2017-09-12 IAA 2017 BMW by Olaf Kosinsky-61

The BMW N74 is a

twin-turbo Twin-turbo (not to be confused with a twincharger setup, which is a combination of a supercharger and a turbocharger) refers to an engine in which two turbochargers work in tandem to compress the intake fuel/air mixture (or intake air, in the case ...

V12 V12 or V-12 may refer to: Aircraft * Mil V-12, a Soviet heavy lift helicopter * Pilatus OV-12, a planned American military utility aircraft * Rockwell XFV-12, an American experimental aircraft project * Škoda-Kauba V12, a Czechoslovak experim ...

petrol engine A petrol engine (gasoline engine in American English) is an internal combustion engine designed to run on petrol (gasoline). Petrol engines can often be adapted to also run on fuels such as liquefied petroleum gas and ethanol blends (such as ''E ...

which replaced the N73 and has been produced since 2008. It is BMW's first turbocharged V12 engine and is also used in several Rolls-Royce models.

Design

Compared with its

naturally aspirated Naturally may refer to: ;Albums * ''Naturally!'', an album by Nat Adderley * ''Naturally'' (Houston Person album) * ''Naturally'' (J. J. Cale album) * ''Naturally'' (John Pizzarelli album) * ''Naturally'' (Sharon Jones album) * ''Naturally'' ...

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 ratio of 10:1 and a specific fuel consumption of 245 g·kW⁻¹·h⁻¹ As per its predecessor, the N74 has direct injection,

DOHC An overhead camshaft (OHC) engine is a piston engine where the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion c ...

and

variable valve timing In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with varia ...

(called double-VANOS by BMW). However, the N74 does not have

variable valve lift Variable valve lift (VVL) is an automotive piston engine technology which varies the height a valve opens in order to improve performance, fuel economy or emissions. There are two main types of VVL: discrete, which employs fixed valve lift amounts, ...

(called

Valvetronic The Valvetronic system is a BMW variable valve lift system which, in combination with VANOS, allows infinite adjustment of the intake valve timing and duration. The system claims to improve fuel economy and emissions, and negates the need for ...

by BMW). 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 The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the stati ...

is 10.0:1. Applications: * 2008–2015 F01/F02/F03 760i/760Li

N74B66

Rolls Royce 200EX 'Ghost' - Flickr - The Car Spy (1)

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 The Rolls-Royce Ghost is a full-sized luxury car manufactured by Rolls-Royce Motor Cars. The "Ghost" nameplate, named in honour of the Silver Ghost, a car first produced in 1906, was announced in April 2009 at the Auto Shanghai show. The produ ...

N74B66TU

Applications: * 2016- G12 M760Li xDrive

N74B68

The 6.75 litre version was introduced in the 2018 Rolls-Royce Phantom. It is also used in the Rolls-Royce Cullinan and Rolls-Royce Ghost, both of which are built on the same platform as the new Phantom. Applications: *2017-present

Rolls-Royce Phantom VIII The Rolls-Royce Phantom is a full-sized luxury saloon manufactured by Rolls-Royce Motor Cars. It is the eighth and current generation of the Rolls-Royce Phantom, debuting in 2017, and the second launched by Rolls-Royce under BMW ownership. It ...

*2018-present

Rolls-Royce Cullinan The Rolls-Royce Cullinan is a full-sized luxury sport utility vehicle (SUV) manufactured by Rolls-Royce Motor Cars as the brand's first all-wheel drive vehicle. It is named after the Cullinan Diamond, the largest gem-quality rough diamond ever disc ...

*2021-present

References

{{DEFAULTSORT:Bmw N74 N74 V12 engines Gasoline engines by model