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Re: Let's get the facts straight about straight pi
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Posted by BillWV on May 01, 2004 at 18:01:42 from (129.71.136.134):
In Reply to: Let's get the facts straight about straight pipes! posted by Farmallkid on May 01, 2004 at 07:42:08:
I'm not sure about the bigger tractors, but if I'm not mistaken the muffler was an option on the smaller tractors, at least the early ones. In other words, you could get them from the factory with a straight pipe. I know that exhaust backpressure is a critical part of tuning on high revving engines, my own experience is with street bikes and turbocharged 4 cylinder cars, but I don't think it amounts to much on farm tractors. Maybe if you were pulling competitively and looking for an edge, even then as another post said, it is part of the tuning equation, it has to be balanced out with carb jetting and ignition timing. Pulling the muffler off of a well-tuned engine will hurt performance, no doubt; if it helps, the engine wasn't tuned optimally to start with. Good luck, Bill
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