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Technology Stocks : Advanced Engine Technologies (AENG)

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Nov 14 9:30 AM EST

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To: Greg Cummings who wrote (227)	5/20/1998 6:11:00 PM
From: shashyazhi	Read Replies (2) of 3383

Ron Holland, the inventor of Dolphin pulse charging for BAT International told me that Yanmar, the manufacturer of the 1500 cc diesel engine used in their Supercar had claimed that the 25 -horsepower diesel used 0.34 pounds of fuel per horsepower per hour. His actual tests indicated that the engine burned 0.36 pounds of fuel. To improve that by 30% he has to reach 0.25 pounds per horsepower per hour. He believes he can do it. Shelby believes that the OX-2 can use as little as 0.21 pounds. So we do have a range of brake specific fuel consumptions that an engine could run in. BSFC allows engines of varying displacements and designs to be compared on a more equal basis. One of the biggest fuel wastes in the internal combustion engine is the fact that fuel must be wasted to keep the engine cool. Therefore, a sub-stochiometric fuel/air ratio is used. Another power waster is pumping losses. An engine may waste as much as one-third of its power just pumping air in and out of the engine. Of course there are friction losses, too. It might take three to five horsepower just to drive the camshaft and its associated valve train. Instead of having valves, the OX-2 apparently has ports which align with the cylinders every ninety degrees of rotation. I can see what looks like throttle bodies at the top and bottom, and two exhaust pipes at the two sides of the engine. Perhaps the engine uses fuel injection. There may be some kind of seal which separates the intake and exhaust to avoid short-circuiting of the incoming fuel air mixture. On the other hand, the OX-2 information talks about mixing intake and exhaust. This may assist in the atomization of the fuel. The smaller the fuel particles, the more complete the combustion can be, and it can take place at a lower average temperature. Mazda ran into the gyroscopic torque forces described by Sword. They had a four-rotor engine in a sports-racing car. It cornered to the right and to the left differently, depending upon whether the throttle was open or closed. They were using heavy, cast-iron rotors. They switched to aluminum rotors to eliminate this problem. The cylinder block in the OX-2 could be made of aluminum with chrome-plated cylinder bores. This technology has been used in motorcycles for over thirty years.

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