I will NOT dis-agree or call into question how or what others use to note various engine physical or operational characteristics. In terms of describing engine sound quality, however, firing frequency (HZ) is at LEAST one of the terms used to characterize engine noise by engine and/or sound quality analysts. Cycles or Hertz are also basically the same term as each refers to a repetive action usually stated for a given period of time (CPM - cycles per minute, CPS - cycles per second, or CPD - cycles per day, et etc.) The term Hertz (HZ), however, is ONLY indiciative of the # of cycles per second. It is true that when looking at spacing between firing "pulses", the higher # of cylinders are hard for the human ear to perceive as a "pop". The human ear can usually notice the different sound quality for these engines running at the same rotational speeds. Sometimes it's much harder for the human ear to distinguish between engines of different cylinders but at the same firing frequency. With proper measuring equipment, however, one can ALWAYS objectively/repeatedly determine these firing or other sound quality differences.
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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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