When to Beef Up Clutch?
Road Captain
Joined: May 2015
Posts: 627
Likes: 47
From: Nunda
When you are throttling it and the RPMS are going faster but the wheel isn't.
Weight
Tire grip
Suspension settings
Torque
Are all factors
The weak link will give traction or clutch.
I would not say there is a specific "stage level"
When you need a stronger clutch you will feel it
Weight
Tire grip
Suspension settings
Torque
Are all factors
The weak link will give traction or clutch.
I would not say there is a specific "stage level"
When you need a stronger clutch you will feel it
Road Warrior
Joined: Aug 2007
Posts: 1,392
Likes: 43
From: South Australia
my clutch slipped when I went to 106 with S&S 585 cams, tune was at 98/115 then so fitted the heavy SE spring and it fixed it.
with the next build being quite stronger I fitted the AIM VPC as well as the SE spring and with the tune at around 121/121 it hasn't slipped.
hope that helps
with the next build being quite stronger I fitted the AIM VPC as well as the SE spring and with the tune at around 121/121 it hasn't slipped.
hope that helps
Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
when your driving thru the clutch,its time for a up grade (and to the previous post,if your clutch is easily slipping just with the addition of 255 cams,it isn't adjusted right,wrong fluid or some other problem)
Club Member
Joined: Jul 2014
Posts: 11,469
Likes: 3,572
From: Idaho
Seasoned HDF Member
Joined: Mar 2009
Posts: 24,728
Likes: 9,233
From: Snow Hill, NC
On my 07 I had the stock clutch for 92000 miles it slipped a few times but on long uphill pulls passing a car after 500 miles on the road that day...just needed adjustments. I did swap with a Barnett set up and it grabs better but my stock clutch looked awesome when I took it out. I was extremely surprised.
This was running a set of Andrews 26H with a Power commander 5. 255 lbs.
This was running a set of Andrews 26H with a Power commander 5. 255 lbs.
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Grand HDF Member
Joined: May 2010
Posts: 3,599
Likes: 5,175
From: SWMO
Had some head work done, upped comp., and pretty mild Andrews 57's in a 103. Was doing some fairly spirited riding in twist, hilly country and smoked the stock clutch. So badly in fact, I was in 3rd gear to get it back to the house. Wouldn't hold 4th, 5th, or 6th.
Alto Carbonite's and Barnett heavy spring fixed that problem. Then Mueller Power Clutch fixed the heavy spring issue. All good since.
Alto Carbonite's and Barnett heavy spring fixed that problem. Then Mueller Power Clutch fixed the heavy spring issue. All good since.
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The screamin eagle diagram spring is only like $35 so why not just throw it on with your next oil change. I agree with what has been said about your stock clutch being bad if it's slipping with just a cam upgrade.
I'm running the Barnett with SE spring on a twin cam 88 worked over for about 100hp.
I'm running the Barnett with SE spring on a twin cam 88 worked over for about 100hp.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,114
Likes: 7,638
From: Poolville
When ever you increase the power of a motor you should always look upgrading the stock setup and with that I'm not saying just by adding a spring for more pressure. The whole clutch assembly will need to be addressed.
With more power and slippage you will create more heat and this heat can warp the steels creating long term affects. If your gonna upgrade because of a 20% increase in horse and torque do the entire clutch. Friction plates, steels and use packages that have a thicker a pressure plate and stronger springs. Less prone to warpage from heat. Yea it'll be a stiffer clutch pull but hey you wanted the power....
With more power and slippage you will create more heat and this heat can warp the steels creating long term affects. If your gonna upgrade because of a 20% increase in horse and torque do the entire clutch. Friction plates, steels and use packages that have a thicker a pressure plate and stronger springs. Less prone to warpage from heat. Yea it'll be a stiffer clutch pull but hey you wanted the power....