View Full Version : HD SE Variable Pressure Clutch

Gas Man
04-13-2013, 12:53 AM
Not sure about this

HD SE Variable Pressure Clutch (http://www.harley-davidson.com/gma/gma_product.jsp?PRODUCT%3C%3Eprd_id=84552444878004 6&FOLDER%3C%3Efolder_id=2534374309041056&ASSORTMENT%3C%3East_id=2534374309041056&locale=en_US&bmUID=1361983050602&bmLocale=en_US)


Get more performance from the Original Equipment clutch. The Screamin' EagleŽ Variable Pressure Clutch is designed to help put the added power from a Screamin' EagleŽ Stage Kit to the pavement. This bolt-on kit harnesses the centrifugal force of spinning weights to increase the clutch capacity as engine speed increases. The mechanism applies increasing pressure to the stock clutch pressure plate as rpm rises. The result? High torque-handling capabilities without increasing clutch lever effort at idle. The Variable Pressure Clutch also provides smoother clutch disengagement at lower speed. Kit fits behind most stock derby covers with no modifications. See installation manual for additional accessory derby cover fitment information.

Read else where that it makes the Peak clutch tension increased from 120 ft. lbs. to 153 ft. lbs. without increasing clutch lever effort at idle.

Not sure... seems kinda hooky.

Bagger Dave
04-13-2013, 12:58 AM
hmm....that is interesting...but like you said...not sure about it

04-13-2013, 10:07 AM
Used to use them in car for drag racing. They have been around for years. What needs to be understood is the centrifugal part of the clutch is only activated when running higher rpm. Running around on the street unless you are screaming through the gears all the time , you really get no benefit. Harleys are fairly low rpm, high torque motors. I would put a heavier clutch with a hydraulic slave cylinder before putting this on a bike. Having said all that, never have burned up a clutch on any bike I have ever owned even the ones with dry clutches.

Gas Man
04-13-2013, 10:35 AM
Well I think is for guys that are doing higher hp/torq bikes... giving them a third option for clutch slippage.

04-13-2013, 12:25 PM
Only thing I do not like about mine (AIM) is at higher RPM clutch pull is harder like when your drag racing which I dont do. As advertized here http://www.aim-tamachi.com/home.php I wanted clutch to hold at rated H/P and tork when riding two up. Most of the guys that upgrade H/P go with the screaming eagle spring for 29 bucks but they dont like the hard pull at idle AIM is one way of solving this problem.

Gas Man
04-13-2013, 05:53 PM
Well there ya go. HD just copied off somebody else.