Muffler Issues, materials and mounting

[lotusman1951]

So I am going quite-I have been a bad boy to long-

 

I am doing this to my Fisher Fury-its just like a 7 with a side pipe and turnout in front of the wheel.

 

My collector exits with 2.25 pipe-and I had a 5 inch round (glasspack) with a 22 inch long body-and a 90 degree turnout tip. This all weighs about 20 pounds and put a strain on the isolation bobbin/rubbers,

 

I replaced the 5 inch muffler with a 3.5 inch--lighter but snarley loud.

 

One last thing the Fury, unlike a Seven, encloses the side exhaust in a fiberglass pontoon it is well heat shielded inside but-a fire "risk"-so I like cooler muffler body materials and wish to keep the body away from the fiberglass so 4 inch body good-5 OK-long like 22-24 inch.

 

So at the moment I am into rebuildable with stainless steel wool. Units from Coast Fabrication-there bodies are 4,5 inches. They uses Stainless steel bodies-but I am interested in a carbon fiber body for surface temp reasons-will a carbon fiber exhaust be cooler than steel, or stainless?

 

The Coast Fab. is light but I am looking for isolation bobbins that are stronger/reinforced-any suggestions ?

 

Anyone have a surplus Caterham carbon Fiber silincer?

 

Thanks Kevin

 

PS the fury is going like stink-the supercharger is on an electric clutch and when it engages-its swell.

[wemtd]

I'm not sure how "strong" your old isolators are? I got a larger/stronger replacement from McMaster which has held up well for me. I've also heard of using a trimmed down hockey puck

[jimrankin]

The old volkswagon "hourglass" motor mounts are really strong and small. I have been using one to support the muffler/catalytic converter on my S2K for several years. Male threaded post out each end so super easy to fit. There were used as mast base "universals" on some of my early sailboard rigs and never had one fail and that's saying something for the rough SF bay high wind rides it had to handle. I'll see if I can find a picture.

[lotusman1951]

I found some Harley Davidson bobbins with a spring thats welded to the end plates and enclosed in rubber. That might do and then the next will be the VW idea.

 

Thanks Kevin

[Dave W]

I was having the same issues with my 4" Dia. x 30" lg muffler. After breaking two rubber bonded mounts I changed to a spring suspened mount with a lower rod end attachment at the muffler. The rod end allows the system to twist with the engine torque movement, plus you can reload the spring attachment to limit over all movement. This will not break! Dave W