Is there a big need for vented rotors i was thinking about going with decla rotors for the front and oe in the back but would my money be better spent just to get some oe rotors form like autozone are somewhere and put the money in mods?
Mustang5L5 said:There is actually very poor airflow in recessed perpendicular to laminar airflow.
DTNODYA said:What does that mean?
Cantslowdown said:So its really just for show and looks...
Mustang5L5 said:Flowing air can't turn 90 degree corners that well, so airflow through the crossdrilled holes is actually very poor.
This of it as if it's a very windy day with the wind blowing down the street and you duck into a small alley between two buildings. It would be calm in the alley.
DTNODYA said:Gotcha
So would they function better if you routed some hose/tubing ... so that a air would be forced onto the brakes (like the rear on cars with the functional side scoops)?
Mustang5L5 said:Yes and no.
If you are referring to venting air onto the crossdrilled rotor than no it will not help. Venting air to the rotor does help, but the airflow must be directed at the center open area.
The rotor acts as a centrifigal pump. In other words when it spins, it slings whatever is in the middle outwards through the center vents outwards. To help this process, you can rout a hose to direct air at the center "hat" area of the rotor on the backside. This will feed nice cool air to the rotor so it can "pump" it through the vents in the center.
This is why solid rotors perform well. There is more mass to absorb and distribute the heat and more surface area to contact the air rushing outwards through the cooling vanes.
crossdrilled holes are for race pads which expel gases during braking. The holes give the gas a place to escape toso they don't build up under the pad and push it away reducing braking. That is their only function. They do nothing for cooling at all.
They do look good though and i don't fault people for running them. It's just that a lot of people are misinformed about their function and routinely claim to feel a difference. The truth is when you switch from stock WORN out brakes and pads to new rotors and pads, you will feel a difference even if running crappy Autozone $20 rotors and $10 pads. New stuff always has good bite. They won't last long of course, but my point is people are comparing their buttmeters with the new crossdrilled parts to their old worn-in setup.
With that said i run crossdrilled rotors