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Weird Clutch Wear with Findanza/South Bend/ACT 2600 Combo

Posted by High PSI, Jul 30, 2019

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  1. High PSI

    High PSI Proven Member

    96
    1
    Joined Oct 21, 2004
    USA, Australia
    Combo:
    - ACT 2600 Pressure Plate (about 25,000 Miles)
    - Fidanza Aluminum Flywheel (About 5,000 Miles)
    - South Bend TZ/FE-Series Custom Clutch Disk (Full Face Kevlar/Feramic Clutch Disk) - "Stage 3 Endurance" (About 5,000 Miles)

    I purchased the clutch disk and findanza aluminum flywheel about 5,000 miles ago to use with an existing ACT 2600 PP that I had . The engine spun a bearing so I'm replacing the shorblock and of course pulled the clutch for inspection while I was at it. I was surprised to find the clutch and flywheel had some odd, uneven wear on the surface and I'm trying to determine the cause. I also noticed some hot-spots on the ACT 2600 PP. The car has been used for daily driving and long road-trips almost exclusively, with only one or two street launches for data logging purposes. I.e., not abused.

    I am just looking for advice as to whether or not any of these pieces are still usable and also what the potential cause of this uneven wear might be. It looks to me like the uneven wear is caused by the Findanza flywheel, so I'm hesitant to just buy a new Fidanza friction disk, South Bend clutch disk, and re-install.
     

    Attached Files:

  2. motomattx

    motomattx Proven Member

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    Joined Dec 9, 2010
    wampum, Pennsylvania
    It looks like it wasn't making full contact on the flywheel and likely was slipping some because of that, I would re-use everything other than that pressure plate, as to why it wasn't making contact it could be because it wasn't bedded in yet or just incompatibility issues with the pressure plate and flywheel leaving the wrong clearances for the disk.
     

    Drag Race Build 2K  16

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  3. bastarddsm

    bastarddsm Proven Member

    4,398
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    Joined Aug 26, 2003
    Mendota, Illinois
    I'll take the pp off your hands if you replace it. But anyway check the PP for warp with a straight edge. I don't think that wear looks all that unusual.
     

    Showcar Build 5K  1

    1991 Eagle Talon N/T
    9.805 @ 144.00 · 1G DSM
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  4. High PSI

    High PSI Proven Member

    96
    1
    Joined Oct 21, 2004
    USA, Australia
    I never felt it slip, athough the car was only running a maxed-out ported 14B (33lb/min). I was actually least concerned about the pressure plate as that side of the clutch disk looks to have worn pretty evenly with a slight gradiant in color change from the inside out. It's the flywheel side that has obvious "rings" of wear at the clutch disk rivets and at the outer edge. I don't see how the pressure plate could affect this?
     
  5. High PSI

    High PSI Proven Member

    96
    1
    Joined Oct 21, 2004
    USA, Australia
    As said to motomattx above, it's the uneven wear on the flywheel side that concerns me. Maybe I'm reading into it too much, but if I had brake rotors that looked like that I'd be thinking there was something very wrong.

    I'll check with the straight-edge. I've also E-mailed South Bend and will report back with their thoughts.
     
  6. tk106

    tk106 Supporting Member

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    Cincinnati, Ohio
    Have you checked the pivot ball and clutch fork?
     

    115  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    119  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

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    1992 Eagle Talon TSi AWD
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  7. High PSI

    High PSI Proven Member

    96
    1
    Joined Oct 21, 2004
    USA, Australia
    Have not, though I think that would only effect engagement/dis-engagement and don't understand how that could case uneven wear across the surface of the clutch disk and/or flywheel?
     
  8. tk106

    tk106 Supporting Member

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    Cincinnati, Ohio
    Oh yeah. My bad. You’re completely right.
     

    115  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    119  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 2K  6

    1992 Eagle Talon TSi AWD
    12.625 @ 111.42 · 1G DSM
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  9. DSMPT

    DSMPT Proven Member

    490
    168
    Joined Jun 12, 2014
    Japan / Mexico, Arizona
    Seems the finger spring were contacting to the clutch disc.
    You should re-check the height and the adjustment. Didn't you shim too much or use an extension rod?

    IMG_2539.jpg
     

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  10. High PSI

    High PSI Proven Member

    96
    1
    Joined Oct 21, 2004
    USA, Australia
    It was a good 6 and a half years ago when I installed the clutch, but I don't recall having to "shim" anything. As the flywheel and clutch were both brand new I assumed that the step would be to spec as installed.

    What do you mean by an extension rod?
     
  11. DSMPT

    DSMPT Proven Member

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    Japan / Mexico, Arizona
    The extension rod is a longer clutch slave cylinder rod. It is a band aid to temporary fix clutch dragging/engagement issue but it would cause more troubles.
     

    Drag Race Build 1K  2

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    Street Build 1K  4

    1998 Mitsubishi Eclipse GSX
    awd · automatic · 2G DSM
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  12. pauleyman

    pauleyman DSM Wiseman

    5,120
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    oklahoma city, Oklahoma
    Assumed...yup. you must always measure. Even new parts.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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    Mello likes this.
  13. pauleyman

    pauleyman DSM Wiseman

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    oklahoma city, Oklahoma

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  14. High PSI

    High PSI Proven Member

    96
    1
    Joined Oct 21, 2004
    USA, Australia
    Thanks very much for that. Lots of good info there. In the interim I also came across this:
    http://www.roadraceengineering.com/clutchandflywheeltech.htm

    To be honest, a lot more to the clutch than I originally thought. Done many clutch jobs before but on all of my other cars I've used PPs and clutch disks from the same manufacturer, and a flat flywheel...so this stepped flywheel + friction plate + PP and Disk being from two different manufacturers really throws a wrench in things.

    I'll measure the step tomorrow. I'll also contact South Bend and ACT for their suggested steps, as well as see if either of them will comment on their compatability (or lack thereof).

    I also came across this in my research:
    https://www.dsmtuners.com/threads/having-tranny-issues-at-high-rpm-5-speed.381461/

    At the bottom of the page is this comment:
    "What clutch are you running? If it is a ACT clutch they recommend a shim under the pivot ball to give you a little extra release. Not sure how thick , but ive heard at least the thickness of arp head stud washer."

    Has anyone else come across this? This is the first I've heard...though in your own thread that you linked to above, "GST with PSI" says:
    "90% of ACT clutch setups will shift like sh** (or not at all) at or near redline for the reasons Paul mentioned above. The 10% that do shift fine are the result of luck, or extensive modification to the clutch system. There's no easy way around it."
     
  15. twicks69

    twicks69 Supporting Vendor

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    Milwaukee, Wisconsin
    You are using an incompatible pressure plate with that disk is what it is appearing to me from the wear on the underside of the pressure plate diaphragm springs.

    Measure the flywheel friction surface for flatness.
     

    Drag Race Build 7K  12  76

    1999 Mitsubishi Eclipse GSX
    9.499 @ 155.00 · 2G DSM
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