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My South Bend CLutch failure (Pics inside)

bNasty

Proven Member
669
3
Jan 15, 2009
Chantilly, Virginia
So if some of you have been following my build or friends with me on FB you will see that I was dynoed last week and you will have also seen that my SBC clutch took a dump. The hub basically broke and 1 spring popped out and 1 spring broke in half. This occurred after a 400+ hp dyno pull.

My question really is. What causes the springs to come out like this. And after my ACT clutch failure two months ago (stripped splines in hub of clutch) I had the shaft checked and everything was ok. Im just curious why I keep having clutch problems like this.

Now for the pics

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e85_4g63

Proven Member
1,492
13
Nov 17, 2008
Manheim, Pennsylvania
I had the EXACT same issue, with SBC's kevlar disc. Even Tim Zimmer (twicks69 on here) spoke highly of that particular disc. Springs broke out on mine (16g @ 14psi). Not sure what's up...
 

96awd

Proven Member
1,190
4
Dec 5, 2009
Bourbon, Missouri
I sent this thread in a PM for Tim to chime in.

I'm kind of skeptical about using SBC now. May just go for a Twin-Disk and call it a day now.
 

twicks69

Supporting Vendor
4,104
1,410
Mar 12, 2004
Milwaukee, Wisconsin
Probably a bad batch or the result of a prior mis-shift, or during installation the transmission was putting weight on the clutch disk hub and you bent the hub.

The failure rate on SBC's clutches are crazy low in comparison with their competitors.

The SSX clutch setups use the better EXEDY racing disk hub that has the springs and isolator bushings.


Who is BNasty? Is this one of my customers? Either way, contact SBC or the vendor you purchased from and get it replaced under warranty.
 

95eclipser

Proven Member
2,015
319
Feb 3, 2006
Manassas, Virginia
The pull was made on a Dyno Dynamics Dyno at PTUNING.

The failure of the clutch was noticed after a pull was completed (20psi about 389hp). The tuner had turned off the car to flash over the new changes to the map. Once this was complete we pushed in the clutch to start the car, and the tuner noticed the intense force needed to push it in.

Are first thought was a clutch spring had popped lose. I was a lil surprised as the clutch had made about 9 good pulls before the incident occurred. i have seen CM clutches do this, but this is my first SSX iv seen.

hope this helped give a lil better back ground.

P.S. I was the one who checked the car in, and drove it around back. The clutch engaged completely fine and had very smooth transition through the gears.

Drew
 

dsm8883

Proven Member
239
1
Dec 19, 2004
gainsville, Florida
We are having the same issue in our gst and it ended up being the trans shifting on the block causing a alignment issue under high rpm and torque... bad and worn bolt holes and alignment pens. Broke 2 act disc and stripped 1 out
 

donniekak

DSM Wiseman
5,629
981
Mar 23, 2008
Surprise, Arizona
Not trying to thread jack, but why/what causes this to happen? I remember this happened when I was running my Excedy Twin Clutch. Was a shame too cause it had so much meat left. Excedy no longer makes the Twin for DSM's anymore.

This seems to be the failure point of all the unsprung disks. You can usually hear them rattle at idle before they fail completely.
 

BigBeans

Proven Member
1,423
27
Aug 16, 2009
I am in, Rhode_Island
Bnasty,

It seems like there's something off with the car or your installation techniques. This is the second clutch hub to fail in what, a few thousand miles? Both clutches were reputable brands and quality parts, so something isn't adding up.
 

bNasty

Proven Member
669
3
Jan 15, 2009
Chantilly, Virginia
Bnasty,

It seems like there's something off with the car or your installation techniques. This is the second clutch hub to fail in what, a few thousand miles? Both clutches were reputable brands and quality parts, so something isn't adding up.

I agree I feel like something is off but I dont know what I mean this isnt like my first install either. On my GST I installed the clutch and had no issues for over 20k miles. Im really puzzled all my alignment pins are in correctly and everything.

Probably a bad batch or the result of a prior mis-shift, or during installation the transmission was putting weight on the clutch disk hub and you bent the hub.

The failure rate on SBC's clutches are crazy low in comparison with their competitors.

The SSX clutch setups use the better EXEDY racing disk hub that has the springs and isolator bushings.


Who is BNasty? Is this one of my customers? Either way, contact SBC or the vendor you purchased from and get it replaced under warranty.

I am one of your customers I sent you these same pics in my email to you yesterday and Ive been in contact with you over the phone. (TMZ performance correct?)
 

twicks69

Supporting Vendor
4,104
1,410
Mar 12, 2004
Milwaukee, Wisconsin
Gotcha. Ben. Yup, that's me!

I just like keeping track of user names with real names.

We'll take care of this dude, no problems. As for turnaround, it should go fairly fast. I will likely have you talk directly to Jon at SBC before shipping it out. We'll talk Monday morning.

Tim Zimmer via Evo Phone
 
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