i think my rotors are warped since my peddle and car shakes when i brake at high speeds.

so i'm thinkin of gettin brembos..

i can get oem for like $70 or like cross drilled and slotted for like $20 more. is there any advantage of having cross drilled over the oem? its only 20 bux

 

the cross drilled rotors will stay cooler theoretically...so if you drive hard enough there would prob be a slight performance difference. I say for 20 bucks get em just cause they look good haha.

 

I'd stay with OEM

 

is there any real benefit to cross drilled? i heard ppl say theres really no difference.

will one last longer than the other?

 

Cross drilled doesn't work as well because its less material. the rotors need to absorb some heat to create the friction needed to stop the car. now when you have a solid rotor and drill a lot of holes in it, your taking out material thats needed to hold heat. so now the rotor can hold only so much heat since most of the material has been drilled away. Porsche's have like 15 inch Rotors at that size the rotor is so big that even with cross drilling there is still enough rotor left to hold plenty of heat.

But on Hondas where everyone runs 15's or 16's and your typical BBK isnt bigger than a 12.x rotor. solid is always a better choice.

 

This is not 100% true, yes it removes a little bit of mass, however it is a common mistake that it removes so much that it harms the braking, actually the airflow make more of an effect on your braking when at speed than most people realize. There are three modes of heat transfer, 1) convection {air flow}, 2) conduction {mass}, and 3) radiation {electro-magnetic waves}. When you apply the brakes you convert the kinetic {moving} energy of the car to heat. A moving vehicle has a lot of energy so it is not uncommon to see temperatures over 1000 degrees F. On the street, about 25% of the heat is removed by conduction, 25% by convection and 50% by radiation. At high speeds, the ratios shift to about 15% conduction, 40% convection, and 45% radiation. Therefore, during high speed stops, convection heat transfer [i.e. how air flows over the rotor] plays a very important role. This is where drilled rotors significantly make a difference. General Motors did a study on this if you are interested it is SAE Technical Paper 2006-01-069.

 

so what should i get? is either one more reliable and less likely to warp? or are they equal with their life spans?

 

Drilled is less likely to warp and should have a longer life span.

 

agree

I have always had better life with my cross drilled and/or slotted rotors

 

I agree 100%. I actually read that paper for school one time (Mech Eng student) but IMO, for 20$ more, you're getting blank rotors that have been drilled. Now, that said, while they are better performance wise, wouldn't it also make sense that since the rotors are drilled that the structural integrity of the rotor itself is being compromised? Lamborghini, Ferrari, Porsche, etc have their rotors created with the holes in it, meaning they were never drilled. Finally, if you think that drillling holes creates less surface area (and it does) and then ask why Ferrari and the like companies use holes in their rotors, you also need to remember they have massive rotors from the factory which makes up for that loss. Not trying to contradict you, just a thought I had

 

If you warped your rotors think about this, many places don't have capabilities of turning cross-drilled rotors. Don't even know if it's possible. If you warp these, you're stuck with your runout. Brembo blanks are great rotors. With the $40 you save on rotors (that will perform with all the braking power you need for daily and occasional track day), you can get a badass set of pads to put in there. Just my input

 

Actually this is a common myth about Porsche, Brembo, etc... having their rotors cast with the holes into it. You will never find a rotor with the hols cast into it from the foundry, they are all drilled after the casting process, Brembo will even tell you that. The idea of it was something that was spread around by brake salesmen long ago and is not true.

This also is not true. You will have alot of brake shots tell you they can not be turned. However if you run it slow on the lathe it will be fine. It will however cause additional ware on the bit and take more time. Those two reasons are why most shops do not want to do it. Many others just are not sure so they just say no to cover their own work.

 

Slotted is best **** crossed drill it'll break.

Or if anything use oem, because you get nothing but the best.

 

Many people use slotted as they have had experience with or have heard of issues with cracking. Most companies will give a guarantee against it. Also if you are really worried about it you can always have the rotors Cryo treated and it won't be an issue.

 

get power slot rotors pro stop series! theyre dimple and slotted !!! i have em in my car and they aree good rotors!!!

 

Blanks are best:
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/why-blank-rotors-better-than-cross-drilled-slotted-1437513/