DragBikeMike
Serious Thumper
Offline
SuzukiSavage.com Rocks!
Posts: 4284
Honolulu
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Since the inside diameter or the core is only about 1.4” (actually only about 1” in way of the louvers), inserting some sort of baffle inside the core will dramatically restrict flow. My goal is to retain good flow while reducing noise. The diameter of the muffler body is also small, and it’s tapered. There’s not a lot of room to incorporate a free-flowing baffle. The only option seems to be surrounding the core with wool packing to absorb the acoustic energy.
The mufflers are welded together, and they are manufactured from heavy-gauge steel. Any mods will require cutting the muffler open. Cutting requires touching up the exterior coating, so I chose the Black Mac as the most likely candidate for surgery. I can touch up the cuts with VHT Flame Proof Paint.
I had never run the motorcycle with the Black Mac installed, nor had I flow tested the Black Mac, so I needed to do some baseline tests. On the test bench, I immediately saw that the chrome Mac and the Black Mac are different animals. While the chrome Mac pulls 32-1/2” H2O on the bench, the Black Mac only pulls 26” H2O. I repeated the tests over & over. Same results. Why is the Black Mac less restrictive? I thought they were identical.
I set them side by side. The Black Mac is about one-inch shorter. Hmmmm? I would find out why the Black Mac flowed better when I cut it open.
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