BMW S85
| BMW S85 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | BMW Bayerische Motoren Werke |
| Production | 2005– |
| Body and chassis | |
| Class | V10 |
| Chronology | |
| Predecessor | S62 |
The BMW S85B50 is a DOHC 40-valve V10 automotive piston engine found on the E60 M5 and E63 M6. It was inspired by BMW's formula 1 racing division and shares many components and technology that powered the BMW Williams F1 cars.
The 2008 Wiesmann GT MF 5 will also have the BMW S85 V10 Engine.
Technology & Performance
The S85B50 is a high-revving engine designed to utilize power from a wide rev band. Having a redline of 8250 rpm, it achieves over Template:Auto bhp/litre and features a very high compression ratio of 12.0:1, beating the previous M3 of 11.5:1
- 5.0 Litre V10 engine, Template:Auto hp @ 7750rpm/Template:Auto Nm torque @ 6100rpm
- Double VANOS system which varies both intake and exhaust valve timing
- 10 individual electronically controlled throttles
- Knock sensors have been eliminated by utilize the "ionic current" measuring system. Using the ionic current system, engine misfires as well as knock can be measured simultaneously. Combustion quality raises or lowers cylinder pressure. The ionic current is measured by passing a low voltage across the spark plugs immediately following the ignition spark.
- Dry sump lubricating system
Awards
In 2005, the first year that it was nominated, the S85B50 won four different International Engine of the Year awards in the following 4 categories:
- International Engine of the Year, BMW 5.0 Litre V10 (M5,M6)
- Best Performance Engine
- Best New Engine
- Best Above 4.0 Litre
In 2006 the S85B50 again won several International Engine of the Year awards, winning in the following 3 categories:
- International Engine of the Year, BMW 5.0 Litre V10 (M5,M6)
- Best Performance Engine
- Best Above 4.0 Litre
In 2007 the S85B50 again won several International Engine of the Year awards, winning in the following 2 categories:
- Best Performance Engine
- Best Above 4.0 Litre