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Unread 09-16-2015, 10:39 AM   #1
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Default What determines engine noise?

So, as the title says, what determines the noise the engine makes as it revs? Besides the obvious answer of the cam(s), intake, and exhaust, what determines why a chevy v8 sounds so different than a ferrari v8?

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Unread 09-16-2015, 04:50 PM   #2
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sound is the audible form of inefficiency. A 100% efficient energy conversion would be completely silent as their would be no energy transfer to create sound. As such the inherent efficiency of a motor will alter its exhaust tone beyond just the components that make up the Air/Fuel/Spark to exhaust components.

Since there are many soundwaves interacting to create audible sound, one minor change in frequency or amplitude of one component can alter the way those sound waves interact to generate the exhaust note.

Everything has an effect.
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Unread 09-16-2015, 08:07 PM   #3
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All the various combinations of shapes and sizes of internal engine dimensions will vary the sound an engine makes. The bore, and stroke, intake runner shape and size, manifolds, exhaust manifold shape and size... all of it varies the sound.

A ferarri V8 sounds much different than a chevy because it is a fully race designed engine, its much smaller, has a much shorter stroke, all the ports are highly refined from factory, different firing order, it has a tuned exhaust manifold and tuned intake with some velocity stacks likely...etc etc.
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