Zimmermann drilled rotors, who had problems with them........?
11-05-2002, 11:10 AM
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Zimmermann drilled rotors, who had problems with them........?
After approx. 500 mls all 4 rotors cracked! I run with Mintex reds, proper bedding, proper wheeltorque etc etc, all according to the "book".
I understand that these rotors are not drilled but that the holes are cast. So what's going on here? Anybody else?
I understand that these rotors are not drilled but that the holes are cast. So what's going on here? Anybody else?
11-05-2002, 11:39 AM
#3
Re: Zimmermann drilled rotors, who had problems with them........?
Who told you the holes were cast? The salesman, or Zimmermann?
I'd start doing some checking, starting with the place you bought the rotors from.
Yet another reason to not buy x-drilled rotors...
I'd start doing some checking, starting with the place you bought the rotors from.
Yet another reason to not buy x-drilled rotors...
11-06-2002, 07:20 AM
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Pics of cracked rotors, hope it works...pic 1
<center><img src="http://www.imagestation.com/picture/sraid38/p81e1fd267b131d373dca111beae81dbc/fd1321f2.jpg"></center><p>I thought the holes are cast, maybe I'm wrong??
Still no answer from the people I bought the rotors from.
Still no answer from the people I bought the rotors from.
11-06-2002, 07:21 AM
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Re: Pics of cracked rotors, hope it works...pic 2
<center><img src="http://www.imagestation.com/picture/sraid38/p32b744c847535392ee603ae0abd92c35/fd1321d6.jpg"></center><p>
11-06-2002, 07:22 AM
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Re: Pics of cracked rotors, hope it works...pic 3
<center><img src="http://www.imagestation.com/picture/sraid38/p8afe1c3c106c82d6f69933a6e09b2ddf/fd1321c9.jpg"></center><p>
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11-06-2002, 03:46 PM
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Re: pic 3 ...
.
Unless it's the lighting, it looks like the 2nd hole on the outer circumference is not chamfered.
Chamfering is absolutely necessary to prevent areas of high localized stress where cracks would initiate. On a rotor with cast holes, I'd assume that the all the beveled edges would be "cast in". This hole looks like it was drilled and then someone forgot to take out that sharp edge.
Worse yet, even if the holes are drilled and chamfered, it would be almost impossible to chamfer the inside (vane side) of each hole.
Unless it's the lighting, it looks like the 2nd hole on the outer circumference is not chamfered.
Chamfering is absolutely necessary to prevent areas of high localized stress where cracks would initiate. On a rotor with cast holes, I'd assume that the all the beveled edges would be "cast in". This hole looks like it was drilled and then someone forgot to take out that sharp edge.
Worse yet, even if the holes are drilled and chamfered, it would be almost impossible to chamfer the inside (vane side) of each hole.