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A Tale of Two Powerbands

机译：两个强力乐队的故事

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Big dyno numbers are impressive, sure, but they don't necessarily make a better motorcycle. Two riders are friendly track-day rivals, riding sportbikes that are identical save for tuning differences. Their favorite track has nine turns and one-and-a-half straightaways. Rider A, feeling that it takes power to pass, has advanced the intake cam and retarded the exhaust, thereby increasing valve overlap. A's large valve overlap lets through strong exhaust-pipe wave action from exhaust to intake that helps clear exhaust from the cylinders and begins intake flow earlier than otherwise. This generates an extra 3-4 hp at peak. Rider B, concentrating on early, strong acceleration off corners, has gone the other way with cam timing, resulting in moderate valve overlap that weakens exhaust-wave action. B's peak horsepower is down slightly, maybe 5 hp softer than Rider A's.
机译：大功率的数字确实令人印象深刻，但不一定能制造出更好的摩托车。两名骑手是赛道日的友好对手，他们骑着相同的运动型自行车，只是调整差异而已。他们最喜欢的曲目有9个转弯和1个半的直线距离。驾驶员A感觉需要动力才能通过，使进气凸轮提前，并延迟了排气，从而增加了气门重叠。 A的气门重叠大，可以使排气从排气到进气产生强烈的排气管波动，从而有助于清除气缸中的排气并比其他情况更早地开始进气。这在峰值时会产生额外的3-4 hp。驾驶员B专注于早期的强劲转弯加速，与凸轮正时相反，导致适度的气门重叠，从而削弱了排气波的作用。 B的峰值功率略有下降，可能比Rider A的低5 hp。

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