Pelican Parts Forums - Anyone using this brake kit?

Quote:

Originally posted by Bill Verburg
yes after the seals have failed they will corrode, but corrosion is not the only issue, physical abrasion from any dirt is an issue w/ any cyl.

The caliper is major contributor to heat dissipation only to the extent that the rotor temps have become too high. Yes, they do need to handle some heat but only a small % of the total thermal burden.
http://forums.pelicanparts.com/uploa...1101948801.gif

There are two important factors in the rotors ability to handle heat one is the mass the other is the internal structure. 2 externally identical 304x32mm 930 rotors can have very different internal structure, which of theses do you suppose will run cooler?
http://forums.pelicanparts.com/uploa...1101948942.jpg

The name of the game w/ brakes is to keep the temps down by whatever means you can.

Using big calipers on small rotors only makes the rotor run hotter and fail sooner That is why the Boxster brake used on Carrera rotors is not a brake upgrade.

The truth about the two rotors shown above about what rotor will run cooler is kinda a close call, I know right off the bat you are going to think the rotor on the right. I would agree with that because of the superior vain disign, and the larger thermal reseves, and I would stay its a great rotor "if it was not drilled". The rotor on the left (although of a cheeper disgn) has a advantage of being flat face. If you are having heat problems do not go with a drilled rotor, yes they look neat, but you are making the problem worse.(This is all assuming the rotors are made of the same matirial)

My quick explaination: Rotors are drilled to lighten them, not to cool them. Yes in some conditions they are also there to give water, and foreign objects a place to go instead of getting stuck between the pad, and the rotor.
.As in relation to cooling only!! >> a drilled rotor will run hotter and this is why. The drills remove inportant surface area needed in the transferance of friction in to heat. When the drilled space passes through the clamping caliper, the calipers force is constaint, and is producing a steady amount of friction/heat. The heat needs a place to go, but with the drill removing surface area, the same heat gets forced into a smaller surface area causing the areas directly around the holes to become a lot hotter then anywhere else on the rotor. This missing heatsink(rotor surface area) becomes a snowballing effect and the metal directly around the holes begins to expand at a rate faster then the metal not directly around the holes causing alot of pressure, this preasure is also converted into heat inside the rotor material. This is why a drilled rotor will crack around the drills, the metal gets so hot the whole rotor expands and contracts when cooling at direrant rates, thus causing the cracks.

Remember As in relation to cooling only!! >>

P.S. Joe,
He has the same rotors you have....

and how did we get back on this thread, Its been dead for months...
Dave