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发表于 2008-9-26 13:36
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7. The inlet valves close. The piston moves upward, and the mixture of exhaust gases, air and petrol is compressed. About half-way up the compression stroke (about 45 degrees of crankshaft rotation), and before the spark has ignited the air/petrol mixture, the spark plug injector delivers a blast of air into the cylinder. The air blast creates the turbulence needed to facilitate combustion and shorten the combustion time.
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