One little detail here. Firing cycles are not in hertz. Yes they fire so many times per second, but blow down time for a cylinder has nothing to do with cycles per second. Blow down is just an ordinary exponential time constant. It takes so long to blow down and that is that.
What it means is that a cylinder pops a pulse into the pipe. Separation time between pulses is the major factor in all exhausts. It is why you cannot turn a 3 cylinder engine at a higher speed and make it sound like a 4 cylinder, or a six, or an 8. It is why they all sound different. Putting more cylinders on the same pipe eventually causes the pulses to run together, to the point that an 8 or 12 has almost no distinguishable pulses at all.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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