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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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