.
- 2006 E90 320si (Limited production model)
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