Topic: Brake Rotor Airflow

We are upgrading the brakes on our craptastic racing machine and the new front rotors are sourced of a newer-ish form mustang 2015-2020..  the airflow on these come  from the front face outboard side of the rotor, not the rear side like older conventional brake rotors..

Any thoughts on the change in design as to why they did this vs the air entering the back spindle side of the rotor?

The rotors are 14” in diameter and 1.25” thick so I think there is enough of a heat sink for them to be ok..

Just curious as to why the design change and is it better or worse..  we don’t have air ducts to our brakes..

Re: Brake Rotor Airflow

I'm a bit confused what you're asking. There's a vehicle out there that tries to feed air into the outer circumference of the rotor, from the rear?

Rotors conventionally (I want to say always) cool from the inner hub to the outer circumference, with air flowing outward through the vanes.

Full Ass Racing
#455 Piñata Miata

Re: Brake Rotor Airflow

I think he’s saying that the air comes from the outside (through the wheel) rather than from under the car, but still feeds center to outside (centrifugally) like you are describing.

Honestly I have no opinion on the performance pro/con of sourcing the air through the wheel versus around the hubs under the car.

Re: Brake Rotor Airflow

Yep.  Buddy of mine has these same brakes from a '15 Mustang GT on his Lemons car. It's like the rotors are on backwards.  Very weird.  I guess the premise is the airflow comes from the outside of the wheel side.   Makes running traditional ducting a moot point.

Captain
Team Super Westerfield Bros.
'93 Acura Integra - No VTEC Yo!

Re: Brake Rotor Airflow

Looking at RockAuto it appears as though one could get replacement rotors that are fed air
in the more traditional manner. What's difficult to tell is whether the vanes in the vents will pump air
through the rotor, or not, for the front-side feed rotors. It doesn't appear as though there are L/R-sided
rotors in the Standard Replacement category.

Front-side air supply may not provide enough cooling since there is no forced air. Dunno.
Maybe Ford is using the low pressure under the car to draw the air through the rotor. Seems optimistic to me.

Capt. Delinquent Racing
RUST-TITE XR4Ti - '21 ARSE-FREEZE-APALOOZA  I Got Screwed
The One & Only Taurus V8 SHO #31(now moved on to another OG Delinquent)
'17 Vodden the Hell - (No) Hope for the Future Award, '08 AMP Survivor, '08 ARSE-FREEZE-APALOOZA Mega-Cheater

Re: Brake Rotor Airflow

Hmmm, I think I understand what's going on(?) ... When I was in FSAE, my senior advisor/professor was into building drag bikes, he worked with Harley's. He said he doesn't like imports because anytime he touches them he make less power, but with Harley's he can do ANYTHING and it'll make more power; I feel like this can be applied to Ford. I'm usually an OEM is best and the engineers knew what they were doing sorta guy, but some of the stuff I've seen on domestic vehicles really makes me wonder. I wouldn't overthink it... as long as there's airflow it'll make a world of difference. Wheel wells are traditionally high pressure/low velocity.... just shove some clean air in there.


@DelinquentRacer: I've never been under a mustang newer than the foxbody but do they have a flat belly to generate low pressure? This sounds way too intricate for a mustang! haha

Full Ass Racing
#455 Piñata Miata

Re: Brake Rotor Airflow

I prefer to do flow from inside, not outside. since its easier for me to do a duct to cool the wheel bearing, and that air can go into the rotor. If you doing the mustang, earlier model GT had the same rotor size, but inside intake.

https://www.facebook.com/greatglobsofoil/
This car....Is said to have a will of it's Own. Twisting its own body in rage...It accelerates on.
1978 Opel/Buick Isuzu(B) - IOE, C class, Incredible Feats in Badge Engineering; 1996 Ford Probe GT(B)

8 (edited by DelinquentRacer Yesterday 10:45 AM)

Re: Brake Rotor Airflow

Haven't been under one lately, but with CAFE and Drive-by Noise Standards were
seeing more and more undertrays and plastic smoothing panels. AND You can get video displays underneath, too.
https://st.hotrod.com/uploads/sites/21/2015/10/2016-ford-mustang-shelby-gt350-first-drive-14.jpg

Capt. Delinquent Racing
RUST-TITE XR4Ti - '21 ARSE-FREEZE-APALOOZA  I Got Screwed
The One & Only Taurus V8 SHO #31(now moved on to another OG Delinquent)
'17 Vodden the Hell - (No) Hope for the Future Award, '08 AMP Survivor, '08 ARSE-FREEZE-APALOOZA Mega-Cheater