SM CambioCorsa Clutch UPDATE

voicey

Member
Messages
660
I'll be very interested in how you get on with a kevlar clutch in the CC system. Good on you guys for getting together an making things better for yourselves!
 

maverick

Member
Messages
1,982
Ok guys if you need a lab rat for testing iam happy to donate my car as the clutch is due to fail any time soon ,along as a huge discount can be obtained , and I meen huge as in almost free ;-)
 

Aredes

Junior Member
Messages
159
Thats what we all should feel but these blessed spring tang failures seem to go any when from 8k miles and onwards.

Hope it lasts a bit longer than that....
 

conaero

Forum Owner
Messages
34,639
After taking some more advise I think we will be steering away from the kevlar system. It does work but setup is critical and we don't want to cause any more issues that we have to.

The organic plate is good for 50k miles so that will suffice for most on here I feel.

As for the spring tang failure, we have taken some more advice on this from an expert and it has come to light that it may be a sticking bearing that is causing the issues so to irradicate it, we need to look at this and the shaft it slides on further.

The Hills Engineering bearing also stuffers from the same issue.
 

CraigWaterman11

Sponsor
Messages
762
Conaero, this is an interesting update. Do you have any details on the slave cylinder/Thrust bearing shaft that would be causing it to stick? I just put mine together, and still have the entire set up in the other room until I take the clutch and pressure plate over to get it balanced. I'm using the Hill Engineering TB. While putting it together it seems the TB shaft was very well engineered and very smooth to facilitate sliding when the Hydraulic oil is pressurized there. Another forum member here I think has an SD tool or something similar that runs codes and he seemed to think that if the TB got stuck it would send a fault code and store it if that happened. Do you have any data with collapsed pressure plates that this code has been stored in any of those situations? I mean I get what the forum member was stating because the F1 sensor is literally attached to the TB, when thrust bearing moves the rod magnet moves in the sensor's base. If it got stuck, it does seem that sensor would be in the best position to know it.
On a side note I'm just asking questions to further the research not that I know all the answers. Sometimes it helps people are bouncing things off of you. Now I have to admit I want to ask how a stuck TB would cause a PP to fail? If it's sliding on it's base, and it has catch pins so that thrust bearing can not over extend. If a PP is built correctly, the PP is built to be consistently pushed in the area that the TB contacts, and spring back. So even it was pushed open longer from sticking would it effect it?

Maybe alternatively, now that I wrote the above, I could see maybe one circumstance that it could collapse it. If the bearing got stuck at the base of the TB shaft, or a small distance away from the PP enough times, it might continue to pressurize the slave cylinder until it slams the PP with a significantly harder force. That's a guess though, I'm not sure how much pressure it would have to build to throw it into the PP to collapse one of the tangs. As well the TB is designed not to contact any one of the tangs but all of them at the same time, you can see this in the photos below, in which case they all take the slam as a unit and only the weakest link breaks. The shaft the TB rides on will not allow it to hit the PP side-wards or off-set so as to contact only one piece of the PP:



IMAG1748.jpg


IMAG1832.jpg

Here's the TB shaft you were speaking about to the right of this photo:

IMAG1826.jpg
 

boomerang

Member
Messages
412
Very nice topic this one.( as so many are at this great forum!)

Quoting Craig; "when thrust bearing moves the rod magnet moves in the sensor's base. If it got stuck, it does seem that sensor would be in the best position to know it."

Agree.
The system wil through an error as soon as parts get out of normal limits or get stuck.
A TB that does not slide back enough, after releasing the clutch, would bring up faults.
From what i heard from a specialist, "normal wear'' (metal fatigue) does occur at the fingers of these pressureplates now and then.
Most cars that had these problems, showed the error light before, he sayd.
Hope this helps.

@ Craig;
would you please feed back the results of balancing the flywheel/clutch?
I am very interested to hear/see how much weight had to be equalized and wich amount of vibration (mm/sec) is achieved in the end.
Will you get a document mentioning the balancing results?
 

CraigWaterman11

Sponsor
Messages
762
Absolutely, I am dropping it off today. I will post the results. What I am specifically going to ask them to do is balance it just as the service manual states to do so on the car. Basically the two marks 180 degrees off from each other. In this fashion we will see what would happen if someone just put it on the vehicle with the marks opposing each other without it being balanced.