Quote:
Originally Posted by import111
differences:
1. A 2 piece rotor usually uses an aluminum center (hat) which transfers less heat to the wheel, and there for, wheel bearings and other parts.
2. Because of that aluminum hat listed above, 2 piece rotors weigh less, which lightens the car as a whole, lightens the front (which is good if the front of the car is the heavier part), and gives the brake pads less weight to clamp onto which in turn should make for shorter stopping distance (if the tires can manage).
3. From what I have seen in 2 piece rotors, the cooling veins are better designed to evacuate heat.
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Add to number 2: it also reduces the rotating mass being driven by the engine, which means 1 pound shaved on a brake rotor is worth a lot more acceleration-wise than a pound shaved on non-rotating parts of the car.