September 9, 2008 The imperatives of better fuel economy and reduced emissions are breeding some fascinating developments of the good ol’ Internal Combustion Engine (ICE). One of the most logical ideas could have been invented by any schoolboy – turn off the engine when it isn’t being used. VW was the first to trial the idea and BMW, MINI, smart, Citroen and Peugeot have followed suit, all using electrical power to restart the engine, requiring beefed up starting systems to cope with ever-more-congested urban conditions (25% of European driving time is now spent at standstill). Now Mazda has come up with a better idea - restarting the engine through combustion. Mazda’s system initiates engine restart by injecting fuel directly into the cylinder while the engine is stopped, and igniting it to generate downward piston force.