Hendrik - The fundamental "tone" (frequency) of an engine's exhaust is exactly as you describe. And the frequency for different engines with the same number of cylinders running at the same RPM will be identical as you mention.
HOWEVER engine displacement, exhaust port design, exhaust manifold geometry, exhaust pipe diameter/length and other factors generate all sorts of harmonics of the fundamental frequency. This causes engines with the same number of cylinders and running at the same RPM to have entirely different "voices".
Example: A straight 6 with with a center outlet manifold (Dodge/Plymouth flathead 6) sounds very different from a Continental straight 6 with its manifold outlet between the #1 and #2 cylinders.
End outlet manifolds, split manifolds, etc similarly result in dramatically different exhaust notes from otherwise identical engines.
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Incidentally as a kid I could distinguish just by sound IHC, Mack, White, Chevy/GMC, Dodge and Reo gas truck engines. Likewise Farmall, Allis-Chalmers, Minnie-Mo, Ford, etc. 4 cylinder tractors. Hearing these engines run at antique truck and tractor shows brings back fond childhood memories(!)
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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