Brake cooling Q's
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 955
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From: Jersey Shore
Brake cooling Q's
When ducting air to the brakes, do you want all of the air going to the rotor veins? Is it better/worse to cool the rotor surface as well? Heres where I am as of now:
Going to weld this pipe to the dust cover (cutting the rest of it away), and weld another piece on the inside to direct it to the veins. Heres where my question comes into play- While more than half of the pipe will be directed into the veins, the outer half will be blowing air on the rotor face. Is this acceptable?
Going to weld this pipe to the dust cover (cutting the rest of it away), and weld another piece on the inside to direct it to the veins. Heres where my question comes into play- While more than half of the pipe will be directed into the veins, the outer half will be blowing air on the rotor face. Is this acceptable?
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
I haven't experienced it myself, but all the technical articles I have read on the subject warn that cooling one side of a rotor more than the other side can cause the rotor to warp towards the cool side. You'd be better off to seal the output of your duct to the center of the rotor so all the cooling air goes out through the cooling vents.
Pete
Pete
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 955
Likes: 50
From: Jersey Shore
I haven't experienced it myself, but all the technical articles I have read on the subject warn that cooling one side of a rotor more than the other side can cause the rotor to warp towards the cool side. You'd be better off to seal the output of your duct to the center of the rotor so all the cooling air goes out through the cooling vents.
Pete
Pete
Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Oval the end to get as much as you can towards the center. I have the 13 inch aluminum hat Wilwoods and I have removed my ducting for street driving. I need some temp in my pads to really make them work and they are just to cold on the street.
Drifting
Joined: Apr 2007
Posts: 1,970
Likes: 45
From: Cameron Park CA
That is what I had read too. What I dont understand is why the rotor face is different than the vanes in terms of cooling. If the rotor is spinning, then an equal amount of the rotor is being fed fresh air. Only one side of the vanes getting air, so why would it matter if the rotor face was getting the same? I just finished cutting the dust shield to fit the pipe... I have the pipe as close to the spindle as I can get it:
As gkull says oval the end of the duct. That will ensure that air won't cool just one side of the rotor.
Pete
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 955
Likes: 50
From: Jersey Shore
If the cooling duct directs the air to only the center of the rotor and it enters the cooling slots, the air will be forced outward and cool both sides equally. If you aim the duct to cool one side of the rotor, that side will expand less than the hotter side. You'll get a saucer shaped rotor. Not good.
As gkull says oval the end of the duct. That will ensure that air won't cool just one side of the rotor.
Pete
As gkull says oval the end of the duct. That will ensure that air won't cool just one side of the rotor.
Pete
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 955
Likes: 50
From: Jersey Shore
Just a quick update:
I ovaled the pipe to cool only the vanes and welded it to the dust shield. (still need to clean up my welds and trim the dust shield better)
Going to clearance the pipe-to-rotor a bit more
I ovaled the pipe to cool only the vanes and welded it to the dust shield. (still need to clean up my welds and trim the dust shield better)
Going to clearance the pipe-to-rotor a bit more
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Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I was thinking if you took the tube and just put one end in a vise and oval it. That way you still have one round end for the ducting flex air line.
But what ever works is the most important
But what ever works is the most important
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 955
Likes: 50
From: Jersey Shore