Lockup clutch?
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Stage III
Joined: Mar 2012
Posts: 3
Likes: 0
From: NORTH DAKOTA
Lockup clutch?
Hello i am new to forum, and have a question I have an 07 heritage and plan on doin some upgrades and was wondering at what horse power/torque should I put in a lock up clutch?
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
I know a lot of members in here and all the bikes that I know that have cams that make mid 90's TQ and mid 80's HP still use the stock clutch.
Not sure when U'd have to go to heavier one.
Here's a Nightrider answer to Ur ?.
http://www.nightrider.com/biketech/hdclutch.htm
Q: I have installed a high performance cam in my Harley-Davidson. Do I have to add a high performance clutch for the extra power the engine puts out?
A: The stock H-D clutch assembly will handle up to 80-85 horsepower, provided the clutch plates and springs are in excellent shape. Depending upon your driving style, bolt-in cams will not cause you to change your clutch. Highly modified engines do require changes to the clutch. Additional friction area needs to be added by use of an 'extra plate' clutch pack assembly or changing to plates with additional friction area. Several vendors can provide high performance clutch components or a replacement clutch. Barnett's extra plate clutch with a heavy duty spring is an excellent choice for a street bike.
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Not sure when U'd have to go to heavier one.
Here's a Nightrider answer to Ur ?.
http://www.nightrider.com/biketech/hdclutch.htm
Q: I have installed a high performance cam in my Harley-Davidson. Do I have to add a high performance clutch for the extra power the engine puts out?
A: The stock H-D clutch assembly will handle up to 80-85 horsepower, provided the clutch plates and springs are in excellent shape. Depending upon your driving style, bolt-in cams will not cause you to change your clutch. Highly modified engines do require changes to the clutch. Additional friction area needs to be added by use of an 'extra plate' clutch pack assembly or changing to plates with additional friction area. Several vendors can provide high performance clutch components or a replacement clutch. Barnett's extra plate clutch with a heavy duty spring is an excellent choice for a street bike.
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Road Warrior
Joined: Jun 2007
Posts: 1,523
Likes: 312
From: Out of Commiefornia!
If you're not going too hog-wild, consider just getting one of the SE clutch springs. They work well, hold much better than stock, and aren't too hard to pull. I did one and it worked out great, with not much more pull than stock, and my buddy was sceptical as he had read about being hard to pull but finally tried it and found that it worked fine and wasn't too stiff at all.
Roger
Roger
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
If you tune your stock engine the most you are likely to need, to deal with the extra torque, is a stronger clutch spring. That is what I did when installing an S&S 107" engine. An S&S 124" would possibly need a new more beefy clutch, but the aftermarket has them readily available. The only situation that might call for a lock-up clutch is when drag racing IMHO.
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