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Technology Stocks : Orbital Engine (OE)

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To: John M Connolly who wrote (4506)	9/29/2000 9:02:46 AM
From: dwight martin	Read Replies (1) of 4908

biz.yahoo.com Mentions "variable spark gap," something brand new to these ears. EDIT: More at orbeng.com.au The spark plug gap is variable between 1 and 3.5 mm. The spark is struck from a central electrode in the spark plug injector either to a fixed earth electrode at a distance of 3.5 mm or to an earth electrode on the piston. The variable spark gap together with a high spark firing energy (80 mJ) is essential for igniting an air/fuel mixture that is so highly diluted with exhaust gases. The spark gap is variable between 1 and 3.5 mm. At low load, the spark is fired from the central electrode in the spark plug injector to a fixed earth electrode at a distance of 3.5 mm. At high load, the spark is fired somewhat later, and the gas density in the combustion chamber is then too high for the spark to bridge a gap of 3.5 mm. A pin on the piston is then used instead as the earth electrode. Following the laws of physics, the spark will be struck to the electrode on the piston as soon as the gap is less than 3.5 mm. That pin must be made of "unobtainium."

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