Stock exhaust head pipes - Kawasaki Vulcan Forum : Vulcan Forums
 
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post #1 of 7 (permalink) Old 08-22-2016, 09:03 AM Thread Starter
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Lightbulb Stock exhaust head pipes

Ok, These may be the dumbest questions ever asked on this forum. But, as a retired person I have a lot of time to daydream and tinker.

I have removed the first two baffles from my '13 Vulcan 1700 Nomad mufflers. I am not looking for more volume. I want to keep the catalytic converters intact. What I am wondering about is finding a way to convert the head pipes to a true dual exhaust. I have done Ivan's ECU flash.

I think the stock head pipes could be modified to make this happen and even keep the chrome shields where they are. Has anyone ever considered this? What would the affect of this be on the sound of the pipes? Is there any advantage to true duals as opposed to 2-1-2?

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post #2 of 7 (permalink) Old 08-22-2016, 07:36 PM
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Hmm, I've been on this forum a long time and I don't remember reading of anyone doing that.

The only true duals I know of is the ones built in US.


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post #3 of 7 (permalink) Old 08-22-2016, 08:07 PM
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From a pure performance point of view the 2 into 1 is the best from what I have read. Freedom Performance VAQUERO | NOMAD ||DUALS RACING 4? -Freedom Performance Exhaust makes a set that some swear by but just look odd to me because instead of evening out the pipe lengths by taking the rear jug pipe under the bike they do the opposite and exaggerate the longer front pipe by taking it under the bike. Like you say I think it could be done using the stock shields. The bike would probably need to be dyno tuned after the work though.

Let us know if you take this project on I would like to know the outcome

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post #4 of 7 (permalink) Old 08-25-2016, 07:08 AM Thread Starter
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From a pure performance point of view the 2 into 1 is the best from what I have read. Freedom Performance VAQUERO | NOMAD ||DUALS RACING 4? -Freedom Performance Exhaust makes a set that some swear by but just look odd to me because instead of evening out the pipe lengths by taking the rear jug pipe under the bike they do the opposite and exaggerate the longer front pipe by taking it under the bike. Like you say I think it could be done using the stock shields. The bike would probably need to be dyno tuned after the work though.

Let us know if you take this project on I would like to know the outcome
I am still considering the project. I do wish I had some expert advice on the effect on the engine. I plan to call Ivan and see whether he thinks the ECU will handle it ok. I have bought a used set of Nomad head pipes to help figure out how to do it. Later..

2013 Kawasaki Vulcan Nomad 1700
Ultimate Seat with Driver Backrest
Ivan's ECU flash 2
Freedom performance Slip on mufflers
Luverne Kawasaki Lowering Kit
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post #5 of 7 (permalink) Old 08-25-2016, 07:25 AM
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True duals may look cool, but I'm pretty sure you would lose power unless they were very long and balanced in length...even then they would likely not perform as well as a good 2-into-1 (as previously noted) or a system with a crossover pipe.

That's why most motorcycle dual exhausts have a crossover pipe and most cars have an x-pipe...
The crossover helps with exhaust scavenging and improves performance.

Personally, I think you are looking for a project, but you may be wasting your time on something that does not need to be fixed!
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post #6 of 7 (permalink) Old 08-25-2016, 07:45 AM Thread Starter
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True duals may look cool, but I'm pretty sure you would lose power unless they were very long and balanced in length...even then they would likely not perform as well as a good 2-into-1 (as previously noted) or a system with a crossover pipe.

That's why most motorcycle dual exhausts have a crossover pipe and most cars have an x-pipe...
The crossover helps with exhaust scavenging and improves performance.

Personally, I think you are looking for a project, but you may be wasting your time on something that does not need to be fixed!
Performance is the only reason I am interested in considering this. What I'm proposing would look exactly as the stock system looks, so there is no "look cool" factor. I admit that I am looking for a project, but I don't want to waste my time if there is no performance gain. I guess I considered that true duals would increase performance. I need to do more reading, but thanks for the input.

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post #7 of 7 (permalink) Old 08-25-2016, 11:30 AM
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Generally speaking, there are no performance advantages from true duals on anything less than a full blown race engine.
A good 2-into-1, 3-into-1, 4-into-1 exhaust (depending on total cylinders) will produce more overall power than using an individual pipe/muffler for each cylinder.

You might gain a very small amount of power at the extreme upper RPM range, but the power lost below that range will outweigh any gain.
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