Ilmor Engineering presents the five-stroke engine
By Andrew C., 29 Aug, 2010. 0 Comments
English engineering firm Ilmor‚ latest internal combustion device is a gas-powered five-stroke with diesel consumption. This creation, which burns fuel more frugally, is a stark contrast to its work producing powerplants for Formula One, IndyCar, and NASCAR. Ilmor starts with a three-cylinder, 700cc, turbocharged engine with 130 hp and 122 lb-ft. There are two overhead camshafts: a high pressure shaft turning at half the crank speed working on the two high pressure cylinders, and a low pressure shaft running at crank speed for the third cylinder. The two outside, high-pressure cylinders work like a normal four-stroke, but alternate their exhaust flow into the third, central low-pressure chamber. That cylinder's expansion and compression strokes aren't fixed, so it can be selectively tuned for the best expansion ratio. Ilmor claims that for the same amount of gas, extra work gets done. Fuel efficiency is higher compared to conventional gas engines. Since the five-stroke is made with current, in-use technology, there would be no extra costs for special materials or processes. It‚ also described to be "relatively compact." Ilmor will not stop there. Its next step is to build another working prototype with targets of 10% better fuel efficiency and 20% less engine weight compared to an equivalent four-stroke engine.
[via autoblog]
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