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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Exhaust: Headers, Muffler, Gaskets, Supports » Archive through July 28, 2007 » Too much backpressure? « Previous Next »

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Johnnylunchbox
Posted on Sunday, May 13, 2007 - 06:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I modified the Kerker exhaust on my Blast. It was way too loud. It would actually scare the hell out of the horses next door when I'd ride by.

I narrowed the outlet and drilled holes along the underside to divert some of the exhaust. It quieted the exhaust nicely. I noticed a great improvement in low RPM torque, but it is gutless at the higher end. It's way down on top end power.

I fear there is too much backpressure and at higher RPM's it is not moving enough exhaust. This can cause problems right? Not enough scavenging of the hot exhaust gasses or something? What kind of damage can this do?

I might open the outlet a little and use steel wool in the area of the holes in the can. The fiberglass packing seems to be blocking the holes anyway.

Any thoughts?
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Blake
Posted on Tuesday, May 15, 2007 - 01:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You are probably on the right track with your diagnosis. Please note that regular old steel wool will very quickly turn to rust dust.
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Johnnylunchbox
Posted on Tuesday, May 15, 2007 - 08:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Blake, I couldn't find stainless steel wool. Not sure if it even exists. Fortunately the can is easily removed. I may experiment with other packing material in the vicinity of the underside holes.
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Bombardier
Posted on Saturday, July 14, 2007 - 08:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Look to the supermarket for you stainless steel wool. The up market pot scourers are usually made of stainless.
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