Simple explanation, a round conduit is just cheaper to mass produce. Also, for fluid movement( air is a fluid too), the surface of a conduit creates drag, due to friction. So a round conduit has less friction since is has less surface area. Who knows about the sound. That is a function of how the inner baffles work. So, try it out and see. That's actually how engineering is done most of the time. It's called controlled experiments.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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