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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Today's Featured Article - Bad Vibes - by Curtis Von Fange. One of the strangest ways to communicate with our tractor is to ask it how it feels. "Ask it how it feels," you say? Yup, ask it how it feels. Now, as with the other articles in this series one has to be able to hear what 'ole blue' is trying to say in response. The nice thing about our old iron friends is that they are usually quite consistent in their response, rather unlike some people I know who might change what they say due to the weather or other mitigating circumstances. But since t
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