TC 117 680 Star cams

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Nov 11, 2021 | 09:05 AM

Richard Bruce

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From: Kansas

TC 117 680 Star cams

Started teardown today. Currently running HD 117 kit from 110. Do the cases have to be machined when installing S&S Flywheels or is it a direct replacement with no machining required? Live in Kansas, looking for a place to send off perhaps the Long block or just jugs and heads to achieve the ideal compression and balance everything. Running stock 110 heads and have been contemplating if they can be massaged to match the 680 Star Racing cams or would it be better to choose a different set? Bike is a B Motor or softail 2016. I want power from 5252 to 7500 redline

Nov 11, 2021 | 10:39 AM

djl

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From: san antonio

Quote:

Originally Posted by Richard Bruce

I want power from 5252 to 7500 redline

Are we reading this right?

Must assume that the bike the OP is working on is a 2016 CVO Breakout, since he didn't tell us?

S&S crank will drop in. Send the lower unit to Darkhorse to true, balance and plug your crank and machine for the Timken conversion. Talk to Scott/Hillside Cycles or Kirby/VeeTwin Performance about head work. Assume you will use your pistons/cylinders since, IIRC, the cylinders cannot be bored?

Don't know anything about the Star racing cams but compression can be worked out in the build plan for those or any other cams.

Not so sure spinning a B motor to 7200rpms is a good idea and if that is the goal, might want to weld the balancer sprocket to the crank.

Nov 11, 2021 | 12:10 PM

lightweight bob

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From: Banning, CA

Star Racing & Geo Bryce

George Bryce, owner at Star Racing, can give you better advice than you'll get on this forum. He's a no BS guy
with many years racing experience - Angelle Sampey rode for him in the past. My godson got a S&S 124"
motor installed in his 2004 bagger some years back and put out 146hp & 152tq on his chassis dyno. Real
world guy - https://mail.yahoo.com/d/folders/25/...mCZsADDUDKOPmw

Nov 11, 2021 | 12:18 PM

marcodarq

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From: florida

if you are indeed running a 2016 counterbalanced softail engine, i would re=think that rpm limit, unless this is going to be a track project and you are willing to face the failures and failure rate that that type of running will create for you. if this is a street ridden bike, you might wwant to rethink our build strategy that keeps you at 6-6.2k redline.
m

Nov 11, 2021 | 06:25 PM

Richard Bruce

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From: Kansas

Thanks for all the input. Was hoping in by putting together a solid bottom end that it would go 7k at the track a few times a year but still be rideable for short cruises with my buddies. I have been in minimal contact with Mr. Bryce who suggested 10.5-11.0 comp. I have to split the cases either way. Any thoughts on 124"? I would prefer to keep the shorter stroke to get those RPMs. As far as pistons and cylinders everything is on the table. I want perfect ring seal but part availability is also a concern. I know the balancers shouldn't be pushed past 6200 rpm. Whats the consensus on removing the balancers in exchange for a perfectly balanced flywheels, rods and pistons. I've seen a few builders say they can do it and at idle you notice but past 1500 it's smooth.

Last edited by Richard Bruce; Nov 11, 2021 at 06:35 PM. Reason: Add to

Nov 11, 2021 | 07:13 PM

djl

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From: san antonio

Quote:

Originally Posted by Richard Bruce

Whats the consensus on removing the balancers in exchange for a perfectly balanced flywheels, rods and pistons. I've seen a few builders say they can do it and at idle you notice but past 1500 it's smooth.

Don't believe it. Hard mounted motor and it's gonna shake. I don't think there such a thing as a "perfectly balanced" set of HD flywheels. I don't know anyone, personally, that has removed the counter balancers but the anecdotal information I have seen on this and other forums has not been good. I also don't believe a high strung Harley vtwin can serve both purposes, i.e., track time and cruising with the buddies but that's JMHO.

Plenty of guys here smarter than me and maybe they can provide better guidance.

Nov 15, 2021 | 08:26 AM

Big_O

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Joined: Apr 2016

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From: Illinois

I play the high strung game with my build. Its as annoying as it is fun. The 680 is a good cam for what you're looking for. Just keep the expectations and the compression modest.