Paging anyone with a new cross drilled rotor and blank rotor

I was wondering if someone could tell me the mass differences. Trying to solve a mystery.
Thanks
trey

I think the only 'mass' difference is all the metal that is missing (needed) from the blank rotor. Since a brake rotor is basically a heat sink, it needs all the metal surface it was designed with. :confused:

Originally posted by 99HOSS
I think the only 'mass' difference is all the metal that is missing (needed) from the blank rotor. Since a brake rotor is basically a heat sink, it needs all the metal surface it was designed with. :confused:

trust me, i understand braking dynamics :p

I just want to see if its in their head or maybe these rotors use denser iron or something:confused:

I work in the automation area of the steel industry. One of our products is a heat transfer model of the heating of steel that determines optimal temperature setpoints to run industrial reheat furnaces.

First, there are 21 basic categories of steel from a themodynamic perspective (established by BISRA - British Iron and Steel Research Association). The range of the emissivity and heat transfer behavior isn't that huge for these alloys, especially when you are looking at pieces as small as brake rotors. In addition, the relative density of the different alloys aren't all the great either. Therefore, the behavior of different alloys of steel rotors (not ceramic) wouldn't vary enough to warrant the use of different steel alloys, IMO. In addition, I would think that a manufacturer would trumpet the fact that use a "bling-bling" alloy if they were spending more money on the materials in their rotors. I haven't seen anyone really market their rotors as special alloys. ...doesn't mean it hasn't happened, I just haven't seen it. ...and even if it's done, I don't think that it would make that much of a difference... My opinion I suppose.

Now, I see serious issues with durability of cross-drilled rotors if the holes are established after the steel is solidified. This would introduce metallurgical defects in the crystalline structure of the steel and weaken it significantly. I personally would never put a car on the track with cross-drilled rotors unless they were ceramic or the rotor was formed and solidified with the holes already in it.

... Wow, KiethO, sounds like you might have become sunstroked while working turn 1 this week-end. :eek: j/k (heard ya had a fairly good time there, though)

... and I agree, unless the rotor was cast with the holes, I'd run a non-drilled, solid surface blank rotor, as I have done for the past several years with great success.

Cross-drilling is more of a 'look' these days than a necessesity, IMO.

Originally posted by 99HOSS
... Wow, KiethO, sounds like you might have become sunstroked while working turn 1 this week-end. :eek: j/k (heard ya had a fairly good time there, though)

... and I agree, unless the rotor was cast with the holes, I'd run a non-drilled, solid surface blank rotor, as I have done for the past several years with great success.

Cross-drilling is more of a 'look' these days than a necessesity, IMO. TRUST ME! I AGREE! (http://web.camaross.com/forums/showthread.php?s=&threadid=114653&perpage=15&highlight=rotors&pagenumber=2)

I have heard it from a few reputable board members (mindgame and someone else) that the addition of cross drilled helped them stop faster:confused:

There were 2 types iron they used at TRW while i was there. the density was almost exactly the same .

I was thinking that they might have thicker brake plates or something like that:confused:

I just want to know why everyone says they stop faster but it makes no sense on paper:confused:

Sorry - it was early in the morning and I just kinda jumped in there...

When you were looking for mass difference, I assumed that you were also wondering if there was a different alloy with the same volume (more density/mass).

99HOSS - Yes, this was a great weekend. Today wasn't so good because of the rain...