The following factors are direct variables to the distinct sounds coming from each: 1) The bore size of the engine 2) The resonance of the block/heads (willingness to vibrate at certain frequencies 3) Fhe combustion chamber shape 4)The cam timing for exhaust open 5) The cam timing for exhaust close 6) The openin/closing profile of the cam or valve train 7) Multiple exhaust valves including the exhaust valve shape 8) Exhaust port computational fluid dynamics (shape) 9) Ignition timing 10) manifold runner geometry/pulse timing 11) Exhaust pipe dynamics 12) Internal surface texture of the entire system 13) The direction the pipe faces
A dog can hear the distinct NOTE of a particular engine from a mile or more away. My wife had 5 minutes warning when I came home due to the distinct sound made by my Jeep. (or several other vehicles we owned). This is not the entire story, but covers several points. I hope this helpes! Jim
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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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