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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.

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 100bhp/liter and features a very high compression ratio of 12.0:1, beating the previous M3 of 11.5:1

• 5.0 Liter V10 engine, 507 hp/520Nm, 383 ft·lbf torque

• Double VANOS system which varies both intake and exhaust valve timing
• 10 individual electronically controlled throttles
• Knock sensors have been eliminated to utilize the new “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 between 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:

1. International Engine of the Year, BMW 5.0 Liter V10 (M5,M6)
2. Best Performance Engine
3. Best New Engine
4. Best Above 4.0 Liter

In 2006 the S85B50 again won several International Engine of the Year awards, winning in the following 3 categories:

1. International Engine of the Year, BMW 5.0 Liter V10 (M5,M6)
2. Best Performance Engine
3. Best Above 4.0 Liter

In 2007 the S85B50 again won several International Engine of the Year awards, winning in the following 2 categories:

1. Best Performance Engine
2. Best Above 4.0 Liter

See also

• List of BMW engines
• BMW M5
• BMW M6