rotor question
#17
Registered User
Yea to a great extent it's about looks, here's the benefits touted by Brakeperformance.com, I can see some heat management benefits not sure about the better braking, no difference noted so far but then I'm not tracking the car.
www.brakeperformance.com
Full Sweep Scraper Slots dissipate heat, increases bite and reduces the stopping distance. Our slots also help to de-glaze and even out brake pads while throwing dust and debris away from the wheels. It also sheds water under-wet driving conditions.
www.brakeperformance.com
Full Sweep Scraper Slots dissipate heat, increases bite and reduces the stopping distance. Our slots also help to de-glaze and even out brake pads while throwing dust and debris away from the wheels. It also sheds water under-wet driving conditions.
#19
and having less mass (ie slotted) does not help heat dissipation, since there will be less mass for the heat to transfer too. It's not like the slots act as fans for the brake pads. With the temperatures that the brakes and rotors reach, the only way to make air cool them effectively is to have air ducts into the rotor area.
IMO you have a higher chance of heat soak in a slotted rotor than a blank due to less mass alone
here is a good read that i read up on a while ago, back in my honda days (ya ya, i know - i went to a fds3, then to this, so i went up the ladder :P)
http://www.honda-tech.com/zerothread...ostid=35728678
#20
oh, and if you are too lazy to read that entire thread - best part is here
"Find me an F1 car as of now that uses cross drilled or slotted rotors.
They all use full ceramic rotors and ceramic pads. Are they drilled or slotted? No.
If they helped the fastest cars in the world, wouldn't they use them? Its basic calculations that show the lack in surface area does not make up for the possible loss in temperarure. They use brake cooling air ducts insted."
"Find me an F1 car as of now that uses cross drilled or slotted rotors.
They all use full ceramic rotors and ceramic pads. Are they drilled or slotted? No.
If they helped the fastest cars in the world, wouldn't they use them? Its basic calculations that show the lack in surface area does not make up for the possible loss in temperarure. They use brake cooling air ducts insted."
#21
#22
Registered User
oh, and if you are too lazy to read that entire thread - best part is here
"Find me an F1 car as of now that uses cross drilled or slotted rotors.
They all use full ceramic rotors and ceramic pads. Are they drilled or slotted? No.
If they helped the fastest cars in the world, wouldn't they use them? Its basic calculations that show the lack in surface area does not make up for the possible loss in temperarure. They use brake cooling air ducts insted."
"Find me an F1 car as of now that uses cross drilled or slotted rotors.
They all use full ceramic rotors and ceramic pads. Are they drilled or slotted? No.
If they helped the fastest cars in the world, wouldn't they use them? Its basic calculations that show the lack in surface area does not make up for the possible loss in temperarure. They use brake cooling air ducts insted."
#23
Even if it gets serviced after every race, how does that factor into it? Wouldn't you want the best stopping power for f1? Its not like having blanks makes the brake pads go faster. They would want to disapate heat as much as possible to be able to stop. Nascar problably doesn't use drilled/ slotted either. The mazda 787b doesn't use them either (from the pics i looked up on the internet)
They use slotted and drilled/ dimpled on performance street cars just for looks - nothing elese. Or why wouldn't all of these cars come with them from OEM? its less material, wouldn't it be cheaper cast that way? 2% material saved times millions of rotors = lots of money saved
They use slotted and drilled/ dimpled on performance street cars just for looks - nothing elese. Or why wouldn't all of these cars come with them from OEM? its less material, wouldn't it be cheaper cast that way? 2% material saved times millions of rotors = lots of money saved
The camparison of requirements between an F1 car and street car are not the same... an F1 car get's it's brake serviced after every race... a street car doesn't. If however you look at performance parts for street cars, a much closer match, you will find drilled and slotted rotors. Why would they do that if it wasn't a benefit? That benefit may just be looks, although common sense would lead you to beleive they do help with heat, deglazing, dust dirstribution and water which in the end should improve overall brake performance.
#24
Registered User
They use slotted and drilled/ dimpled on performance street cars just for looks - nothing elese. Or why wouldn't all of these cars come with them from OEM? its less material, wouldn't it be cheaper cast that way? 2% material saved times millions of rotors = lots of money saved
Last edited by RedG37SNC; 10-16-2008 at 12:25 AM.
#25
Registered Member
iTrader: (4)
well rollin, i will agree that people putting drilled or slotted rotor on street cars is purely for looks. i would guarantee that almost 100% percent of these people will never get into a situation that they will max out their braking performance. however, most endurance race cars use drilled or slotted rotors, and as red has said, there must be a reason why.
your idea that it would be cheaper to make rotors with holes in them is faulty. drilled rotors are not cast that way, they are forged, machined, and drilled. also, the smaller mass does heat up faster, but also disipates heat more quickly.
your idea that it would be cheaper to make rotors with holes in them is faulty. drilled rotors are not cast that way, they are forged, machined, and drilled. also, the smaller mass does heat up faster, but also disipates heat more quickly.
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