High Quality Content by WIKIPEDIA articles! The Mitsubishi 3B2 engine is a family of all-alloy three cylinder engines developed by Mitsubishi Motors, first produced in December 2005 at the company's Mizushima powertrain facility in Kurashiki, Okayama, for introduction in their 2006 Mitsubishi i kei car. All engines developed within this family have aluminum cylinder block and head, double overhead camshafts, four valves per cylinder, and MIVEC continuous variable valve timing. The preliminary version of the 659 cc engine was first seen in the "i" Concept test car introduced in 2003, and used Mitsubishi's Smart Idling system which turns off the engine automatically when the vehicle is stationary, and can restart it within 0.2 seconds. So equipped, Mitsubishi claimed the prototype was capable of fulfilling the "three litre initiative" for gasoline engines, meaning fuel consumption of no more than 3.0 litres per 100 kilometres (94.2 mpg, 78.4 U.S. mpg). The larger 999 cc capacity ofthe development engine was outside the limits of the kei class in Japan, but it is to be re-introduced for the second generation of the Smart Fortwo.