Generators How Quiet Muffler Works

Published on February 27th, 2015 | by Jacks


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

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.

4 Responses to How a Quiet Muffler Works

  1. Daniel Brooks says:

    dose a muffler have any effect on a small engine, like a generator

  2. Jim Keene says:

    I have a 2000 w generac generator on my 2001 Pleasure Way class B camper. It is fully enclosed in a metal box under the rear storage compartment and has an exhaust which extends out the passenger side of the vehicle. Is there any kind of muffler which I could clamp on to the end of the 1.5″ exhaust to quiet it down a bit and maybe even direct the exhaust in a downward direction?

  3. jd says:

    I have a 13 HP (420 cc) Predator engine that I bought at Harbor Freight.
    I know that they are not the greatest engine on the market. I got it on sale for $240.
    I use it on a Thai Long Tail Mud-skipper that I have on a 16 foot jon boat that is 48 inches wide at the base of the transom.
    I use the boat for fishing for red fish in the shallow estuaries of the Gulf of Mexico in north central Florida.
    I am looking for a quiet muffler to install on the Predator. The way the stock exhaust is configured on the Predator, the exhaust is pointed towards the starboard (right side when looking forward) side of the boat. The exhaust port on the engine is configured on the rear of the engine. I am looking for a muffler that will come straight out of the back of the engine and will be pointed towards the back of the boat. The Predator muffler has a 90 degree bend in the exhaust manifold that causes the muffler to be pointed towards the starboard side of the boat. Does anyone have a suggestion on what muffler to buy? I would like it to be a relatively quiet muffler that goes straight towards the back of the boat when the boat is in operation. Thanks for your help. j in Gainesville Florida

    • Mark Wallner says:

      You might want to try the “Quiet Muffler” advertised on this website (Jack’s Small Engines);
      In my experience, the threads used on the exhaust systems are standard pipe threads, and you should be able to buy a pipe elbow for it at most any hardware store to redirect it if necessary. Try to get a large-radius elbow (a “90 degree sweep El”) to restrict the flow as little as possible.

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