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Buell Forum » XBoard » Archive through October 20, 2011 » Drummer SS. XB12XT « Previous Next »

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Blackdog
Posted on Saturday, October 08, 2011 - 05:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know that an open muffler will cause a loss of power at low RPM. How does Drummer over come this problem on it's SS muffler since it does not have a valve?
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Terrys1980
Posted on Saturday, October 08, 2011 - 06:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm not too sure if the power loss from not having a valve is enough to even notice. Even then a properly tuned map will get it back and then some. Drummer usually supplies you with a map.

http://badweatherbikers.com/buell/messages/32777/6 53827.html?1317898187
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Spatten1
Posted on Saturday, October 08, 2011 - 09:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The drummer is not an open muffler. It kicks back sound waves at specific distances from the head, as the valve would, just a different place in the exhaust system.
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Blackdog
Posted on Saturday, October 08, 2011 - 10:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

In the early stages of my modified mufflers I noticed a significant loss of low end torque in fully open exhaust. I had to experiment with baffles to get it just right. I never had any of them dynoed so I don't have any hard numbers. I've been on the fence about buying a SS mostly because it's stainless and the cool factor but I wanted to know if there's a loss of low end torque first.
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72rs
Posted on Sunday, October 09, 2011 - 05:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Never noticed any loss with mine.
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Bike_pilot
Posted on Sunday, October 09, 2011 - 05:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The Termi can retains the valve, maybe it'd suit you well. If its anything like the termi on my ducati it should be exquisitely crafted.
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Blake
Posted on Monday, October 10, 2011 - 07:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

American Sport Bike has a comprehensive muffler dyne shootout on their web site where you can compare the Drummer SS to stock. Check it out.
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Kds1
Posted on Monday, October 10, 2011 - 08:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

the valve is very significant in bottom end increase in the stock design...without the stock design, you don;t need a valve so to speak if you create the same end result that the valve in its location causes, well, you just don't need it...the 9 and 12 and all other stock mufflers are of the same design internally, I've seen lots of them, they are a series of tubes reverse flow and kills alot of noise, not all have valves, but the engineers at Buell thought of a way to increase expansion of the gas at early throttle opening, therefore increasing torque...you take the valve out you have a stock xb9 pipe, its not a big deal to have a valve unless you keep the stock muffler design, and it works well for stock...

Kevin
www.kdfab.com
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