BMW N74
| BMW N74 engine | |
|---|---|
.jpg) BMW N74 in Rolls-Royce Ghost | |
| Overview | |
| Manufacturer | BMW |
| Production | 2008–present |
| Combustion chamber | |
| Configuration | DOHC 60° V12 |
| Chronology | |
| Predecessor | BMW N73 |
The BMW N74 is a twin-turbo V12 DOHC petrol engine which replaced the N73 and has been produced from 2008 to present (as of August 2017). It is BMW's first turbocharged V12 engine.
Design
Compared with its naturally aspirated N73 predecessor, the N74 features twin-turbochargers. The turbochargers are located inside the "v" of the engine (a "hot-vee" layout) and use a boost pressure of 11.6 psi (0.8 bar).[1]
As per its predecessor, the N74 has direct injection, DOHC and variable valve timing (called double-VANOS by BMW).[2][3] However, the N74 does not have variable valve lift (called Valvetronic by BMW).[4]
The N74 marked BMW's first use of an 8-speed automatic transmission, in the form of the ZF 8HP90.[1]
Models
| Engine | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| N74B60 | 5,972 cc (364 cu in) | 400 kW (536 bhp) @5250 rpm | 750 N·m (553 lb·ft) @1500–5000 rpm | 2009– |
| N74B66 | 6,592 cc (402 cu in) | 419 kW (562 bhp) @5250 rpm | 780 N·m (575 lb·ft) @1500–5000 rpm | 2009– |
| 465 kW (624 bhp) @5600 rpm | 800 N·m (590 lb·ft) @1500–5500 rpm | 2013– | ||
| 419 kW (562 bhp) @5250 rpm | 820 N·m (605 lb·ft) @1500 rpm | 2016– | ||
| N74B66TU | 449 kW (602 bhp) @5500 rpm | 800 N·m (590 lb·ft) @1500 rpm | 2016– |
N74B60
This initial version of the N74 has a bore of 89 mm (3.5 in) and a stroke of 80 mm (3.1 in). The redline is 7000 rpm and the compression ratio is 10:1.[5]
Applications:
- 2008–2015 F01/F02/F03 760i/760Li[6]
N74B66
The N74B66 is an enlarged version of the N74B60, due to a stroke of 88.3 mm (3.5 in). The redline is 7000 rpm and the compression ratio is 10:1. It produces in excess of 563 bhp (420 kW) and is used in the Rolls-Royce Ghost.[1]
Applications:
- 2010–present Rolls-Royce Ghost 563-hp / 575-lb ft
- 2014–present Rolls-Royce Ghost V-Specification 593-hp / 575-lb ft
- 2014–present Rolls-Royce Wraith, 624-hp / 590-lb ft
- 2015–present Rolls-Royce Dawn 563-hp / 605-lb ft
N74B66TU
References
- 1 2 3 "2010 BMW 760Li – Second Drive – Car Reviews". www.caranddriver. Retrieved 12 March 2017.
- ↑ "Information on N74 engines". www.bmwheaven.com. Retrieved 11 August 2017.
- ↑ 25 years of BMW 12-cylinder engines: setting new standards in the luxury class. Munich, Germany: BMW Corporate Communications. October 2012. Retrieved 11 August 2017.
- ↑ "BMW N74 engine". www.australiancar.reviews. Retrieved 12 March 2017.
- ↑ "BMW N73 and N74 V12 Engines". www.unixnerd.demon.co.uk. Retrieved 11 August 2017.
- ↑ "BMWBLOG Road Review: 2013 BMW 760Li – The Power of 12". www.bmwblog.com. Retrieved 11 August 2017.
- ↑ "The new BMW M760Li xDrive". www.bmwgroup.com. Retrieved 11 August 2017.
- ↑ "Watch BMW's twin turbo all wheel drive V12 G11 M760li hustle to 162 miles per hour". www.bimmerboost.com. Retrieved 11 August 2017.
- ↑ "BMW N74B66TU / M760li xDrive". www.drive2.ru (in Russian). Retrieved 11 August 2017.
| « previous — BMW automotive petrol engines: 2000s to 2010s | |||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2000s | 2010s | ||||||||||||||||||||||||||||||||||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | ||||||||||||||||||||||||
| straight-3 turbo |
B38>> | ||||||||||||||||||||||||||||||||||||||||
| straight-4 | <<M43 | N40 / N42 | N45 / N46 | N43 | |||||||||||||||||||||||||||||||||||||
| <<M44 | |||||||||||||||||||||||||||||||||||||||||
| straight-4 turbo |
N13 | ||||||||||||||||||||||||||||||||||||||||
| N20 / N26 | B48>> | ||||||||||||||||||||||||||||||||||||||||
| straight-6 | M54 / M56 | N52 | N53 | ||||||||||||||||||||||||||||||||||||||
| S54 | |||||||||||||||||||||||||||||||||||||||||
| straight-6 turbo |
N54 | N55 | B58 >> | ||||||||||||||||||||||||||||||||||||||
| S55>> | |||||||||||||||||||||||||||||||||||||||||
| V8 | M62 | N62 | |||||||||||||||||||||||||||||||||||||||
| S62 | S65 | ||||||||||||||||||||||||||||||||||||||||
| V8 turbo | N63>> | ||||||||||||||||||||||||||||||||||||||||
| S63>> | |||||||||||||||||||||||||||||||||||||||||
| V10 | S85 | ||||||||||||||||||||||||||||||||||||||||
| V12 | <<M73 | N73 | |||||||||||||||||||||||||||||||||||||||
| V12 turbo | N74>> | ||||||||||||||||||||||||||||||||||||||||