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  #1  
Old 05-13-2019, 02:29 AM
Rotorblade Rotorblade is offline
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Brake cooling intake

I would like to show you a pair of carbon fibre intakes I intend to connect to neoprene air ducts. The CF - aluminum combination looks nice I think. They finish is not too good because I had some problems with the moulds and the vacuum as well and had to do a lot of sanding.
The shape was chosen so that they fit into the space I had and also to make the mould easier to cover with the CF sheets, although it's not very effective in collecting air. The air ducts are 52mm in diameter, hopefully they will make a difference on the track.
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Old 05-20-2019, 04:50 AM
Rotorblade Rotorblade is offline
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I've managed to fit the air duct to the left wheel using 2mm aluminum sheet. The brackets may need reinforcement like for example a 90degree triangle to make it hold against vibrations although it sits firmly as it is.
The heatshield adaptor lets the air into the center of the disc unrestricted. It's basically a bent pipe so that the section area remains the same, only the shape changes gradually.
The hose clamp is aluminium so it case something goes wrong the aluminum sheet doesn't damage, but it is also riveted to the adaptor.
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Last edited by Rotorblade; 05-20-2019 at 04:57 AM.
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Old 05-20-2019, 07:51 PM
Andyz4 Andyz4 is online now
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That is an impressive bit of fabrication. Do you track your car?
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Old 05-21-2019, 03:25 AM
Rotorblade Rotorblade is offline
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Thanks. I usually go a few times a year to a racetrack and do 1 or two sessions of 20minutes. The brakes get hot quite fast I can do 1 or 2 laps with moderate braking before a cooling lap is needed. Last year I've installed a set of EBC yellow pads with ebc discs and pushed them too much (after breaking them in) because I thought they will handle heat better and the fluid boiled. I didn't know when to stop. When they are hot they start vibrating slightly and that should be the signal for a cooling lap. Hopefully with this vent system the brakes will last a bit longer and wear slower.
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Old 05-21-2019, 10:24 PM
Andyz4 Andyz4 is online now
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Thats cool..literally. If the fluid boiled at all, time to change it as it has water in it and will only get worse. Also check your rotors. Mine were vibrating slightly too and after a track event this weekend I pretty much destroyed them. My fault for not replacing them sooner.
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Old 05-22-2019, 01:19 AM
Rotorblade Rotorblade is offline
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I bled the brakes and they work fairly well now. I did some practice sessions and it was fine except when they get hot they vibrate but they also did the same when they were new.
I made some reinforcement of the plate adaptor
Also noticed the neoprene hose was a bit rubbed by the suspension elements
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Old 05-24-2019, 09:45 AM
Rotorblade Rotorblade is offline
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I've tested them through torrential rain and deep puddles and they don't seem affected at all by water.
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Old 05-24-2019, 12:02 PM
lmacmil lmacmil is offline
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Quote:
Originally Posted by Andyz4 View Post
Thats cool..literally. If the fluid boiled at all, time to change it as it has water in it and will only get worse.
Fluid boil doesn't necessarily indicate water. Just means that it got very, very hot (446F for fresh fluid.) However, any amount of moisture will lower the boiling point so it would be a good move to start a track session with fresh fluid.
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Old 05-24-2019, 01:32 PM
Rotorblade Rotorblade is offline
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The fluid was all replaced before doing those laps it's extremely unlikely it has water in it. It is a motul RBF660 with a high boiling point (over 600F). When it boils it produces vapors that aren't reabsorbed except for a small amount so bleeding the brakes is required to get rid of the gas, but I don't think I need to replace the whole quantity.
After the episode when it boiled I did laps and got the brakes to their limit when they start to slightly vibrate but the pedal feeling didn't change at all so the fluid didn't boil anymore. When I boiled the fluid the brakes begun to vibrate and I didn't stop and did several laps then they started to vibrate harder and only after the pedal became soft I stopped driving hard and did a cool down lap. Now everything seems ok, the discs look smooth don't have cracks and the car stops well especially from high speed.
Now my plan for the future track use for a session of 25min is to do a 10min drive then cool down lap then another 10 min drive and a and another cool down lap even if though with the brake ducts upgrade they might stay cool longer.

Last edited by Rotorblade; 05-24-2019 at 01:43 PM.
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Old 05-24-2019, 09:15 PM
Andyz4 Andyz4 is online now
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Sounds like you got it dialed in. That Motul is good stuff.
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