BMW S65

The BMW S65 was a naturally aspirated V8 petrol engine produced from 2007 to 2013, used mainly in the E90, E92 and E93 M3, where it replaced the S54 straight-six. It derives from the S85 V10 of the E60 M5 and shares its aluminium construction and its 92 millimetre bore and 75.2 millimetre stroke, with individual throttle bodies, ionic current knock sensing, double-VANOS variable valve timing, a 12.0:1 compression ratio and an 8,400 rpm redline. A wet-sump system replaced the three-pump layout of the S85, and the dry weight of 202 kilograms was 15 kilograms below the S54. The S65B44 enlarged version powered the M3 GTS. It won the International Engine of the Year award for the 3.0 to 4.0 litre class from 2008 to 2012, and no direct replacement followed because the next M3 turned to a turbocharged six.