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1 or 2 muffs on race bikes?

Old 07-16-2016, 02:46 PM
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1 or 2 muffs on race bikes?

Did the race Superhawks and RC51s use 1 or 2 mufflers? I have been having a hard time finding pics. Even if they are about the same power ditching the weight and having better access to the chain n stuff would be worth it. right now I have RS3 slip ons. A single RS3 will have plenty of flow as long as the right size pipe is used between the collector and the muff. My plan is to cut it at the collector and fab a high pipe to a shortened RS3 after ditching the buddy pegs.
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Old 07-16-2016, 06:37 PM
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I don't recall anyone ever having good results going into one.



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Old 07-16-2016, 06:51 PM
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Actually it won't be worth it if the bike runs worse.

https://www.superhawkforum.com/forum...trovery-33136/
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Old 07-16-2016, 06:57 PM
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To answer your question, yes, I remember the factory RC51's I saw at Daytona initially running 2 into 1 Jardines (which if I remember correctly I read on RC51.org were actually made by Akrapovic with Jardine badges on them) and the Erion bike with a 2-1 Erion. They progressed to dual muffler systems later on. I'm sure if you google stuff like "Miguel Duhamel RC51" or Nicky Hayden RC51" or "Kurtis Roberts RC51" and search around you can probably find some first season pics with the single muffler. I believe Aaron Slight and Colin Edwards were the first season (2000) riders for Castrol Honda in WSBK for further search purposes. I believe they were running Akrapovics. (I'd look for you but it's past my bedtime and I'm on 24 hr shift tomorrow and up at 5).

Last edited by captainchaos; 07-16-2016 at 07:10 PM.
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Old 07-16-2016, 08:41 PM
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I believe factory hrc team used both, depended on actual engine setup.
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Old 07-16-2016, 10:16 PM
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Thanks for the response! I am surprised but it seems at this point like it would not be worth while to pursue. Exhaust design constantly evolves but this idea would need a lot more than a little love with the TIG torch. There is a ton of support for V8 and 4cyl design but not so much for the V twin. There was no doubt that others have looked in to this even though my searches were not providing answers, so I consulted the Superhawk brain trust.

Thanks guys,
Dave
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Old 07-17-2016, 03:10 PM
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Shortening a can on a twin usually has a negative effect, except for making it louder. The individual cylinder power pulses (that go both ways) in the exhaust of a 1000cc twin are huge compared to the pulse from say the cylinder of a 1000cc i4. Twins usually require a fairly large internal muffler volume to maintain a broad torque band and make decent hp. The magic in most exhausts is in the collector and that magic is non-existent on a stock SH header. Twin exhausts on v motors offer the tuner a chance to even out the header tube length between the front and rear cylinders too, again something that the stock SH exhaust is lacking.... JMHO...

Last edited by Fastguy59; 07-19-2016 at 01:42 PM.
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