Posted by Hendrik on October 24, 2011 at 14:26:39 from (194.53.253.51):
Been wondering about this for a long time. All of the following engines should produce the same "pitch" (assuming all are four stroke engines): a single cylinder engine at 8000 revs per minute, a two cylinder engine at 4000 revs/min, a three cylinder engine at 2667 revs.min, a four cylinder enine at 2000 revs/min, a five cylinder engine at 1600 revs/min, a six cylinder engine at 1333 revs/min, and an eight cylinder engine at 1000 revs/min. However, this is clearly not the case: each of these engines has a distinctive sound to it. Could anyone explain this, please? Does the topology and geometry of the exhaust manifold play a role? (I know that a two cylinder engine may be an odd one, depending of the relative orientation of the throws of the crank.) Thanks, Hendrik
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