Looking for advice on an engine build
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Road Warrior
Joined: Nov 2007
Posts: 1,589
Likes: 3
Looking for advice on an engine build
Hey everyone,
I am tearing down my Ultra tomorrow to put a 103" kit in it and once I am done with it I am going to be looking to do a BB kit to the Fatbob. I'm building the Ultra on the conservative side because I do some longer range trips and lower octane fuel can be a small problem. On the fatbob I am looking for something to ride primarily around town and on shorter day rides to weekend rides(less than say 700 miles a weekend). I'm looking for something that has alot of power through the mid range.
I currently have a V&H 2-1 big radius pipe, se Hi perf. a/c kit, and a pc5 from fuel moto. The bike runs alot stronger than my ultra but I'm looking for something that has a very strong mid range powerband.
I was thinking about installing:
107" Kit(brand?)
??? cams(looking for suggestions in that powerband range)
Oil cooler
adjustable pushrods
30 or 31T front pulley
Send heads off to big boyz for head work and install compression releases.
Am I on the right track for what I'm wanting? What do you guys think I should use for the engine kit and cams? Also is the front pulley gonna make the power more usable? Most of the fatbob riding is around town with some shorter interstate runs (75-80)but also sees some highway riding on the weekends which puts it around 60-65mph on average.
I have a paint set coming from vivid dragon in a few weeks and would like to do the motor work while I have the tank off. Then the only other major thing I have to figure out is a set of wheels for the fat bob.
I am tearing down my Ultra tomorrow to put a 103" kit in it and once I am done with it I am going to be looking to do a BB kit to the Fatbob. I'm building the Ultra on the conservative side because I do some longer range trips and lower octane fuel can be a small problem. On the fatbob I am looking for something to ride primarily around town and on shorter day rides to weekend rides(less than say 700 miles a weekend). I'm looking for something that has alot of power through the mid range.
I currently have a V&H 2-1 big radius pipe, se Hi perf. a/c kit, and a pc5 from fuel moto. The bike runs alot stronger than my ultra but I'm looking for something that has a very strong mid range powerband.
I was thinking about installing:
107" Kit(brand?)
??? cams(looking for suggestions in that powerband range)
Oil cooler
adjustable pushrods
30 or 31T front pulley
Send heads off to big boyz for head work and install compression releases.
Am I on the right track for what I'm wanting? What do you guys think I should use for the engine kit and cams? Also is the front pulley gonna make the power more usable? Most of the fatbob riding is around town with some shorter interstate runs (75-80)but also sees some highway riding on the weekends which puts it around 60-65mph on average.
I have a paint set coming from vivid dragon in a few weeks and would like to do the motor work while I have the tank off. Then the only other major thing I have to figure out is a set of wheels for the fat bob.
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,419
Likes: 1
From: Ashland Ore.
107" kit look at the Axtell. Heads, I've heard good things about big boyz I had Head Designs by Dewey do mine, you are on the right track with what you have posted, the biggest gains will be from the head work. Look online at head porters and check their dyno sheets. Big Boyz, Deweys, Hildreth Performance might be an option for you as he is in Alabama. Cams depends on your riding style. Many to choose from. Ask the head porter you choose what he reccomends, thats what i would do.
http://www.hildrethperformance.com/
http://www.hildrethperformance.com/
Last edited by thedonthere; Aug 18, 2009 at 04:48 PM. Reason: add link
Thread Starter
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Road Warrior
Joined: Nov 2007
Posts: 1,589
Likes: 3
Thanks for the info. The main reason I am wanting to use Big Boyz is because the guy that is gonna build my motor has dealt with him alot in the past and he took alot of time to answer some questions on my Ultra build. He seems very reputable and I don't mind waiting a little extra time just for a little extra peace of mind knowing it is right.
Outstanding HDF Member
Joined: May 2008
Posts: 2,166
Likes: 4
From: la
I would have the porter help you pick the cams and pistons to get a good match. The pulley will put the power where you want it, you might want to look into a clutch while it's out for the pulley swap, at least get the SE spring.
Elite HDF Member
Joined: Sep 2008
Posts: 4,440
Likes: 148
From: Northwest
While we're mentioning "at leasts"... at least get the SE compensator sprocket.
And JMHO, but before I went that far on the upper end, I'd build the bottom end first. Crank out to folks like Revolution or DarkHorse for truing and welding, and also a timken bearing upgrade.
And JMHO, but before I went that far on the upper end, I'd build the bottom end first. Crank out to folks like Revolution or DarkHorse for truing and welding, and also a timken bearing upgrade.
Road Captain
Joined: Feb 2009
Posts: 512
Likes: 0
From: Jacksonville, Arkansas
its same problem I get every time I build my engine in my head....
....the snow ball effect, one thing necessitates another until a cam swap becomes a entire engine build from top to bottom, if only the moco could have gave us a sturdy bottom end to build on...
....the snow ball effect, one thing necessitates another until a cam swap becomes a entire engine build from top to bottom, if only the moco could have gave us a sturdy bottom end to build on...
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