Lotus Developing 'Omnivore' Engine To Run on Gasoline and a Variety of Alcohols
By John O'Dell February 27, 2009
Illustration of Lotus Engineering's omnivore engine doesn't disclose much about its inner workings.
It's not a particularly lovely beast, but Lotus Engineering says its prototype "omnivore" engine will thrive on all kinds of fuels and that's likely to make it a winner in the world to come -- when petroleum is fading away and biofuels from a variety of sources and in a variety of chemistries are developing to fill the void.
Lotus says the blocky internal combustion engine has the "potential to significantly increase fuel-efficiency" for sustainable alcohol-based fuels (ethanol, methanol. propanol and butanol ) and can also run on gasoline.
The prototype one-cylinder engine will be displayed at the Lotus Cars stand at the Geneva Motor Show next week (media days begin Tuesday and the show opens to the public Thursday for an 11-day run).
Lotus Engineering -- the research and consulting arm of Lotus Cars -- says the engine is a two-stroke, single-cylinder monoblock (the cylinder head and block are one piece) that uses a unique variable compression system and direct fuel injection.
The design can utilize high octane, alcohol-based biofuels better than the four-stroke (intake-combustion-power-exhaust) engines now used in cars and trucks, the company said.
We'll let our engineering gurus explain the precise working of the system in a later posting, but the short version is that Lotus claims the engine design and mechanics permit asymmetric exhaust timing, a continuously variable exhaust opening point and a compression ratio that changes to meet load demands.
Lotus has been deeply involved in alternative energy and powerplant technology for years.
It is collaborating on development of the Omnivore engine with Queen's University of Belfast, in Northern Ireland, and Orbital Corp. Ltd. of Australia, and said the program is being sponsored by Britain's Renewables Materials Link program, which helps fund collaborative industry and scientific segment research into uses of renewable materials for sustainable development.
The Omnivore program is one piece of Lotus' research into the processes involved in operating an engine on mixtures of alcohol-based biofuels and gasoline.
A previously displayed effort was the Lotus Exige 270E Tri-fuel concept (gasoline, ethanol, methanol or any combination of the three) shown a last year's Geneva Motor Show.
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