Why are rotors drilled or slotted?
03-13-2008, 07:56 AM
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Why are rotors drilled or slotted?
Just curious what the purpose is of cross-drilling or slotting rotors? I've heard theories about dissipating heat, gasses, water... Anyone here know the definitive answer? Some say it's just for looks.
03-13-2008, 09:54 AM
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03-13-2008, 10:15 AM
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Cross drilling allows premature cracking from hole to hole, causing one to empty his wallet at the parts counter after track weekends. LOL. FWIW, I've had better luck with slotted rotors.
03-13-2008, 04:29 PM
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it's all allegedly to help increase resistance to fade by keeping temps down with additional airflow... has side effects of lightening unsprung weight (good) and wallet (bad). also, it gives the brake dust somewhere to go.
plus- they do look cooler- which is undebatable.
plus- they do look cooler- which is undebatable.
03-13-2008, 07:42 PM
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it's all allegedly to help increase resistance to fade by keeping temps down with additional airflow... has side effects of lightening unsprung weight (good) and wallet (bad). also, it gives the brake dust somewhere to go.
plus- they do look cooler- which is undebatable.
plus- they do look cooler- which is undebatable.
03-13-2008, 09:47 PM
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09-28-2008, 01:29 PM
#10
FWIW it is my understanding that on OEM steel Porsche rotors the placement of the holes is part of the forging process and they are not drilled after the fact.
While having to replace rotors on such a regular basis is an expensive PITA,is their an engineering solution to this problem other then ceramics @ $6-8,000 a set?It would be hard to believe that after- market rotors that are actually cross drilled would be a better option.
It would also seem hard to believe that this is a Porsche only problem and that other high performance cars like the vettes,vipers,ferrari,etc don't have the same issue,especially those that are raced or tracked.
Tom B.
While having to replace rotors on such a regular basis is an expensive PITA,is their an engineering solution to this problem other then ceramics @ $6-8,000 a set?It would be hard to believe that after- market rotors that are actually cross drilled would be a better option.
It would also seem hard to believe that this is a Porsche only problem and that other high performance cars like the vettes,vipers,ferrari,etc don't have the same issue,especially those that are raced or tracked.
Tom B.
09-28-2008, 06:35 PM
#11
Have you seen the drilled rotors on the cups and such? They are humongous in width, my have the 3 piece cup rotors and they are just beastly, no cracks like the regular cups! Pricey though!
09-28-2008, 08:01 PM
#12
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correct: not drilled.
FWIW it is my understanding that on OEM steel Porsche rotors the placement of the holes is part of the forging process and they are not drilled after the fact.
While having to replace rotors on such a regular basis is an expensive PITA,is their an engineering solution to this problem other then ceramics @ $6-8,000 a set?It would be hard to believe that after- market rotors that are actually cross drilled would be a better option.
It would also seem hard to believe that this is a Porsche only problem and that other high performance cars like the vettes,vipers,ferrari,etc don't have the same issue,especially those that are raced or tracked.
Tom B.
While having to replace rotors on such a regular basis is an expensive PITA,is their an engineering solution to this problem other then ceramics @ $6-8,000 a set?It would be hard to believe that after- market rotors that are actually cross drilled would be a better option.
It would also seem hard to believe that this is a Porsche only problem and that other high performance cars like the vettes,vipers,ferrari,etc don't have the same issue,especially those that are raced or tracked.
Tom B.