 Check your rotors |
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| scotty b |
 Apr 4 2013, 06:06 PM
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#1
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rust free you say ?  Group: Members Posts: 16,375 Joined: 7-January 05 From: richmond, Va. Member No.: 3,419 Region Association: None  |
RS America came in for some track damage. The owner had some brake issues. I can't imagine why (IMG:style_emoticons/default/blink.gif) I've seen this many times before, but never this bad. EVERY hole has split
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| worn |
Apr 4 2013, 06:11 PM
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Winner of the Utah Twisted Joint Award Group: Members Posts: 3,492 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest 
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QUOTE(scotty b @ Apr 4 2013, 04:06 PM)  RS America came in for some track damage. The owner had some brake issues. I can't imagine why (IMG:style_emoticons/default/blink.gif) I've seen this many times before, but never this bad. EVERY hole has split Sort of reminds me of the many articles by engineers telling you not to drill through rotors. Or buy them drilled. That is one messed up disc. |
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| Cupomeat |
Apr 4 2013, 06:28 PM
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#3
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missing my NY 914 in VA Group: Members Posts: 1,338 Joined: 26-November 07 From: Oakton VA Member No.: 8,376 Region Association: MidAtlantic Region |
Yes, this is pretty typical for a tracked car.
The PCA rules for inspecting rotors state that no cracks can extend to the outside edge. I seem to remember it stating that a crack can't extend to another hole either, but can't find that now. Agreed on the drilling part, which is why I pay extra ($20) for the Porsche OEM rotors on my 993 as they cast the holes into the rotor as opposed to Zimmerman who drills them. These cracks are pretty serious, I'd probably replace this disk. |
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| Bartlett 914 |
Apr 4 2013, 06:46 PM
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#4
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Advanced Member Group: Members Posts: 2,218 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
Probably stress cracks from using a drill that is not sharp enough and drilling too fast in either drill speed and or feed. I would also use coolant when doing this operation.
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| Eric_Shea |
Apr 6 2013, 07:08 AM
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#5
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PMB Performance Group: Admin Posts: 19,304 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
That rotor got very very hot.
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| sixnotfour |
Apr 6 2013, 07:20 AM
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#6
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914 Wizard Group: Members Posts: 10,917 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains
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Aside from the cracks, That rotor is wore out regardless....
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| ConeDodger |
Apr 6 2013, 07:48 AM
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#7
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Apex killer! Group: Members Posts: 24,118 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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I doubt that drilled rotors are the issue. Yes, that happens but this guy needs to pay attention to his brakes. Like Eric and Jeff said, those rotors are worn out. I don't think it happened in one track event either. If you're going to track your car, you need to (as Scotty said) check your rotors and pads frequently. Bleed your brakes pretty much between every event. While autocrossing is hard on tires and pretty much not hard on anything else, track events really work the brakes (and the tires but less so...)
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| messix |
Apr 6 2013, 12:37 PM
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#8
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AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
nothing beats mass and air flow! (IMG:style_emoticons/default/shades.gif)
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