Dumb question.
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Tourer
Joined: Nov 2007
Posts: 349
Likes: 0
From: Arizona
Dumb question.
I have a question concerning the pipe design on touring bikes. Just what exactly is the purpose for the crossover tube on my electraglide exhaust?. It seems to make no sense. Why not just have one pipe dedicated to each cylinder?. Most of the exhaust comes out of the right pipe, at least 80% of it seems to anyway.
I did a little experiment and found suprising results. First of all I have V&H 4" hollow slip-ons (bad azz sound) and when at an idle I held a paper towel at the end of the left pipe and it wanted to suck the paper towel in the tube. Tells me the right pipe is creating a vacuume or a venturi effect of some sort on the left pipe. I hear alot of talk about getting rid of air leaks in the exhaust system but it would seem to me that the crossover tube is nothing more than one big airleak.
I am new to Harleys so please excuse me for the dumb question but it is bugging the chit outta me as to why this design.
Also is the true duals a good pipe?
I did a little experiment and found suprising results. First of all I have V&H 4" hollow slip-ons (bad azz sound) and when at an idle I held a paper towel at the end of the left pipe and it wanted to suck the paper towel in the tube. Tells me the right pipe is creating a vacuume or a venturi effect of some sort on the left pipe. I hear alot of talk about getting rid of air leaks in the exhaust system but it would seem to me that the crossover tube is nothing more than one big airleak.
I am new to Harleys so please excuse me for the dumb question but it is bugging the chit outta me as to why this design.
Also is the true duals a good pipe?
Road Master
Joined: Jan 2007
Posts: 1,063
Likes: 1
From: Alabama Gulf Coast
I have a question concerning the pipe design on touring bikes. Just what exactly is the purpose for the crossover tube on my electraglide exhaust?. It seems to make no sense. Why not just have one pipe dedicated to each cylinder?. Most of the exhaust comes out of the right pipe, at least 80% of it seems to anyway.
I did a little experiment and found suprising results. First of all I have V&H 4" hollow slip-ons (bad azz sound) and when at an idle I held a paper towel at the end of the left pipe and it wanted to suck the paper towel in the tube. Tells me the right pipe is creating a vacuume or a venturi effect of some sort on the left pipe. I hear alot of talk about getting rid of air leaks in the exhaust system but it would seem to me that the crossover tube is nothing more than one big airleak.
I am new to Harleys so please excuse me for the dumb question but it is bugging the chit outta me as to why this design.
Also is the true duals a good pipe?
I did a little experiment and found suprising results. First of all I have V&H 4" hollow slip-ons (bad azz sound) and when at an idle I held a paper towel at the end of the left pipe and it wanted to suck the paper towel in the tube. Tells me the right pipe is creating a vacuume or a venturi effect of some sort on the left pipe. I hear alot of talk about getting rid of air leaks in the exhaust system but it would seem to me that the crossover tube is nothing more than one big airleak.
I am new to Harleys so please excuse me for the dumb question but it is bugging the chit outta me as to why this design.
Also is the true duals a good pipe?
Last edited by Deepsouth251; Mar 8, 2009 at 07:18 AM.
Ultimate HDF Member
Joined: Sep 2006
Posts: 8,423
Likes: 2
From: Ellenwood, GA - The Ghetto Part
Kind of like the question: "What's the best seat for xxxx bike?" Everyone will have different opinions.
And I know someone more technically/mechanically inclined will come aboard and provide facts regarding true duals vs. stock setup vs. aftermarket slip-ons vs. whatever. That's okay.
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,206
Likes: 372
From: Central Illinois, Between I-80 and I-74
Two into one has advantages over true duals, the cross over probably has similar effect.
There are some makers that sell 2 into 1 exhaust with a fake pipe for the left side that still gives the balanced look of duals.
There are some makers that sell 2 into 1 exhaust with a fake pipe for the left side that still gives the balanced look of duals.
Road Master
Joined: Jun 2007
Posts: 976
Likes: 1
From: Sutherlin, Oregon
Road Master
Joined: Jan 2007
Posts: 1,063
Likes: 1
From: Alabama Gulf Coast
The new design on the 09's where the cross over goes under the bike and in front of the rear tire (the so called 2 into 1 into 2) is showing dyno numbers with just slip ons that is an improvement over the design it replaced. This is according to several tuners I have talked to. It would be interesting to know if MOCO planned it that way as the way I understand it is, it was changed to help address heat issues.
Last edited by Deepsouth251; Mar 8, 2009 at 05:33 PM.
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Seasoned HDF Member
Joined: Dec 2003
Posts: 7,090
Likes: 3,882
From: Murfreesboro , TN
I have a question concerning the pipe design on touring bikes. Just what exactly is the purpose for the crossover tube on my electraglide exhaust?. It seems to make no sense. Why not just have one pipe dedicated to each cylinder?. Most of the exhaust comes out of the right pipe, at least 80% of it seems to anyway.
I did a little experiment and found suprising results. First of all I have V&H 4" hollow slip-ons (bad azz sound) and when at an idle I held a paper towel at the end of the left pipe and it wanted to suck the paper towel in the tube. Tells me the right pipe is creating a vacuume or a venturi effect of some sort on the left pipe. I hear alot of talk about getting rid of air leaks in the exhaust system but it would seem to me that the crossover tube is nothing more than one big airleak.
I am new to Harleys so please excuse me for the dumb question but it is bugging the chit outta me as to why this design.
Also is the true duals a good pipe?
I did a little experiment and found suprising results. First of all I have V&H 4" hollow slip-ons (bad azz sound) and when at an idle I held a paper towel at the end of the left pipe and it wanted to suck the paper towel in the tube. Tells me the right pipe is creating a vacuume or a venturi effect of some sort on the left pipe. I hear alot of talk about getting rid of air leaks in the exhaust system but it would seem to me that the crossover tube is nothing more than one big airleak.
I am new to Harleys so please excuse me for the dumb question but it is bugging the chit outta me as to why this design.
Also is the true duals a good pipe?
Are true duals good? It all depends on who you ask. If you are looking for the best increase for horsepower, then most likely not. 2-1 pipes typically generate the best power increases. True duals can give you more torque sometimes though. Not to mention the look and sound!
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Elite HDF Member
Joined: Nov 2006
Posts: 3,909
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From: Livingston, Texas
Yep the crossover pipe is for bottom end torque, go with true duals and you will loose bottom end torque. Got two buddy that I is experiencing that after he went with reinheart true duals. One has gone with a two and one and found out how much power difference there is. The other is stuck on what direction he will go. Mabe trade the bike.
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