Fudiesel controls sound level by choosing the internal structure of the muffler rather than by adding a restriction at the tailpipe. A straight-through muffler with a perforated core and an absorptive packing around it reduces restriction while taking the sharp edge off the note, and it is the usual starting point when the buyer wants flow and an acceptable level together. Where the target is quieter, the internal volume of the canister is increased, the packing type or density is changed, or chambered sections are added to break up the sound wave before it leaves the tailpipe. A note has a tone as well as a level, so the balance between a deep low frequency and a harsh high frequency is tuned through the same internal choices. Fudiesel sets the target sound with the buyer alongside the pipe layout, then confirms the design against the drawing or an approved physical sample and states the agreed specification in the written quotation.
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Email:fudiesel@fupower.com
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