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TR Clutch Lifespan - How many miles?

Discussion in 'Boxers/TR/M' started by vincenzo, Feb 27, 2020.

  1. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    2,763
    Currently at 18.7k miles and the clutch pedal is releasing at the top of travel. Have not felt any slippage, but I suspect the time is near.

    Any ideas what the ‘typical’ clutch mileage is on these cars? Never had a clutch expire so soon before.
     
  2. Steve Magnusson

    Steve Magnusson F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    19,079
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    Steve Magnusson
    I'm at 85K miles. I think "how used" is going to be a huge factor in causing a wide spread of results.
     
  3. V4NG0

    V4NG0 Karting
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    Dec 14, 2018
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    Vinny
    Mine has over 20k on it and still feels strong.

    Related question— can the clutch be replaced with the engine in?
     
  4. Rifledriver

    Rifledriver Two Time F1 World Champ

    Apr 29, 2004
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    Brian Crall
    #4 Rifledriver, Feb 27, 2020
    Last edited: Feb 27, 2020
    I have seen several go over 100,000. Up to you. I wear cars out around clutches. When I rebuilt my 328 motor I put the old clutch back in.

    As you probably know it is a dual disc clutch. The clutch pack has shims to establish the correct clamping pressure.It can be reshimmed to compensate for wear and get much more life out of it. The pedal goes way up and it loses clamping pressure and slips even though there is a good deal of disc material left. If you get there before it starts slipping and destroys the discs it can be reshimmed. There is even a formula in the shop manual. When I do them I tend to just adjust the shims so the fingers of the diaphragm spring are slightly convex for good geometry. If it is adjusted too flat the spring goes over center and at high RPM shift with the centrifugal force on the clutch spring it will not re engage. The shims are 8mm ID so various thickness washers can serve as shims or sometimes it needs no shims depending on wear of the discs.

    If you have Ben do it he and I have known each other a long time. I'll be happy to to talk to him about it.
     
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  5. Rifledriver

    Rifledriver Two Time F1 World Champ

    Apr 29, 2004
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    Very easily should you need to.
     
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  6. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
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    romano schwabel
    yes, without any problem. one of the easier jobs on a TR
     
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  7. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    2,763
    Thanks Brian... I already have a clutch kit that I have literally had for years. When I pull it apart and inspect, I may very well ask for help on shimming. Thanks!

    All those high mile clutches! Any other issues that cause engagement at the top of the pedal? Like I say, it does not slip... but it engages so high it is surprising to me that it doesn’t slip.

    Vinny - I found this on an F-Chat search... nice pdf... not mine:
    https://www.docdroid.net/file/download/o6XkKqv/ferrari-testarossa-1987.pdf
     
  8. Rifledriver

    Rifledriver Two Time F1 World Champ

    Apr 29, 2004
    26,949
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    Brian Crall
    #8 Rifledriver, Feb 27, 2020
    Last edited: Feb 27, 2020
    No. TR clutches were a problem. They lack any feel. It isn't uncommon to hear one moving off and hear the RPM go up rather quickly then the driver lets the clutch out to accelerate the car to the engine speed. It is hard not to do. Me, I hate buying clutches and am not afraid to maybe be a little too abrupt in letting it out. I tell people new to TR's to not use it subconsciously even if you have driven a stick your whole life. Make it a conscious operation, pay attention to it. Unless on a hill I don't even use throttle until the clutch is all or mostly out.

    In my opinion one of the biggest improvements in the 512TR was the clutch. It had a big single plate clutch and had terrific feel. It is also a lot cheaper. I am pretty sure Hill Engineering is making a conversion kit to put them in TR's.
     
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  9. V4NG0

    V4NG0 Karting
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    Dec 14, 2018
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    Vinny
    Thanks guys for confirming. I had an issue a while back that I thought was clutch related, but turned out not to be. The point is, I read somewhere during troubleshooting research that the engine came out for clutch replacement. I’m glad to know from good authority that it is not the case!
     
  10. xplodee

    xplodee Formula Junior
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    Jan 3, 2017
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    Tim
    That Hill Engineering single plate clutch kit looks AWESOME! Makes me not even care when my clutch will eventually go out, it will become a major upgrade.
     
  11. ozziindaus

    ozziindaus F1 Veteran
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    Aug 16, 2012
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    Sam
    I had to change mine at <10,000 miles. One plate was perfect, the other worn down to the rivers. It sat around for years which I’m sure contributed to the problem. Theory is that will little use, the spline gets rusty/sticky and does not enable both plates to wear evenly. IDK.
     
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  12. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    2,763
    #13 vincenzo, Mar 1, 2020
    Last edited: Mar 1, 2020

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