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But the piston isn't really moving much 20 degrees before or after TDC and even at just 2000 rpm what fraction of a mili-second are we talking about before the piston reaches TDC? The explosion and heat expansion if started at TDC even IF the vapor system increased the explosion (which is doubtful as the energy content doesn't change) it still needs to be started just as early or it will be wasted on a less compressed air volume.
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