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Author Topic:   Diaphram clutch, What do you think of them?

Posts: 133
From: California
Registered: Dec 2001

posted 03-27-2003 11:34 AM     Click Here to See the Profile for Skeeter   Click Here to Email Skeeter     Edit/Delete Message   Reply w/Quote
How are these on a 500hp motor?


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Posts: 1460
From: Athens,GA
Registered: Jul 2001

posted 03-27-2003 06:07 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
Good for street/strip up to 6000 rpms, but they tend to loose their easy shifting ablility after that. Just remember that the 500 HP is probably high up in the rpm scale where you need the clutch the most. I would use a high performance Long style or something similar with centrifugal assist. Don't ask me how I know.

1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
2nd pass: 12.11 @ 114 mph

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Posts: 195
From: Maryland
Registered: Apr 2000

posted 03-27-2003 07:49 PM     Click Here to See the Profile for bifs66   Click Here to Email bifs66     Edit/Delete Message   Reply w/Quote
I have the 10.5" Centerforce DF (late model Mustang type) in the 66 Fastback; but I don't have anything close to 500 HP with the 342" stroker. This clutch worked very well with street driving and was smooth with easy pedal effort. This was with the totally stock clutch pedal setup including the Z-bar. However, when I took it to the strip, I found that the pedal stayed on the floor when I shifted at 6000 rpms until the rpms dropped back a little (thanks to the MSD rev limiter, nothing was hurt). This was because the centrifugal assist in the pressure plate and the big, underdash "over-the-center" pedal spring combined to overcome the pressure plate's ability to return the pedal at high rpms. I disconnected the big underdash spring which acts to pull the pedal up and also to push it down. I called Centerforce and they recommended removing the spring. However, on the 66, this is the only spring that returns the pedal all the way up to provide the pedal free play (keeps the throwout bearing off the clutch fingers). I added a small spring (like I think the 65s have) under the hood to pull the pedal all the way up. Now,
everything is great. I like this setup as it doesn't put any strain on the original type Z-bar linkage as would probably happen with a HD Long-type clutch.

Bernie Frank
66 Fastback restomod project
85 GT (preserved)
82 GT (original)

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