Lotus has revealed some details about the Lotus Omnivore engine concept that it will be unveiling at the 2009 Geneva Motor Show. The Omnivore runs on a two-stroke operating cycle that Lotus says is more suited to flex-fuel operations than conventional 4-stroke engines. It also has direct fuel injection, a system called Orbital FlexDI that allows fine-tuning the injection spray to help with HCCI (sparkless ignition) control. The engine uses a monoblock design that combines the block and head, thus eliminating the cylinder head gasket. This improves durability and reduces weight. The exhaust port has a charge trapping valve that allows assymetrical exhaust flow timing and a continuously variable exhaust opening point. A puck at the top of the combustion chamber moves up and down to alter the geometric compression, thus achieving variable compression ratio.