Given enough time in engine research and development, only someone who is very blinkered could say they've never come across something a bit, shall we say, unusual. Devices to increase fuel economy substantially tend to be the norm here. Now and again I get a full-size drawing of an engine concept, and invariably the sender is looking for introductions or funding. This month, however, I have a camshaft, and for once its owner/designer has sent me the actual component, which looks...