How a Quiet Muffler Works
Patented “diffuser disc” design cuts noise and traps hot sparks in a system that is quieter, smaller, and lighter than any other spark arrestor or compact muffler.
The exhaust outlet is formed by stacking the individual diffuser discs to form a series of annular openings. The Precise space between the discs provides a barrier against noise and sparks without restricting the exhaust flow while the number of diffuser discs required is proportional to engines size. The exhaust noise will be minimized when the least number of discs is used with the optional resonators.
As the exhaust flows out radially between the discs, the noise is first dissipated and then diffused over a quirt 360~pattern. After leaving the discs, the exhaust path curves inward toward the centerline and is rapidly cooled by mixing with the surrounding air. Only 1/2″ clearance is required between the disc’s outer edge and any heat sensitive areas.
This muffler is the only U.S.D.A. Forest Service Approved spark arrestor without restrictive swirl baffles or fragile screens. Hot spark are propelled directly into the collection chamber(end cap) by the natural exhaust flow momentum. The .023″ spacing between the discs gives back-up protection should the chamber fill to capacity.
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About the Author
Jacks Jack's Small Engines has been providing parts for outdoor power equipment online since 1997. We also run a service center for outdoor power equipment like riding mowers, snow blowers, generators, chainsaws, and just about anything else.
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