An interesting side note... if friction has nothing to due with area, why are race car tires so wide?
They know that they look good and people buy those type of cars as much as a fashion statement than anything elseYeah, I do.
Drilled rotors from factory on viper, ferrari and both porsches. Boxster Spyder is sitting outside.
What would the engineers at the OEMs know about drilled rotors? Hmm.
Only cars that don't have drilled rotors are my mustang and audi.
I prefer non drilled rotors by the way.
I should clarify, Iron rotors with drilled holes are where the problems start. Carbon ceramic rotors with holes are fine because they aren’t drilled. When you drill a piece of metal you actually develop very small cracks, similar to how a piece of wood sometimes cracks when drilling. Most of the OEMs follow this standard by ”forging” the iron rotors with the holes so the metal goes through the heat curing process with the holes there. But most if not all of the aftermarket parts actually use a drill. When you subject your car to the track the heat produced will develop cracks around these holes, eventually even with the forged type. Please understand this is not an opinion it is a proven fact that I as an automotive engineer have had to work with. Rotors like brake pads are wearables anyways, so you’ll replace them either way. The opinion comes into play that I don’t recommend tracking with drilled rotors. You will develop cracks around the hole, just depends on how fast your driving.Yeah, I do.
Drilled rotors from factory on viper, ferrari and both porsches. Boxster Spyder is sitting outside.
What would the engineers at the OEMs know about drilled rotors? Hmm.
Only cars that don't have drilled rotors are my mustang and audi.
I prefer non drilled rotors by the way.
I wasn't... friction is not related to area, but even some engineers have a hard time answering the question.
Exactly, not to mention I have been to scca events that do NOT allow drilled rotors on the track and it is due potential cracking.Depends on what you're using it for but generally there will be no difference or worse performance. If you are using it for the street then you won't notice a difference. If you use it for the track then you'll find you get worse performance. Yes they may cool better (depends on ducting and airflow to the rotors) but you're losing surface area. So your pad bite will have less surface area and lose some of its stopping power. In addition, you'll find that when they reach their maximum rated temperature they will develop cracks around the drilled holes, this will eventually ruin your rotors. My advice to anyone tracking their car is to stick to blank rotors or slotted rotors. The drilled rotors you see on racecars replace their rotors after every race and are generally not drilled but forged with the holes. Drilled are mainly for looks, and they do look very good!
Because tires have properties besides friction that affect their job.
Yes you're right but there are a lot of there properties that effect braking performance that do have to do with surface area that you are neglecting. Engineering ain't that simple bud.
My thought is that I haven't heard of a car in Formula 1, NASCAR, or any endurance racing series use rotors with holes or slots in them. Not in my lifetime.
I've been doing it for 34 years...!
