Slotted to edge vs slotted vs cross drilled ... what is better for street use
05-31-2005, 09:27 AM
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Slotted to edge vs slotted vs cross drilled ... what is better for street use
I read something the other day that said slotted but not to edge was better as it let the gases escape but also allowed the pad to heat up more for better grip.
I also noticed the stasis upgrades are slotted and not to the edge ?
Whats the consensus ? I need replacement rotors for my TT and I am looking for performance not style.
I also noticed the stasis upgrades are slotted and not to the edge ?
Whats the consensus ? I need replacement rotors for my TT and I am looking for performance not style.
05-31-2005, 10:09 AM
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For street use, it doesn't make much difference.
The rotor is less susceptible to cracking if the slots don't go to the edge. A slot to the edge provides a point of high stress where a crack could initiate.
Both slotted and cross-driled rotors will help to reduce pad glazing, but allowing gases to escape is not an issue. In the "old days", pads could give off gases when they were hot, but this just doesn't happen with modern pads after the initial bedding.
Personally, I'm not a fan of cross-drilled holes on any rotor that will see severe service. Sooner or later, cracks will initiate at the holes. Also, the holes allow brake dust to coat the rotor internals and reduce heat transfer, which is about the last thing you need.
These are RS4 rotor pics,
<img src="http://mishami.image.pbase.com/u34/nogaroblue/large/41363434.RS4rotors1.jpg">
<img src="http://mk31.image.pbase.com/u34/nogaroblue/large/41363439.RS4rotors2.jpg">
Both slotted and cross-driled rotors will help to reduce pad glazing, but allowing gases to escape is not an issue. In the "old days", pads could give off gases when they were hot, but this just doesn't happen with modern pads after the initial bedding.
Personally, I'm not a fan of cross-drilled holes on any rotor that will see severe service. Sooner or later, cracks will initiate at the holes. Also, the holes allow brake dust to coat the rotor internals and reduce heat transfer, which is about the last thing you need.
These are RS4 rotor pics,
<img src="http://mishami.image.pbase.com/u34/nogaroblue/large/41363434.RS4rotors1.jpg">
<img src="http://mk31.image.pbase.com/u34/nogaroblue/large/41363439.RS4rotors2.jpg">
05-31-2005, 11:07 AM
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Looks like a very bad idea, ...
... except for bling, the worst of everything! The slots go to the edge of the rotor plus the disadvantages of holes.
I don't know why you can't see the pics, but try <a href="http://www.pbase.com/nogaroblue/032805&page=2">This Link</a> to an album with the RS4 pics. Can you see the slotted rotor pic in my other post?
I don't know why you can't see the pics, but try <a href="http://www.pbase.com/nogaroblue/032805&page=2">This Link</a> to an album with the RS4 pics. Can you see the slotted rotor pic in my other post?
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06-03-2005, 06:12 AM
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Cross-drilling to the max for weight reduction :-)
Those are the rotors from our Formula Continental. I've forgotten how much weight this saved, but it was significant. Even though the holes in this solid rotor are well chamfered, the disc needs to be replaced after ~30 race weekends because of cracks initiating at the holes.
<img src="http://pws.prserv.net/usinet.Young/photos/chicagoautoshow.jpg">
<img src="http://pws.prserv.net/usinet.Young/photos/chicagoautoshow.jpg">
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