Directional Rotors and Straight Vane Rotors
We often receive questions regarding which way are rotors are supposed to face when installed.
There is a misconception that ALL rotors must face a certain way for maximum cooling efficiency. The answer solely depends on the internal vane structure of the rotor itself— whether, the vanes are straight or directional vanes.
On most vehicles, the factory brake rotors are usually straight vane rotors. This means the vane structure (internal) of the rotors are built straight from the center going outwards. Thus, if you have a straight vane rotor, the direction of the slots or holes is completely up to the buyer.
There are also a handful of cars that do come with directional rotors. Directional rotors have curved or an angled internal vane structure. For directional rotors, it is recommended to install the rotors based on internal vane structure and not on the direction of the slots or holes. This allows the rotor to “naturally” generate a vacuum effect that will pump air throughout the rotor which helps its cooling efficiency.
Exceptions to the Rule
There are some vehicles has the same factory directional rotors all around. Thus, you may have all right or left directional vanes all around.
For example, the Mini Cooper S has 4 LEFT directional vane rotors. That may not be obvious with the OEM Blank rotors, but if you take a look at the internal structure, that would stand true. The Mini Cooper S is equipped that way from the factory, and at R1 Concepts we follow OEM standards.