Am I going crazy or have the BBC animation team invented a new kind of car engine 33:40 onwards ?
http://www.bbc.co.uk/iplayer/episode/b017t722/How_to_Build..._Series_2_A_Super_Car/
http://www.bbc.co.uk/iplayer/episode/b017t722/How_to_Build..._Series_2_A_Super_Car/