True duals/headers
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Tourer
Joined: Jun 2007
Posts: 267
Likes: 11
From: Oklahoma City
True duals/headers
Forgive my ignorance about the more recent model twin cams, including the Rushmores, since I am fresh off an '06 RK with the TC88. But why is it that you hardly ever see a later model with the older style true duals - meaning the rear header coming out the left side and down behind the primary on its way underneath the saddlebag? Is there something in the design of the later models that requires the pipes to route underneath instead of the previous layout?
Thanks in advance.
Thanks in advance.
Cruiser
Joined: Apr 2006
Posts: 149
Likes: 0
From: Western PA
Forgive my ignorance about the more recent model twin cams, including the Rushmores, since I am fresh off an '06 RK with the TC88. But why is it that you hardly ever see a later model with the older style true duals - meaning the rear header coming out the left side and down behind the primary on its way underneath the saddlebag? Is there something in the design of the later models that requires the pipes to route underneath instead of the previous layout?
Thanks in advance.
Thanks in advance.
Although the true dual setup looks pretty cool.....
Road Warrior
Joined: Jun 2014
Posts: 1,745
Likes: 36
From: Lafayette La
Forgive my ignorance about the more recent model twin cams, including the Rushmores, since I am fresh off an '06 RK with the TC88. But why is it that you hardly ever see a later model with the older style true duals - meaning the rear header coming out the left side and down behind the primary on its way underneath the saddlebag? Is there something in the design of the later models that requires the pipes to route underneath instead of the previous layout?
Thanks in advance.
Thanks in advance.
True duals as you mentioned sound better (some say) but do not tune as ease and maybe a very small HP difference vers the power duals. Maybe because of the new popular flash tuners and the generic maps, although with the FP3 you can choose between the two. But also I understand if you dyno/tune the bike you probably will never know the difference. So neither is a bad chose, it's like owning a Harley, it all in what you like and how it make you feel that matters.
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Tourer
Joined: Jun 2007
Posts: 267
Likes: 11
From: Oklahoma City
I understand that the crossover yields better results, everything else being equal. I'm really just curious why the shift to running the pipes underneath and the reason for staying with that design when converting to duals. I was under the impression that one of the reasons was originally for better heat management. I was hoping someone here could enlighten me as to the reason(s), since I really don't know and would like to understand it better before I start modifying the new bike. Has anyone gone back to the older design or configuration of the headers when converting to duals on their newer-design bike?
Extreme HDF Member
Joined: Jun 2007
Posts: 12,653
Likes: 18
From: Broken Arrow, Oklahoma
From what I understand, they did away with the rear cylinder's pipe going behind the cylinder and coming out and then down on the left side due to heat on the passenger's leg. Probably got a lot of complaints about burned legs, etc.,.
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Tourer
Joined: Jun 2007
Posts: 267
Likes: 11
From: Oklahoma City
Makes sense....so maybe there's no new mechanical or performance reason for true duals vs. crossover than there ever was, just a heat issue. Perhaps there's enough heat management improvement that most or all of the aftermarket offerings are routed under the frame for the same reason.
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Road Warrior
Joined: Sep 2014
Posts: 1,872
Likes: 1,325
From: DeLand, Florida
I have wondered the same thing. I know the stock pipes come together on the right side for the Cat as it is expensive and having two would cost more. Also this routing under is a good way to keep the heat away from the computer area under the seat. As we all know those Cats get hot.
Road Captain
Joined: Nov 2007
Posts: 504
Likes: 2
From: NE IOWA
We had the old school duals on our 12 Ultra. The left heat shield has to be modified. The reason we went with the cobra duals on our 15 was I did not like how close it was to the starter. So to answer they are out there but I think people are more aware of the power ban than in the past.