Good research... Never cared for drilled rotors. Much prefer slotted or dimpled.
Yah, I had also been looking at sloted&dimpled rotors. At least the dimples dont provide a straight through hole, and thus I'm sure they dont weaken the rotors as much as crossdrilled. But it seems like dimpled rotors could only be advantageous by addressing the "outgassing" problem that was solved with new brake pad compounds 40 years ago. Sure, they provide another edge to sweep the brake pad surface, but in this respect, they could only sweep a small portion of the pad surface. So therefore they are less effective at that one benifit than are slots. And the fact is that when you remove material from the face of the rotor you are removing material which contacts the brake pads and creates drag while absorbing heat. You effectively lower the friction area of the rotors and reduce the amount material in the rotors which can absorb heat, thus causing the heat from braking to be concentrated in a smaller area than it would be with solid or just slotted rotors. Sure, slots could cause some of the same things, but they provide a noticeable improvement in initial bite and wet weather performance. Dimpling AND slotting just increases these side effects without increasing the gains. Then again, they DO look nifty. I personally think only things that are functional can ever REALLY look good. And THATS why I dont have a stick on hood scoop from walmart on my car. :laugh:Good research... Never cared for drilled rotors. Much prefer slotted or dimpled.
Scam? Strong language...Today, crossdrilling rotors only serves to make a rotor look cooler and to create stress concentrations that can lead to rotor failure.
No. The reason they make them is so that people will pay more for a product that only has material removed. A large part of the consumer base THINKS they have an effect, and so they will pay more for a product that takes almost very little cost to produce over solid or slotted rotors.Scam? Strong language...
So one of two reasons brake manufacturers make crossdrilled rotors today is to increase chance of failure? That conclusion doesn't hold water.
No, i dont mean to say they WILL always fail, or that every brand will, its just that there is absolutely no evidence whatsoever that they provide any kind of benefit, yet there is definently evidence that crossdrilled rotors are not as strong as slotted or even dimpled rotors, and there are a ton of cases where this has led to failure.dysan said:I've had my Rotorpros drilled & slotted rotors on my '05 stang for over 70k miles and they are still great. No warping, no cracking and they stop just fine.
I really think it depends on the quality of the rotor and that they are broken in properly after installing them from my experience.
Im sorry, I did provide one pretty vivid example of failure, unfortunately I had already closed out the other one when I posted. Still though, if you read through that forum post I put a link to about the person who had his crossdrilled R1Concepts rotors fail, you will see atleast 4 other people talk about having similar severe cracking issues, though most where caught before the point of complete failure.i like when people say "tons of cases" without really documenting anything,
the fact is i agree with you, why are they more if they are only removing material.. "its has to be made with precision holes and what not" meh, arguable
Hahahaha, Exactly! .It's like jeans with the holes already in them....you pay more for less material. :laugh:
There's lots of engineers, fabricators, designers, racers, etc on this site.Anyways, I am a mechanical engineering student specializing in automotive race design, so I may very well have Function over Form as a much higher priority than most, and thus I am far more bothered by what i found out than most people probably would be....
Actually, yah. Why are their fake air intake ducts on the Honda S2000? Why are there fake brake cooling ducts in front of the rear wheel wells on the Mustang GT/CS? Why does the Dodge Challenger R/T have a fake carbon fiber stripe on its hood? Why do the lexus IS-F and quite a few different Porsches have fake quad exhaust tips? Because they LOOK like they make things go fast, so consumers will pay more. :bigthumbsupIf you're so bothered by what you "found" write to Chevy and the Corvette engineering team since every Z06 and Grand Sport vette has cross-drilled rotors :bigthumbsup
or maybe they put them on just for looks?
It's common knowledge among those that put their brakes to heavy autocross or roadracing use.On another note, I am slightly disturbed by the fact that I had to search so hard for this information. I feel like this should be common knowledge that is mentioned to anyone who discusses buying crossdrilled rotors, which i definitely did not see while looking through some of the archived threads.
I guess thats what bothers me. I normally just shake my head at those doing mods solely for the "cool" factor, but in this case, that obsession with looking cool has resulted in the knowledge that purely asethetic advantage of crossdrilled rotors generally comes with greatly decreased durability and strength which can result in catastrophic being largely lost, or at the very least uncommon. Many people could be putting themselves at risk to making a mistake that could cause massive failure and expensive property damage without even realizing that the perceived performance "benefit" is all myth and illusion.A lot of mods people get are for the "cool" factor, so forum discussions aren't always the best source for technical research.
How many time have you seen people posting about wanting big cams, and the first thing they say is for the bad ass sound?
That's funny! :laugh:Thank you, I learned something here and am now a smarter person :smartass:
Hey man, we all gain some of those brain-nerve-thingies from somewhere....I like the neurons I have...what about u??That's funny! :laugh:
When ModularMuscle finished saying he learned something from reading this thread, he used the smartass smartass smilie, which I found amusing...if that's what you're referring to?Hey man, we all gain some of those brain-nerve-thingies from somewhere....I like the neurons I have...what about u??