[QUOTE=Nofar,May 13 2009, 10:11 AM] mikegarrison,
What exactly did I mention that is counter to data, or unsupported by data?

 

I agree that there are better/worse areas to place holes that affects rigidity. However the locations of the holes was not the statement that I made. In fact I talked about how the holes were made, either by drilling or casting, which may have an affect on rigidity, all else equal. If you are not convinced about the concept of stress concentrators feel free to look it up yourself.

And to the other point, if you read my post I did mention that sloted rotors by themselves do no provide the significant performance difference, but in fact the other factors (tires, pads, etc) I mentioned contributed more. So I do agree with your statement, it's just different wording that my own but the same point. I think you're splitting hairs here.

I'm a mechanical engineer by degree experience so I'm quite familiar with setting up, performing, and understanding testing and results in a controlled environment. I have not spoken of any test data because I have none to present....that's not my point in this posting. My posting listed a qualitive comment about design, and the necessity for these products. If the OP wanted quantitative data, this is not the forum for that and I doubt anyone would have such data readily available on this forum.

 

I fail to see how this would have any effect on rigidity.

This "cast v. drilled" stuff has been floating around on the net without any attribution for at least a decade, and probably a lot longer than that. Usually with the explaination that "Porsche uses cast holes, and that's why their drilled rotors aren't just poseur crap." If you can explain the importance of the distinction, and especially if you have any references to support your explanation, I would like to hear it.

And feel free to be technical if you like, I'm an aero engineer myself.

 

brembo cross drilled and slotted worked amazing for me, 3 track days and a few pad changes and city driving on the same rotor and they had lots of meat left. do the people that talk negatively about drilled and/or slotted rotors have any hands on experience with them?

 

If you ever get to where you are doing more than a handful of track days, you will find that the failure mode of brake rotors on the S2000 under track use has nothing to do with how much "meat" is left on the rotors. The failure mode is cracking due to the cyclic thermal stress.

 

sorry, i wasnt trying to make a correlation between anything and how much meat is left. It just sounds like alot of hearsay. Please explain the difference between 3 track days in 3 days vs 3 track days in X amount of time.

 

Well, I edited my post to reword that. I just meant that when you do a lot of track use and very little street use, the thermal damage to the rotors completely overwhelms the mechanical wear aspect.

 

go w/ EBC rotors...dimpled not drilled so no worries about structural integrity...and they're pretty reasonable at about $500 for a set of 4

 

mikegarrison,
Again, I think you're splitting hairs with regards to my posting. Let me be clear about this. I am saying that there is a slightly higher probability of a deformation forming due to the a hole being placed in the rotor, versus a rotor without holes. Any time you are alterning the geometry of a product, wither to drill a whole or machine a feature, you ware distoring the geometry. This may have an effect...."may" is my key word....it depends on the specific features, etc. I'm not saying anything negative, only stating the qualitative understanding of applying unknown changes.

I don't have the time, or the wish, to expound about this and perform calculations in this forums here. Being that we are both engineers with mechanics backgrounds I would feel that you could look this up on your own with any textbook available to you....or a simple internet search.

Christopher

 

Since you were the one making the claims, why am I supposed to be the one that researches them?

My complaint was that your claims are unsupported by data, and I think it is now clear this is true, since you don't seem to have any supporting data you are willing to share with us.