Big Bore Conversion Twin Cam B
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Joined: Sep 2006
Posts: 3,710
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From: San Ramon, Ca
Big Bore Conversion Twin Cam B
Question for those that have upgraded from 88 to 95 (or from 96 to 103)
Any change in cruising speed vibration? I'm wondering if they have changed those counter balancers to compinsate for the larger pistons and longer stroke for the 96" models.
I'm considering the 95" kit for my 2000. I would just like some input as far as any down side, like vibration. I would probably also change to geardrive cams. And a Mikuni 42.
I appreciate any input.
Any change in cruising speed vibration? I'm wondering if they have changed those counter balancers to compinsate for the larger pistons and longer stroke for the 96" models.
I'm considering the 95" kit for my 2000. I would just like some input as far as any down side, like vibration. I would probably also change to geardrive cams. And a Mikuni 42.
I appreciate any input.
Cruiser
Joined: Mar 2008
Posts: 144
Likes: 2
From:
RE: Big Bore Conversion Twin Cam B
I have the 96B motor and was thinking of going to 103. I was concerned about the vibration also. I was also wondering if I would be creating more heat problems with the cylinders bored out to 103
Cruiser
Joined: Oct 2007
Posts: 112
Likes: 0
From:
RE: Big Bore Conversion Twin Cam B
Give Hillside Machine a call. Scott did mine this winter and very happy. Should have done this earlier. Smoother running, engine temp down, great torq. 
All good here. No more vibration than when stock. Maybe less. Happy riding.
All good here. No more vibration than when stock. Maybe less. Happy riding.
Seasoned HDF Member
Joined: Nov 2004
Posts: 8,129
Likes: 1,981
From: Ottawa, CANADA
RE: Big Bore Conversion Twin Cam B
I had Reaper's 88" B engine punched out to 95" (@ 10.5:1 compression) this winter, and I have noticed no additional vibration. I'm still breaking it in, too.
Cheers!
[sm=icon_rock.gif][sm=icon_rock.gif][sm=icon_rock.gif]
Cheers!
[sm=icon_rock.gif][sm=icon_rock.gif][sm=icon_rock.gif]
Stellar HDF Member
Joined: Nov 2005
Posts: 2,272
Likes: 10
From: Orange VA
RE: Big Bore Conversion Twin Cam B
The SE kits specifically state that no re-balancing is required so that would indicate to me that there would not be additional vibration. Some of the aftermarket kits like HQ, etc (might) run into some vibration but if they are kit setups they most likely have been tested as well.
I think where you might run into issues is if you were to go with an a-la-carte build where you picked your own combination of pieces parts to do your build. Some combinations could create different harmonic freqs at specific or ranges of RPM's that could create noise and/or vibration. It's really hard to say though. You really won't know 100% for sure unless you build it.
I think where you might run into issues is if you were to go with an a-la-carte build where you picked your own combination of pieces parts to do your build. Some combinations could create different harmonic freqs at specific or ranges of RPM's that could create noise and/or vibration. It's really hard to say though. You really won't know 100% for sure unless you build it.
Outstanding HDF Member
Joined: Oct 2007
Posts: 2,018
Likes: 6
From: Edmond, Ok
RE: Big Bore Conversion Twin Cam B
I have an '07 Softail Standard that I had bumped from 96" to 103". No problems so far, and I've noticed no additional vibration.
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Cruiser
Joined: Feb 2006
Posts: 179
Likes: 0
From: San Diego
RE: Big Bore Conversion Twin Cam B
96"-103" Best mod !
No additional vibration except the wind at 135MPH
No additional vibration except the wind at 135MPH
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Outstanding HDF Member
Joined: Jan 2006
Posts: 3,015
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From: Alaska
RE: Big Bore Conversion Twin Cam B
Took my 88 B to a 95 B. She got cylinders, pistions, and cams. No new balancer. No noticeable increase or decrease from the vibe that was already there. She is an 03 carbed model.