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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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