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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="macvette" data-source="post: 8238" data-attributes="member: 262"><p>This is definitely off topic. In the early 70's there was a significant explosion on one of the nations then leading petrochemical company's facilities. It was thought to have been caused by a crane's diesel engine ingesting hydrocarbon gas, bouncing it's valves as a result of over revving and backfiring though the intake into the gas cloud. I was charged with coming up with a solution to this. Problem was the theory was wrong because it was impossible to over rev to valve bounce speeds without destoying the engine. The actual mechanism was that the engine govenor racked back to compensate for the gas in the atmosphere and the engine ran quite smoothly on the gas and diesel mixture. The gas retarded the normal ignition point with the result that flame fronts travelled quite quietly out of the inlet manifold and ignited the gas cloud during the valve overlap period.</p><p>I and another friend came up with a device that detected levels of gas in the atmosphere and shut down the diesel by injecting co2 before the situation developed dangerously. We are both named on the patents covering this( no cash because it was before the law was changed to compensate the inventors). </p><p>Back on topic, to stop the diesel we had to inert the engines and decided to use co2 fire extinguishers as a source of gas. Our first attempts resulted in fractured pistons as the freezing gas hit the hot pistons. The cure turned out to be simple. We turned the cylinders upside down ( they feed from the bottom) and this cured the problem. Of course , we were stopping large equipment engines so there was avery significant temperature difference between the co2 and the pistons. Nevertheless I wouldn't do a leak down with co2 on a hot engine and would make sure that on a cold engine, the co2 bottle is upside down. </p><p>Regards Mac</p></blockquote><p></p>
[QUOTE="macvette, post: 8238, member: 262"] This is definitely off topic. In the early 70's there was a significant explosion on one of the nations then leading petrochemical company's facilities. It was thought to have been caused by a crane's diesel engine ingesting hydrocarbon gas, bouncing it's valves as a result of over revving and backfiring though the intake into the gas cloud. I was charged with coming up with a solution to this. Problem was the theory was wrong because it was impossible to over rev to valve bounce speeds without destoying the engine. The actual mechanism was that the engine govenor racked back to compensate for the gas in the atmosphere and the engine ran quite smoothly on the gas and diesel mixture. The gas retarded the normal ignition point with the result that flame fronts travelled quite quietly out of the inlet manifold and ignited the gas cloud during the valve overlap period. I and another friend came up with a device that detected levels of gas in the atmosphere and shut down the diesel by injecting co2 before the situation developed dangerously. We are both named on the patents covering this( no cash because it was before the law was changed to compensate the inventors). Back on topic, to stop the diesel we had to inert the engines and decided to use co2 fire extinguishers as a source of gas. Our first attempts resulted in fractured pistons as the freezing gas hit the hot pistons. The cure turned out to be simple. We turned the cylinders upside down ( they feed from the bottom) and this cured the problem. Of course , we were stopping large equipment engines so there was avery significant temperature difference between the co2 and the pistons. Nevertheless I wouldn't do a leak down with co2 on a hot engine and would make sure that on a cold engine, the co2 bottle is upside down. Regards Mac [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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