I know of a couple of circumstances where a straight pipe was put in place of a broken-off muffler simply to get back to work right away. Most times though, its just showboating. A few of my occasional-use tractors around here have straight pipes because I like to hear them bark, but I also wear hearing protection when running them too. For anything that I run often, muffler stays on, not only to keep the noise down, but to maintain full power. Yes, despite what some people think, most stock engines are designed to run with a certain amount of exhaust backpressure. I'm not an engineer, don't ask me to explain it. I will say that it was very noticeable when I switched from straight pipe to muffler on my Oliver 990 with 3-71 Detroit. With straight pipe, it would pull down just a little, then completely fall off. With muffler, it will actually pull down on the revs and keep chugging through, and will only fall off after losing maybe a third of its revs. Pullers running stock Detroits are only shooting themselves in the foot by running a straight pipe.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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