Quote:
Originally posted by xlr8or
Don't do it. It's to crucial to balance and strength. If you want slotted and/or drilled just buy them that way.
Just my $.02
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If done accurately in the proper fixture ballance won't be affected.
Strength shouldn't be a problem either. The only problem with drilled discs I've heard of is the holes leading to cracks forming.
The reports of cracking I believe are only under extreme conditions i.e. V8 Supercar racing etc. I think it has something to do with the varying temperatures across the disc with more air/surface area around the holes meaning that section of the disk runs slightly cooler. The purpose of the holes isn't cooling but allowing the hot gasses greated by the pad rubbing against the disc to escape without pushing the pad away from the disc.
Porsche have been fitting their cars with drilled Brembo rotors for years. For a road car that gets occasional 5 lap sprint duty at the race track would this be enough abuse to cause cracking?
Drilling the discs is easy enough to do but time consuming Slotting them is relatively quick. I often wonder if brake manufactures are recomending slotting because it's less labour intesive for a CNC machine and they can churn them out quicker and cheaper?
Here's one of the disc off my car getting the drilling and slotting treatment. It's probably a bit much but I was looking for things to do while waiting for my kit to turn up.
