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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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