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Lotus develops camless, sparkless engine
An engine which runs on petrol yet uses no sparks is the future, according to Lotus. The Norfolk company's prestigious research and development consultancy has discovered that if petrol vapour is mixed with enough recirculated exhaust gas, it becomes combustible under pressure like diesel fuel.
Making sure that this can happen under all conditions is beyond the operating range of conventional camshafts, even using variable valve timing, but individually-controlled, hydraulically-actuated valves make many more things possible. This technology makes it easier to mix in the right amount of exhaust gas by altering the valve timing over a wide range, and to accelerate or decelerate by changing the valve lift along the lines of BMW's throttle-less Valvetronic system.
The result is an engine more economical under more conditions than even the latest direct-injection petrol engines, and which runs very cleanly. So far the engine exists only on the test-bed and not in a car. Lotus is looking for a major manufacturer to help fund the next stage of development.
http://www.channel4.com/4car/news/ne...71&ref=archive
Researchers at MIT have been testing a prototype of a new internal combustion engine design that’s said to improve fuel-efficiency by up to 25% and runs on regular petrol. Labeled homogeneous charge compression ignition (HCCI), the new technology works by achieving combustion with only compression of the air-fuel mix rather than using a spark plug.
Last month Mercedes-Benz unveiled its DiesOtto concept engine, a new design that works in the same way as the HCCI system and was tested to achieve 39mpg in an S-class saloon. Volkswagen, too, is developing its own version of the system but unlike the MIT prototype and Mercedes’ DiesOtto, which run on regular petrol, the VW design requires a special synthetic fuel.
A professor at MIT, John Heywood, says that efficiency of engines could be improved even further by combining other fuel saving technologies such as forced-induction and direct injection concepts. You can read more about HCCI by
http://www.motorauthority.com/sparkl...ving-fuel.html