Jamie called....
Tourer
Joined: May 2013
Posts: 483
Likes: 0
From: Wisconsin
First let me say that Jamie and the whole crew are not only top notch, but great people. He put up with my constant stupid questions and made me feel welcome on top of doing great work. I love my bike again!
Regarding the numbers, I will pull a quote from my post on roadglide.org.
Regarding the numbers, I will pull a quote from my post on roadglide.org.
Thread Starter
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Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
Likes: 6,167
From: SE Michigan
Next is 2-1-2.
Worst is duals, but some duals are better than others, V&H are among the worst, I'm told. That isnt a criticism, I'm sure appearance and sound were some of the design choices that affect how they make power.
If Jamie chimes in he can explain better, but true duals are much more free flowing, the dont yield a lot of back pressure, back pressure helps to make power.
Also the distance the exhaust needs to travel is a factor - on the V&H duals, Jamie pointed out that the distance the exhaust from the front cylinder needs to travel is twice as far as the rear cylinder, which affects scavenging.
Net is that with ported heads and true duals, the power comes on later.
Thread Starter
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Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
Likes: 6,167
From: SE Michigan
Exactly.
Tourer
Joined: Jun 2013
Posts: 323
Likes: 5
From: MA
Keith,
Thanks for the info and to be honest this is exactly what I needed as far as info. I am looking at the 107 kit from Fuel Moto. I really like the sound and look of the true duals and heard of the performance loss because of such. Your numbers are exactly what I need to see to make my decision.
Although the HP looks low, the torque looks acceptable and that is really were it counts on a bagger. I had 120lbs at 3k rpm and 100hp stuck in my head with true duals. Looks like with the 107 kit I was looking at and another batch of money for the CNC heads will get me there. Darn this internet thing and budgets.
Is the sound and look of the true duals worth the performance hit in your eyes?
Thanks again
Thanks for the info and to be honest this is exactly what I needed as far as info. I am looking at the 107 kit from Fuel Moto. I really like the sound and look of the true duals and heard of the performance loss because of such. Your numbers are exactly what I need to see to make my decision.
Although the HP looks low, the torque looks acceptable and that is really were it counts on a bagger. I had 120lbs at 3k rpm and 100hp stuck in my head with true duals. Looks like with the 107 kit I was looking at and another batch of money for the CNC heads will get me there. Darn this internet thing and budgets.
Is the sound and look of the true duals worth the performance hit in your eyes?
Thanks again
Cruiser
Joined: Mar 2014
Posts: 242
Likes: 0
From: South Florida
this may sounds stupid but what the heck, we are on the topic.
If true duals suffer from being too free flowing, wouldnt adding torque cones just take care of the issue?
If true duals suffer from being too free flowing, wouldnt adding torque cones just take care of the issue?
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Please provide a recommendation for with a brand and model number. Thanks
Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
I know a lot of people that do this very thing and works well.