BMW N55
| BMW N55 engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer | BMW |
| Production | 2009–present |
| Combustion chamber | |
| Configuration | Straight-6 |
| Chronology | |
| Predecessor | BMW N54 |
| Successor | BMW B58 |
The BMW N55 is a turbocharged direct injection straight-6 DOHC engine which began production in 2009. It was launched in the F07 535i Gran Turismo. The N55 began to be phased out following the introduction of the B58 engine in 2015.
Compared with its N54 predecessor, the N55 features a single twin-scroll turbo (the N54 uses twin turbos) and variable valve lift (called Valvetronic by BMW).
The F80 M3 and F82 M4 are powered by the S55 engine, which is the high performance version of the N55.
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Biturbo engine by Alpina based on the N55B30M0. The crankcase is of a different design and specially cast by BMW for Alpina.
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While its N54 predecessor uses parallel twin-turbochargers, the N55 uses a single twin scroll turbocharger. BMW has used the term "TwinPower Turbo" to describe both twin-turbo and (single turbocharger) twin-scroll systems. Another difference is that the N55 has variable valve lift (called Valvetronic by BMW). Displacement and peak power output are the same as the N54, however fuel economy is improved 15%, emissions have been reduced, less turbo lag and better low-rev torque.
As per the N54, the bore is 84 mm (3.3 in), the stroke is 89.6 mm (3.5 in) and the capacity is 2,979 cc (181.8 cu in). The compression ratio is 10.2:1. The N54's gasoline direct injection system uses piezo injectors, also used in the naturally-aspirated N53 (mostly European markets only), the N55's direct injection uses Bosch solenoid-type injectors. The piezo injectors were more expensive and BMW decided they were not worthwhile in North America, in contrast to Europe which they could perform lean burn to reach their full potential.
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Wikipedia