100" Big Bore Build
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Novice
Joined: Dec 2018
Posts: 19
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From: NJ
100" Big Bore Build
Hi guys, first of all , HAPPY NEW YEAR !
I am planning a 100" BB kit on my '06 FXSTI
It's all stock at the moment. I want to do the left side Timken bearing kit, S&S stock stroke crankshaft, S&S 100" BB (aluminum finish), S&S cams, S&S camplate and pump, and S&S high flow heads.
Later down the road, I will do performance intake and bigger TB. Shooting out my present V&H straightshots. Just looking for a bunch more power, but keeping it low compression and able to take long trips.
I am trying to line up all the parts but not sure what heads to get for this and what size cams would be right.
As far as heads, i like S&S and also want the same aluminum finish as the jugs.
Thanks in advance
I am planning a 100" BB kit on my '06 FXSTI
It's all stock at the moment. I want to do the left side Timken bearing kit, S&S stock stroke crankshaft, S&S 100" BB (aluminum finish), S&S cams, S&S camplate and pump, and S&S high flow heads.
Later down the road, I will do performance intake and bigger TB. Shooting out my present V&H straightshots. Just looking for a bunch more power, but keeping it low compression and able to take long trips.
I am trying to line up all the parts but not sure what heads to get for this and what size cams would be right.
As far as heads, i like S&S and also want the same aluminum finish as the jugs.
Thanks in advance
Thread Starter
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Novice
Joined: Dec 2018
Posts: 19
Likes: 1
From: NJ
Thought about actually throwing in a 4-5/8 , as I WAS going to do the 124 but changed my mind not to mod the case beyond timken swap. Not going to race this thing , just want more out of it.
If I had more bikes and a deeper pocket , i might give it a shot, but I'm thinking a stock throw would be more reliable and last longer.
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
The only thing I can say about the 100" kit from S&S is you might wanna research it a bit first. I believe there was a couple on here who had scuffing issues. Whether or not that was S&S's fault is up to debate.
Regardless, good luck with the build. Sounds fun!
Regardless, good luck with the build. Sounds fun!
Road Warrior
Joined: Oct 2013
Posts: 1,399
Likes: 1,040
From: Seabrook, NH
My friend and I upgraded his 2002 Deuce to the S&S 116 BB kit back in 2004. The bike is still running great today. I highly recommend you speak with Hillside Cycles about their kit.
Its probably very close to the same money as the 100" kit. http://hillsidecycle.com/engine-kits/116-twin-cam/
Its probably very close to the same money as the 100" kit. http://hillsidecycle.com/engine-kits/116-twin-cam/
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Novice
Joined: Dec 2018
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From: NJ
if you went with a 4.375" FW,you can go 107" or 110",kinda a no brainer.would be the same price as going 100
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We bore the QE cylinders using our proprietary HMM 98" Big Bore Kit. (you save about $450.00 over the S&S kit)
Firing a 98" Dyna off today, our Stage II Heads, S&S .570 cams.
Installing a 4 3/8" S&S cranshaft, along with boring your cylinders to 107" is a great power upgrade.
Finished one of those week before Christmas....Wood 555 he had, our Stage II Screamin' Eagle head upgrade work........115 hp/120 ft/lbs. Wideband torque on that one.
Posting the dyno report on the company Facebook this week.
Scott
Firing a 98" Dyna off today, our Stage II Heads, S&S .570 cams.
Installing a 4 3/8" S&S cranshaft, along with boring your cylinders to 107" is a great power upgrade.
Finished one of those week before Christmas....Wood 555 he had, our Stage II Screamin' Eagle head upgrade work........115 hp/120 ft/lbs. Wideband torque on that one.
Posting the dyno report on the company Facebook this week.
Scott
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From: deland,florida
"not sure if I would gain more than more than I lose" (???) not understanding this at all.a 4.375 stroke is what the 96" & 103"`s have,best way for reliability is displacement,bigger motors can be built a lot more mild to make the same (or more) HP/TQ of a more aggressive built smaller motor
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Novice
Joined: Dec 2018
Posts: 19
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From: NJ
Hillside, forgive me don't know the technical mathematics of building an engine too much, but I am learning. Is that 98" bore + 4.375 stroke = 107"?
I see you mentioned boring my cylinders to 107, which I don't want to bore the case.
Just thinking that with more vibration from the bigger stroke would take a bit of a toll on longevity, but I guess you're right HD using them in the newer engines.
If the displacement math is substantial, then you and Hillside are leaning me right into one
And I am sure Hillside does some excellent work from what I've read already, but I'm kind of set in getting S&S cyl.s and heads.
If I did the 100" bb and 4.375 stroke, what would my displacement be around and also could I use the same pistons from the S&S bb kit?
May want to have Hillside do my bottom end when time comes.
I see you mentioned boring my cylinders to 107, which I don't want to bore the case.
"not sure if I would gain more than more than I lose" (???) not understanding this at all.a 4.375 stroke is what the 96" & 103"`s have,best way for reliability is displacement,bigger motors can be built a lot more mild to make the same (or more) HP/TQ of a more aggressive built smaller motor
If the displacement math is substantial, then you and Hillside are leaning me right into one
And I am sure Hillside does some excellent work from what I've read already, but I'm kind of set in getting S&S cyl.s and heads.
If I did the 100" bb and 4.375 stroke, what would my displacement be around and also could I use the same pistons from the S&S bb kit?
May want to have Hillside do my bottom end when time comes.
Last edited by reinhold; Jan 2, 2019 at 04:57 PM. Reason: forgot something