Rotors: slotted vs. drilled vs. slotted and drilled
#16
This information from RacingBrake is pretty insightful. They have a patent on 2-piece rotors that are uniquely slotted and drilled in one shot. I'm running these rotors with their ET500 street pad. The more they heat up, the more ferociously they bite. It's almost like having two brake pad profiles in one. For normal braking, you'd never know they're not stock. However, if you apply the brakes for a few seconds and then get back on them in an aggressive braking situation, they scrub speed in a hurry. Mine only squeak just slightly when I'm at very low speed (i.e. letting off the brakes as you go through the bank drive through).
Technology - RacingBrake.com
They cover the advantages of the slotting/drilling in one step here:
Disc Surface Finish - RacingBrake.com
Advantages:
-Has the advantages of both drilled & slotted rotors
-Allows the disc to expand and contract and prevents the disc from cracking or warping
-Increasing cooling area and retains more friction surface
-Slots relieves thermal stress
-Slots are self cleaning and the pad build up will not clog the slots and are exhausted via the rotor edge keeping the disc surface clean
-Reduces brake pad dust buildup and keeps the wheel clean through vacuum effect
Technology - RacingBrake.com
They cover the advantages of the slotting/drilling in one step here:
Disc Surface Finish - RacingBrake.com
Advantages:
-Has the advantages of both drilled & slotted rotors
-Allows the disc to expand and contract and prevents the disc from cracking or warping
-Increasing cooling area and retains more friction surface
-Slots relieves thermal stress
-Slots are self cleaning and the pad build up will not clog the slots and are exhausted via the rotor edge keeping the disc surface clean
-Reduces brake pad dust buildup and keeps the wheel clean through vacuum effect
#19
#20
yes i bought new pads when i installed the rotors i think im going to be getting semi quiet pads on my next brake pad change although there noisy but the stopping power is awesome.
#23
#24
blanks>slotted>slotted and drilled
Why people want to take mass away from the rotor, which serves the purpose of a heat sink for the friction created by the pads, is beyond me
Why people want to take mass away from the rotor, which serves the purpose of a heat sink for the friction created by the pads, is beyond me
#25
There are plenty of reasons. Why do radiators have fins? More surface area dissipates heat better.
The interruption in brake surface helps reduce fade by moving gas/heat/air away from the surface of the rotor. The benefit of slotted over drilled is that slotted rotors do not create a trench all the way through the rotor. Drilled rotors have holes all the way through and are weaker because of it.
Slots reduce mass, which can help with acceleration, rotors are more than just a heat sink, eventually that heat has to go somewhere, and increased surface area helps that.
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Bravo at (05-27-2014)
#26
Thread Starter
A quarter past stripped
Joined: Nov 2013
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From: Pembroke Pines, Florida
There are plenty of reasons. Why do radiators have fins? More surface area dissipates heat better.
The interruption in brake surface helps reduce fade by moving gas/heat/air away from the surface of the rotor. The benefit of slotted over drilled is that slotted rotors do not create a trench all the way through the rotor. Drilled rotors have holes all the way through and are weaker because of it.
Slots reduce mass, which can help with acceleration, rotors are more than just a heat sink, eventually that heat has to go somewhere, and increased surface area helps that.
The interruption in brake surface helps reduce fade by moving gas/heat/air away from the surface of the rotor. The benefit of slotted over drilled is that slotted rotors do not create a trench all the way through the rotor. Drilled rotors have holes all the way through and are weaker because of it.
Slots reduce mass, which can help with acceleration, rotors are more than just a heat sink, eventually that heat has to go somewhere, and increased surface area helps that.
#27
Drilling a bunch of holes in the rotor means that for the same surface size, there is less surface to create that friction to slow you down.
The front rotors are already vented to let heat escape. Pads haven't generated gas that needs released in a long time.
Seriously? Slots help with acceleration? You're talking about a pound or three or four.
Again, think about what your brakes do:
1--pads create friction and slow you down. The more rotor, the more contact, the faster you slow down.
2--heat dissapates. The more rotor (ie not drilled) the more mass to absorb the heat
3--rotors cool. It could be argued that drilled rotors help here, but I don't think enough to offset the inherent weakness in drilling, or the compromise to the 1st and 2nd functions of the rotor. You would be better off running some sort of brake cooling ducts.
If you absolutely must have dressed up rotors, slotted are less of a compromise than drilled and slotted.
#28
That's why I have slotted only rotors. There is a definite benefit to buying slotted vs OEM blanks. It's possible that blanks will slow you down faster, but slotted will stand up to repeated braking far better than blanks.
#29
#30