What??, holes disapating heat especially at slow speeds.??? Who doesent know what they are talking about??? The more mass you have in the rotor the better it is at taking the kinetic energy of the truck and convWhat??, holes disapating heat especially at slow speeds.??? Who doesent know what they are talking about??? The more mass you have in the rotor the better it is at taking the kinetic energy of the truck and converting it to heat, absorbing it then dissapating to the air. The more metal you have the more heat it can absorb. The heat then has to get out of the rotor and the holes are not going to do anything to help that. They are not to help ventilate the rotor, the center vains are there to help do that as they create a pumping action caused by the certrifical force when going fast. The holes were originally put there in an attempt to take care of some of the out gassing that happens when pads get very hot very quickly and to possibly to improve contact and possibly to clean the pads. You can still find some race teams using them but most if not all Ive seen have gone to either solid rotors or slotted. If you have ever experienced Green fade you know what Im talking about.

Now going slow in a jeep is a totally different situation. There is very little to no air going over the rotors so you rely much more on the general mass of the rotor to be able to absorb the heat caused from changing the kinetic energy of the truck into heat. Now at those very slow speeds the center venting vains and especially those holes are useless and your gonna rely on just radiation back into the air. Lucky that the heat generated going slow braking down a hill is much less than slowing from speed that I doubt any of you have experienced brake fade on a rocky trail even with the stock crap rotors. If your really worried about it, especially for wheling, your much better off going with much bigger rotors with a lot of mass in that situation or add cooling fans to move air over the brakes.

Go ahead and buy them if you think 1980s technology voodo is gonna help you... erting it to heat, absorbing it then dissapating to the air. The more metal you have the more heat it can absorb. The heat then has to get out of the rotor and the holes are not going to do anything to help that. They are not to help ventilate the rotor, the center vains are there to help do that as they create a pumping action caused by the certrifical force when going fast. The holes were originally put there in an attempt to take care of some of the out gassing that happens when pads get very hot very quickly and to possibly to improve contact and possibly to clean the pads. You can still find some race teams using them but most if not all Ive seen have gone to either solid rotors or slotted. If you have ever experienced Green fade you know what Im talking about.

Now going slow in a jeep is a totally different situation. There is very little to no air going over the rotors so you rely much more on the general mass of the rotor to be able to absorb the heat caused from changing the kinetic energy of the truck into heat. Now at those very slow speeds the center venting vains and especially those holes are useless and your gonna rely on just radiation back into the air. Lucky that the heat generated going slow braking down a hill is much less than slowing from speed that I doubt any of you have experienced brake fade on a rocky trail even with the stock crap rotors. If your really worried about it, especially for wheling, your much better off going with much bigger rotors with a lot of mass in that situation or add cooling fans to move air over the brakes.

Now I see that you bought the larger brake kit, that will actually help because you have a more massive rotor. so larger heat sink...

Go ahead and buy them if you think 1980s technology voodo is gonna help you...

 

Huh? Your post seems oddly constructed and tough to follow. Nevertheless, Most of the downhills around here are at plenty of speed....that's why we are using our brakes! I can feel and see the difference using slotted rotors in every vehicle I have used them. Don't knock them until you try them.
If you believe solid metal dissipates heat better than drilled, then you have never cooked in a professional kitchen my friend. Grab a hot pan with a solid handle vs one with a drilled or spring. Go ahead. And this is on pans that aren't even moving.
BTW, my background is as a research scientist for 15 years, before becoming a custom builder, so take what you want from my comments, but I'll take on anyone in downhill and wet condition braking contests any day with my setup, even with the added weight of The hemi.

 

Honestly I stopped reading that post after the first three sentences it made no sense and I have no idea how somone could even type it out that way...


And rinkish, I'm surprised at your response... Why keep stock when there are plenty of upgrades available... You know the rules about upgrading. If you can do it then DO IT.

 

The bottom line is that materials designed to dissipate heat better do so at all speeds. Furthermore, you can generate a lot of heat in a fully loaded jeep running 37's down a 10% decline at 25 MPH just as you can in a light race car going into a flat corner at 70. You can smell slow moving semis burning their brakes all day long coming down Vail pass, and they have massive brakes. If it were just about mass, then maybe we should replace our radiators with simple slabs of steel?I guess I also get no benefit from that AEV heat reduction hood either. Damn Voodoo science!

 

Ditto. Although, when I had them on my track car I did notice the improvements (shorter cool down periods) much more, but that's not to say I didn't see any difference on my CJ and soon on my JK. I had the dimpled/slotted rotors from brakeperformance.com that came zinc coated (all black). I'd definitely say there is a noticeable difference especially going down inclines.

 

Rebel Offroad makes a good setup for brake upgrades, without having to change to a larger rotor or MC like the Teraflex setup.

http://www.rebeloffroad.com/Off_Road...rakes_s/59.htm