Author |
Message |
Blackdog
| Posted on Saturday, October 08, 2011 - 05:22 pm: |
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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? |
Terrys1980
| Posted on Saturday, October 08, 2011 - 06:00 pm: |
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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 |
Spatten1
| Posted on Saturday, October 08, 2011 - 09:45 pm: |
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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. |
Blackdog
| Posted on Saturday, October 08, 2011 - 10:52 pm: |
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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. |
72rs
| Posted on Sunday, October 09, 2011 - 05:07 pm: |
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Never noticed any loss with mine. |
Bike_pilot
| Posted on Sunday, October 09, 2011 - 05:24 pm: |
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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. |
Blake
| Posted on Monday, October 10, 2011 - 07:00 am: |
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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. |
Kds1
| Posted on Monday, October 10, 2011 - 08:50 pm: |
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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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