• Magazine Feature Article
  • 16AUTP02_02
Published February 01, 2016 by SAE International in United States
  • English

Highlighting the design, engineering, and technologies inside some of the most competitive new gasoline and light-duty diesel ICEs.

Engine history bonus question for 100 points: What technology has been shared by the P-47 Thunderbolt fighter plane, Oldsmobile's 1962 Jetfire V8, the Saab 99 Turbo, and the 2016 BMW M4 GTS?

Answer: Water injection, a proven technique for raising the knock threshold, enabling a higher compression ratio for more power output over a wide operating range. Water injection is particularly effective in highly boosted engines, hence BMW's adoption of it in a limited-production run of M TwinPower 3.0-L Turbo inline six units powering the track-day-focused M4 GTS.