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post #1 of 7 (permalink) Old 04-21-2012, 01:02 AM Thread Starter
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Default Exhaust Design

So here is a question for all the wrenches and techs out there. What is the difference in performance of the multiple exhaust designs such as 2-2 and 2-1?

Before the Cross Roads all my bikes had 4-1 exhausts. I would think that the 2-1 would be more focused on torque and midrange power with the 2-2 would be focused more on the higher rpm horsepower. The reason for my thinking is that the meeting of the two exhausts would create more back pressure and the 2-2 would be more free flowing.

What got me thinking about this is that there are now two types of full exhaust systems out there for the Cross series bikes, the Bassani 2-1 and the Freedom Performance 2-2 true duals.

What do you think? Feel free to cite tech sources and studies if you so choice.

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post #2 of 7 (permalink) Old 04-21-2012, 04:55 AM
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http://www.rpwusa.net/index.php/bike.../104-true-dual me personally I am looking for a better design of a true duel exhaust. The Victory has so much room behind the rear JUG that the pipe should be piped on the other side to balance the look of the bike. Here is just one company so far that is doing this.

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post #3 of 7 (permalink) Old 04-21-2012, 09:20 AM
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2 into 1's are generally better for torque and low to mid range as stated before. They also help break up the back "wave" of the exhaust. That's why the better 2 into 2's have a small crossover. I personally like the "jake brake" sound 2 into 1's give on hard decel!
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post #4 of 7 (permalink) Old 04-21-2012, 08:18 PM
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As stated above, the 2 into1 design is about low to mid range torque. Where most of us do our riding. You'll notice the stock exhaust is for all intents and purposes a 2 into 1 design. Here is an excellent read on exhaust design. I realize that it is for HD, but the info is still valuable.

http://www.rbracing-rsr.com/exhausttech.htm

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post #5 of 7 (permalink) Old 04-21-2012, 08:24 PM
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Quote:
Originally Posted by jaysonL View Post
... You'll notice the stock exhaust is for all intents and purposes a 2 into 1 design...
Yes, what he said. And for non-believers, before you roll out the guillotine, start your motor and stand behind each of your exhaust mufflers. One of them moves about 80-90% of the CO.

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post #6 of 7 (permalink) Old 04-21-2012, 08:40 PM
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Quote:
Originally Posted by CrossRoads View Post
Yes, what he said. And for non-believers, before you roll out the guillotine, start your motor and stand behind each of your exhaust mufflers. One of them moves about 80-90% of the CO.
Well, I guess what I was referring to was my bike. Or, non touring models.

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post #7 of 7 (permalink) Old 04-22-2012, 08:35 AM
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One thing left out is the that 2 into 2 can be tuned for more midrange power ,a 2 into1 has a broader power range and are more flexible a 2 into 2 is more affected by other factors such as pipe length, header size etc. You can make a 2 into 2 with good midrange.
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