Forced induction

Environmental pressures prompt renewed interest in turbochargers and superchargers.

Automakers worldwide have been researching a variety of technologies aimed at maximizing power output from conventional internal-combustion engines while minimizing fuel consumption and emissions. Electric-assist motors let hybrid electric cars employ smaller IC engines that are suitable for normal cruising while providing acceptable acceleration. Traditional large-displacement gasoline engines are being fitted with cylinder-deactivation technology that lets the engine effectively reduce its displacement when cruising on level ground while retaining full power when needed. Both of these emerging technologies are very promising for specific applications, but the hybrid solution is very expensive and both are relatively unproven.

There is an alternative: forced induction, a proven technology available for modest cost that lets small, efficient engines work like bigger ones when needed.