BMW S65

The BMW S65 is a V8 DOHC piston engine which replaced the (straight-6) S54 and was produced from 2007–2013.

Derived from the BMW S85 V10 engine used in the M5/M6, it shares the same basic architecture and aluminium construction. It was introduced in the E92 M3 and was chosen as International Engine of the Year for the 3.0 to 4.0 L category in 2008, 2009, 2010, 2011, and 2012.

Models

S65B40

Applications:

S65B44

Applications:

P65B44

Applications:

Development

The S65 engine was developed due to its S54 predecessor having reached the end of its development potential and being unable to meet increasingly stringent Euro V and California Air Resources Board (CARB) emissions regulations.

Design

The S65 shares the same 92 mm (3.6 in) bore and 75.2 mm (3.0 in) stroke cylinder dimensions with the S85 V10, along with the Double-VANOS variable valve timing system and 12.0:1 compression ratio.