Any reason to not buy the cheap rotors from somewhere like oreillys. I see lmr and others listing rotors for quite a bit more.
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Any reason to not buy the cheap rotors from somewhere like oreillys. I see lmr and others listing rotors for quite a bit more.
I've been running a set of Duralast Cobra rotors from Autozone for years. The first few years we'd get the typical heat cracks and the last several years we would rotate the car forward or backward after a track outing to dissipate the heat in a separate area of the rotor. We get a full season out of the rotors including crossover events, nationals and test and tune before nationals.
For 2018 we tried a Ford manufactured rotor that was a little less money. We were able to run a full season on them minus cross over events but did run test and tune before nationals and nationals.
For Team Incidental Contact we cant argue about the durability, reliability, etc about the inexpensive brake rotors.
I run the "good" rotors that Advance sells. I've never gotten a full season out of any rotor, these are cheaper and last as long as Napa's best. Hallett is a death sentence to any parts store rotor. I showed up with brand new rotors this year and at the next event both rotors cracked. Typically I show up with rotors with a couple races on them and they die at Hallett. 2 piece rotors is on the to do list because I'm sick of keeping an ear open for a rotor about to let go in the pits.
This is my somewhat non-scientific observation - I'm sure someone else can correct me if I stray into nonsense land.
David uses the OReally rotors. We were routinely getting more than a year out of them before
they cracked a face. Near the end of life we'd see a lot of surface checking though.
A new rotor is more likely to crack at Hallett due to the extreme heat cycling that happens there.
A rotor that has been work hardened through many less-severe track sessions should be fine at Hallett.
At least that is my observation from wrenching on OiF #39. Also, a big player, again from my
experience with #39 at Hallett, is to make sure you have a nearly new brake pads on the front
rotors so the heat capacity of the pad is a little better (also more pad reduces the brake fluid
heat uptake a little bit I would think).
Just my 2¢.
When I ran the 13” Cobra setup, I used O’Reilley’s rotors and the would last an average of 3 track DAYS. After going to the floating rotor setup and 4-piston Stoptech setup, the first used set of rotor rings lasted three seasons (and never failed, were just replaced prior to a failure). The “new” set went four seasons before I parted out the car.
Just curious, assume you had brake ducts for both of those configurations.
We have had trouble getting good ducting set up on #39. I think Pranav has
one of the better duct setups for the 4th gens. I know at Hallett good
air flow across the rotors really makes a difference for heat dissipation and
in late race brake modulation, which I would bet is brake fluid temp related
as much as pad/rotor temp.
Thoughts?
I also used to burn through a set of rotors every 2 weekends when I had stock cobra rotors. Now I have cobra calipers but I upgraded to Craig's old set of 2 piece rotors when he went to AI, 1 set of rings has made it all season (had 2-3 on them when I bought them) and pad wear seems reduced. I have ducts (but not good ones). The pimpy 2 piece rotors do make a difference.