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Well, OK, the reduction in braking would be
Posted by Noel [Email] (more from Noel) on Thu, 4 Jan 2007 06:39:22
In Reply to: Cross-drilling does not reduce braking effectiveness..., MI-Roger 
[Profile/Gallery]
, Wed, 3 Jan 2007 14:50:22
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minimal, but all slotted/drilled rotors do on the street is massage egos. Useful, though if you do track days. They may have a slight benefit in dissipating rainwater, but probably not measurable for normal driving. (note that BMW has a system that automatically and cyclically applies the brakes ever so slightly in heavy rain to keep the rotors drier).
The biggest difference in braking performance comes with larger rotors and calipers because swept area--the area of rotor against which the pad is applied under braking is increased. This in turn generates a greater coefficient of friction.
If this area of friction makes no difference (as you claim) then why are bigger rotors, calipers and pads used on race cars, airplanes, and even bicycles? It is the combination of force (pistons pushing on the pads) *and* friction (swept area of the pad on the rotor) that slow the wheel.
The extra force means more heat, so big rotors are usually cross-drilled and/or slotted to aid heat dissipation and outgassing.
And we are missing the final component, tires, which also have a big impact on how well a car stops.
Posts in this Thread:
- rotors... Does it matter what kind I use?, Hoffa, Wed, 3 Jan 2007 08:56:43
- Be cheap, dtech, Wed, 3 Jan 2007 11:47:50
- Yes!, Noel, Wed, 3 Jan 2007 11:18:39
- trade offs, bobc
, Wed, 3 Jan 2007 11:12:27 - Re: rotors... Does it matter what kind I use?, wooglin
, Wed, 3 Jan 2007 10:56:22 - Re: rotors... Does it matter what kind I use?, paul o., Wed, 3 Jan 2007 09:14:47
- Stick with a name brand for a good reason...., MI-Roger , Wed, 3 Jan 2007 09:11:07
- They stop the car. Don't bargain hunt too hard., BrianG, Wed, 3 Jan 2007 09:07:58
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