Saw these Rotors, Are they a good deal? Options

[coustoe]

saw these on ebay free shipping too

http://cgi.ebay.com/ebaymotors/ws/eBayISAP...&category=33564

I searched the forums and people were paying $250 before, seems like a good deal, anyone buy these?

[remjay]

wow..just wow, you guys really need to become informed before spreading such ludacris "knowledge".

Today there is no need for cross drilled rotors. Other than you like the looks enough, there is no performance benefit to using them, unless you are using brake pads made 50 years ago. Slotted rotors were initally concieved since early brake pads gave off gasses when heated from performance driving. Why? Because the gas acted like a lubricant in that it formed a thin layer inbetween the pad and rotor. This, obviously, lowered the coefficient of friction, thus lowering brake efficiency. It worked nicely, however with time came change and now a days brake pads do not suffer from this "gassing"

So basically, these drilled rotors became more of a asthetic piece. No they do not lower temps, actually they might even raise them since the holes remove the effective surface area needed to dissapate the heat. Also, as it has been posted already, the holes increase the stress in the rotor, making cracking more likely. The holes could even act as cheese grater for your pads, slicing/shaving pieces off.
[The exception being motorcycles where the damn rotors look like swiss cheese themselves- but the stress/pad wear issue is still a factor; this is just done for weight savings..nothing else] <-- Its a trade off: longer pad life/lower temps vs weight.

Think about it...how many nascar/f1/etc do you see with drilled rotors?



Slotting is a little different...this can actually have some benefit. The slots can help keep the brakes clean of glaze and whatnot that can lower brake efficiency. However the cuts shouldnt be deep and cut correctly for their to be any tradeoff benefit.



As for going with cheaper ebay rotors...all i am going to say is you get what you pay for. Those cheaper rotors probably started off with mediocre blanks at best..and drilling holes sure isnt going to help. I dont mean to come off as a pompous jerk; Its your car and money do with it as you wish...just dont go spreading false info.