BMW N74


The BMW N74 is a twin-turbo V12 petrol engine which replaced the N73 and has been produced since 2008. Production will end in 2023. It is BMW's first turbocharged V12 engine and is also used in several Rolls-Royce models.

Design

Compared with its naturally aspirated BMW N73 predecessor, the N74 features twin-turbochargers. The turbochargers are located on the outside of the engine and use a boost pressure of. In its base configuration, the engine has a compression of and a specific fuel consumption of 245 g·kW−1·h−1
As per its predecessor, the N74 has direct injection, DOHC and variable valve timing. However, the N74 does not have variable valve lift.
The N74 marked BMW's first use of an 8-speed automatic transmission, in the form of the ZF 8HP90.

Versions

N74B60

This initial version of the N74 has a bore of and a stroke of. The redline is 7000 rpm and the compression ratio is 10.0:1.
Applications:
The N74B66 is an enlarged version of the N74B60, due to a stroke of. The redline is 7000 rpm and the compression ratio is 10.0:1. It produces up to and is used in the Rolls-Royce Ghost.
YearApplicationPower outputTorque
2010–presentRolls-Royce Ghost
2014–presentRolls-Royce Ghost V-Specification
2014–presentRolls-Royce Wraith
2015–presentRolls-Royce Dawn

N74B66TU

Applications:
The 6.8 litre version was introduced in the 2018 Rolls-Royce Phantom. It is also used in the Rolls-Royce Cullinan SUV, built on the same platform as new Phantom.
Applications: