Got a question for you guys, looking to replace my brake rotors on my '91 na, the question of slotted or crossdrilled has come up. I like the look of the crossdrilled rotors, but am I compromising anything for the looks? Is one better than the other? They have a nice complete set at www.rx7.com .

Thanks alot

AKABILLY

 

Go with Slotted brakes.
Cheap cross drilled brakes will fail structurally. Slotted ones won't and they have better stopping power.

 

https://www.rx7club.com/vforums/show...threadid=31852

Thread that is **currently* under discussion
Might want to try doing a search, eh?
regards
Crispy

 

A bit of history. Cross drilled rotors were originally introduced to combat the pads nature to "gas out" or expel a gas as a by-product of their heat cycle. The gasses created a fine fluid layer (gasses are fluids too) between the pad and rotor and hampered braking efficiency. For the most part, gas out is a thing of the past attributed to organic pads. Therefore cross drilled are used mainly for there light weight in racing applications or looks on the street. Slotted rotors have the same upsides as cross drilled without the dramatic loss of mass (important to cooling), or the shear amount of possible stress risers. A benefit of both is the cheese grater effect that can reduce glazing of a pad.

Having said that, naturally removing mass from an object and introducing surface area and stress risers will make it weaker. Do cross drilled rotors crack? Yes. Do solid rotors crack? Yes. IMO, cross drilled look cool and I'd use them on my car knowing that I'd get no real performance benefit other than the lighter weight (which equals less cooling) and that they might not last as long.

Chris