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09-06-2007, 08:32 PM
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CC Member
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Join Date: Jan 2002
Location: Lakeland,
FL
Cobra Make, Engine: ERA 427SC FMS 351W
Posts: 199
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Not Ranked
Which Clutch Disk ???
My new TKO600 (with the .82 OD gear) has arrived. My ERA Cobra has a 425HP 351W FMS crate engine and a 3:31 jag rear. The car is relatively light at 2500 lbs so ERA recommends a "standard pressure clutch".
I ordered a RAM Powergrip, model 98794T, with the transmission. The clutch disk is organic on one side and sinter iron on the other side (pressure plate side). I have been told in a light weight car with a lower numical rear gear (3:31) that this disk will grap very quickly and will chatter immediately prior to engagement.
I drive the car on the street and very infrequently at Sebring. I want a smooth engaging clutch with near normal clutch petal effort. An hydraulic system operates the clutch with an external slave cylinder. I want to keep this set-up.
My question is what brand and part number clutch kit or pressure plate and disk should I install?
I understand the newest tech is the twin disks that provide nearly twice the surface contact space so that you can achieve higher grip and stay with organic disks for smooth engagments. Sounds good but likely a bit too much for my needs.
What single disk / pressure plate set-up should I use for my application? Should I consider the RAM 88794HDT which is advertised as a premium clutch replacement kit with organic on both sides of the disk? I heard I should use a disk with kevlar material like the Superior disk. I heard the Centerforce PP can be trouble due to the centrifical weights. ERA uses Weber which I believe is a McLeod product.
What is the best set-up for me?
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09-06-2007, 11:40 PM
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CC Member
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Join Date: Jul 2003
Location: Redmond,
WA
Cobra Make, Engine: Superformance Brock Coupe
Posts: 178
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Not Ranked
Even before considering the material for the driven disc I'd be sure you consider a sprung hub. For your application I believe that organic material both sides is best. With the weight of your car you could easily use a stock clutch disc from a high performance Mustang. The sprung hub is often shunned because "racers use solid centers" but years of experience has shown that sprung hubs make for less shock loads on the transmission and help match revs when shifting. Badger.
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09-07-2007, 01:26 PM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Not Ranked
I have a centerforce dual friction clutch in my build. Over 25k miles with some open track time and it is like new. I had to yank the motor last year and I checked the clutch plate with a micrometer. Barely any wear on it.
Roscoe
__________________
Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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09-07-2007, 04:18 PM
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CC Member
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Join Date: Jan 2002
Location: Lakeland,
FL
Cobra Make, Engine: ERA 427SC FMS 351W
Posts: 199
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Not Ranked
Roscoe, got any Centerforce part numbers?
Roscoe, got any Centerforce part numbers for the disk and pressure plate?
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09-09-2007, 10:52 AM
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CC Member
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Join Date: Mar 2000
Location: Fairfield, NJ, USA,
NJ
Cobra Make, Engine: A & C, 351W, Tremec 3550. Exiled Member: Club Cranky
Posts: 5,897
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Not Ranked
__________________
Roscoe
"Crisis occurs when women and cattle get excited!"....James Thurber
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09-09-2007, 10:58 AM
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CC Member
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Join Date: Jul 2007
Location: Waterford,
PA
Cobra Make, Engine:
Posts: 1,384
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Not Ranked
In the 2 low 12 sec mustangs I've owned, I had spec stage 2 and a king cobra. The spec was a bit firmer, but never had any problems with either. I will most likely use the spec again in my 408
Josh
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09-09-2007, 11:12 AM
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Senior Club Cobra Member
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Join Date: Jul 2007
Location: Odessa (Tampa),
FL
Cobra Make, Engine: BDR 559. 410 Stroker 72 block AFR205 Heads, Solid roller lifters, Comp Cams XR286, Eagle 4" stroke internally balanced with chevy journals, Oliver rods, Probe Forged pistons, Mighty Demon, Super Victor, MSD Digital 6.....
Posts: 260
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Not Ranked
__________________
BDR 559
Indigo Blue, White Stripes
SBF 410
TKO 600 .82 OD (Road Race)
HP= Enough!!
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09-09-2007, 11:27 AM
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CC Member
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Join Date: Jul 2007
Location: Waterford,
PA
Cobra Make, Engine:
Posts: 1,384
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Not Ranked
Good call! That didn't even dawn on me!
Both of my options will not work as they are 10 spline.
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Bagram AF Afghanistan
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09-09-2007, 11:35 AM
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CC Member
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Join Date: Nov 2000
Location: Tucson,
Az
Cobra Make, Engine: Superformance 427 Side-Oiler
Posts: 2,156
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Not Ranked
Although some folks are running Centerforce with success,McLeod & Ram are better units.I wouldn't put a Centerforce on a mini-bike.
__________________
The rest of the world can have their opinion about the United States just as soon as WE give it to them.
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09-09-2007, 12:35 PM
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CC Member
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Join Date: Feb 2005
Location: Perrysburg,
OH
Cobra Make, Engine: SPF #298 427 FI
Posts: 497
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Not Ranked
Quote:
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Originally Posted by fsstnotch
In the 2 low 12 sec mustangs I've owned, I had spec stage 2 and a king cobra. The spec was a bit firmer, but never had any problems with either. I will most likely use the spec again in my 408
Josh
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Another vote for spec. I have a mcLeod in my Cobra and a spec in the mustang. For a streat clutch spec would be my choice. Most of the mustang guys I know swear by the spec. |
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