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Old 01-04-2003, 06:34 AM
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Post Redrill or slot rotors

I have a set of factory 9 inch disk brakes. I am using a GM bolt pattern. I am wondering if there is any problems with breakage on redrilled rotors. I have thought about having them slotted. What do you all think?

Chris

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Old 01-04-2003, 10:14 AM
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The only thing slots and holes get you is better rain performance, stick to a vented rotor and run air to it's ID...works way better and the rotors won't crack.

If you want it for looks then do the slots...less problems with cracking.
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Old 01-04-2003, 10:16 AM
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Whoops! Looks like I misread your post there Turbo? Are you talking about the bolt pattern?

If so then redrill, I have never had a problem with cracking when they have been redrilled.
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Old 01-04-2003, 01:04 PM
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Yep, bolt pattern it is. I have heard that Mosier will do it pretty cheap. Anyone used them or anyone else for that matter? Any local machine shop could do it, but they get paid by the hour, and they could not tell me how long it would take. If I had access to an index wheel and a mill, I would drill them myself.

chris
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Old 01-04-2003, 07:30 PM
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I have done it with nothing more than a compass and scriber, not difficult at all once you sit down and do the trig. The holes are oversize anyway so a few thou here or there is not the end of the world, the center hub locating hole is the important one.

When you do the trig just remember that a pentagon is nothing more than a couple triangles put together.
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Old 01-05-2003, 06:37 AM
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Good point, the axles are moseir with the ford center and chevy bolt pattern so the center will be dead on. I suppose I could use them to measure with and make a pattern. Oh yea, that would work. I can make a 1/4 steel pattern that fits and then use a transfer punch on the rotors and just drill them myself.

Thanks for making me think this thing through. Why pay someone to do that when I have already done everything else...

Chris
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