Good info the, heavy oh sh@t braking is what i worry about the most. Oh sh@t that pot hole just swallowed the car in front of me. The joys of driving in New EnglandMy statement regarding warpage was due to removing mass from the rotor in the slots and concentrating heat in the rotor in the mass remaining.
The slots, in theory, help keep the brake free of debris and "wipe" the rotor face, but in my opinion that doesn't offset the reduction in mass which is more critical to heat reduction during heavy braking.
IMHO, with *most* average passenger car rotors running normal street pads, slots/drilled holes are no improvement at all.
I had heard and been under the impression that the idea behind slots/ holes in rotors from an engineering standpoint was to allow an escape route for gasses produced from the pads under extreme heat conditions.. Not to "clean" the face. From what I understood, this gas could actually prevent contact and cause fade, if not given somewhere to go, hence the drilled and slotted design..??My statement regarding warpage was due to removing mass from the rotor in the slots and concentrating heat in the rotor in the mass remaining.
The slots, in theory, help keep the brake free of debris and "wipe" the rotor face, but in my opinion that doesn't offset the reduction in mass which is more critical to heat reduction during heavy braking.
IMHO, with *most* average passenger car rotors running normal street pads, slots/drilled holes are no improvement at all.
And they cost a lot more. I am trying to keep costs down because I am living on borrowed time with the transmission. I need to focus on saving money for a tremecFor 99.999% of cars on the road, slotted/drilled rotors offer zero benefit IMO.
I had heard and been under the impression that the idea behind slots/ holes in rotors from an engineering standpoint was to allow an escape route for gasses produced from the pads under extreme heat conditions.. Not to "clean" the face. From what I understood, this gas could actually prevent contact and cause fade, if not given somewhere to go, hence the drilled and slotted design..??
Not trying to be contrary, that's tech info I picked up twenty years ago.. Thoughts?
You are absolutely right....
But modern pads don't suffer from this as much as pads did 20-30 years ago.
Good report that came out in 2006 called "The Effect of Rotor Crossdrilling on Brake Performance" written by two GM engineers. It's an SAE paper so unfortunately tou need to pay to read it
http://papers.sae.org/2006-01-0691/
But if you search around for the title you'll find it discussed in several forums. Here's a good one discussing it
http://forum.e46fanatics.com/showthread.php?t=500950
I still maintain my stance that for your average, normal street driven car that may see occasional aggressive driving, a X-drilled rotor is merely for show and you'd be better off with solid rotors
I still maintain my stance that for your average, normal street driven car that may see occasional aggressive driving, a X-drilled rotor is merely for show and you'd be better off with solid rotors
^ this guy is wise. I'm gonna start calling him OBDI Kanobe (get it obdI...)Technically, they should be cast with the holes already in place. It should not be a secondary process
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