Quote:
|
Drilling and slotting just gives you more friction on stopping.
|
Nope. You just reduced swept area. You get less stopping power (though the difference is slight).
The advantage to slots is supposedly keeping the friction material cleaner and to provide a path for gases generated during braking to escape from between the pads and rotor.
Cross-drilling is to reduce unsprung weight and rotating mass. Cooling is not enhanced. Proper cross-drilling requires chamfering each hole on each side of each surface. This removes sharp edges that are stress risers. Cross-drilled rotors are proven to be more prone to cracking than solid rotors.