Do Directional Brake Rotors Prevent Brake Fade?
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Do directional vaned brake rotors provide better brake cooling? In this video I test new brake rotors on my Honda S2000 to find out. I only changed out the front brake rotors, everything else is exactly the same (same brake pads front and rear, same brake rotors in the rear).

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Comments

    • codemiesterbeats
      codemiesterbeats

      could be the composition of the rotor itself... it probably matters more than the slots anyway.

      about 7 hours ago
    • Jeff Dodd
      Jeff Dodd

      Thanks for a reasoned explanation of the pro and cons of slotted rotors.

      about 20 hours ago
    • Douglas Kizer
      Douglas Kizer

      That left front rotor should be on right side of car.

      about 1 day ago
    • Dan Conser
      Dan Conser

      Good job following up to find out why your testing wasn't really testing them in the operating regieme that matters. Based on the track testing results you found, I'd say you ound the source of your error in methodology. And I say error, because your test results would have given you the wrong answer. Love your channel!

      about 2 days ago
    • Martin Johann Kloppers
      Martin Johann Kloppers

      Thanks for addressing the mass difference, and the difference between your tests and higher-temp track testing.

      about 2 days ago
    • Amy Sicilia
      Amy Sicilia

      Aftermarket are junk, unless Brembos

      about 3 days ago
    • Nay Natt
      Nay Natt

      for daily drive, we do not need directional rotor. stock is best, save money.

      about 4 days ago
    • malhotra roger
      malhotra roger

      If they weren’t better on the track , then all the racing teams and engineers 👨‍💻 are idiots .

      about 4 days ago
    • bossssssist
      bossssssist

      7.5% lighter at 9:17

      about 4 days ago
    • Steve Fick
      Steve Fick

      What's that Styx song? Too much time on my hands?

      about 4 days ago
    • Justin Luttrell
      Justin Luttrell

      I'm a bit disappointed in the testing method(s). I would've expected Jason to strive for more consistency and perhaps just lift one wheel off the ground (assuming open differential) and used a weight or something to apply the exact same throttle input and exact same brake pressure for a given time/test cycles.

      about 4 days ago
    • Bradley Jones
      Bradley Jones

      Rotors are backwards. Slots on the face of the rotor should face backwards but the fins on the inside of the rotor should face forward so they can grab the air.

      about 4 days ago
    • Avar GombocZ
      Avar GombocZ

      The outside grooves on that rotor does not correspond to the inside cooling vanes(I might have misspelled this word, sorry), as you can exactly see at 1.39 in your video. You mounted them incorrectly(R>L/L>R), so the cooling might be far from ideal. Redo the test...

      about 5 days ago
    • Ed Kummel
      Ed Kummel

      So, like all performance products, using them for day-to-day driving, you will not see any advantage. But push the performance past stock, then the performance products will out perform the stock. Yeah, this makes sense.

      about 5 days ago
    • Warren Rhyner
      Warren Rhyner

      Think of the brake rotor as a pump impeller pumping air. Different vane profiles of pump impellers are designed for different applications. Straight vane impellers work well for low differential pressure applications (like here). Curved vanes work well for larger differential pressures.


      Furthermore, centrifugal pumps need RPM to work. 40mph wasn't doing much for flow, so the mass of the rotor was a large factor.

      about 5 days ago
    • NamelessCarVideos
      NamelessCarVideos

      Slotted rotors aren’t for cooling. You should have done drilled rotors. Waste of time

      about 5 days ago
    • Warwick Plumsted
      Warwick Plumsted

      So the difference is insignificant for ordinary driving on the road, but becomes significant when pushing the brakes very hard over an extended period of time.

      about 5 days ago
    • Steven Evans
      Steven Evans

      Directional veins give the rotor more total surface area to use for cooling. I think they would shine in a test that measured the rate of temperature change at speed after a severe braking event.

      about 5 days ago
    • shaanee
      shaanee

      Those aren’t the type that increase cooling. Those are supposed to increase friction! Drilled is for cooling, slotted is for more friction.

      about 5 days ago
    • Emanuel Mouratidis
      Emanuel Mouratidis

      Long story short,
      bigger brakes are better and disperse the heat faster ?

      about 6 days ago
    • Rob O'Sullivan
      Rob O'Sullivan

      What about the Mu? Friction coefficient, those generate more heat during the same brake pressure which in turn makes them hotter.. Because they stop faster?

      about 6 days ago
    • Matt Moleman
      Matt Moleman

      Standard rotors were bedded in to the standard pads. Aftermarket were still a newly machined surface. More friction means more heat

      about 6 days ago
    • srspam menot
      srspam menot

      Cooling better for racing. Braking worse from less surface on the street BAD . ARE YOU RACING ON THE STREET ALL THE TIME

      about 6 days ago
    • srspam menot
      srspam menot In reply to srspam menot

      HOTTER FROM LESS SURFACE AREA

      about 6 days ago
    • Thumper 1968
      Thumper 1968

      Drilled& slotted would perform better

      about 6 days ago
    • Thumper 1968
      Thumper 1968 In reply to Thumper 1968

      billy b if I had money and time I would at least show results

      about 6 days ago
    • billy b
      billy b In reply to Thumper 1968

      Then show us your test results buddy.......

      about 6 days ago
    • J
      J

      Well why don't you just do another experiment? Heat the rotors up, pads and all, in a chamber to 200 degrees Celsius, and time it with another set of stock rotors to see which cool down fastest. You made a video to say you did the experiment wrong? I want my 12 minute back... or at least a proper heat loss experiment.

      about 6 days ago
    • J
      J In reply to J

      @billy b
      200c is just under 400f. You can do that in a busted home oven. Use a laser thermometer to measure it. Sure, it's crude, but it sure beats making a video about how your whole video is invalid.

      about 6 days ago
    • billy b
      billy b In reply to J

      You got a 200C heat chamber with a 10k lathe that won't melt laying around?

      about 6 days ago
    • Joseph K
      Joseph K

      Were you using the same pads on both rotors? It would only be fair if new rotors and new pads for each.

      about 6 days ago
    • manoman0
      manoman0

      I'll think I'll be on the right side with all these sluts!

      about 6 days ago
    • Teodor Milcheliev
      Teodor Milcheliev

      It's an old video but still. So you did a normal test, not a performance test. And the result was that the normal rotors are better. That is it. It's not just vanes, cheapeness, mass, etc, etc. It's like brake pads. Normal pad are better for normal use, like normal rotors are better for normal use. They are tested and they are tested and that is the design they stick for Normal use. You did your best to prove them wrong, but you just couldn't, because there was no way that these perform better than normal rotors in normal conditions. Remember, normal pads and rotors are designed for use in various conditions and they must perform at the best for all those conditions - high temperatures, low temperatures, rain, puddles /sudden cooling/, mud, snow, sand, sudden braking, rotor rust from car not being driven a while , etc, etc. Performance pads and rotors do high temperatures, may be rain /but not common/, a lot less mud, sand, sudden braking, pretty much no snow, with two words - track use. Are they better for the track - 100%, as everything else that is performance - Performance engine oil, Performance gear oil, Performance brake fluid, Performance tires, performance pads.... In the end your tests just show the people to not use performance parts for regular use as they are worse in those conditions. Do it for the track car and be very careful when you drive that track car on the regular roads, without putting some heat into everything.

      about 6 days ago
    • Kevin Larson
      Kevin Larson

      You stated that the stock rotors draw from the inside of the car where as the aftermarket rotors draw from the outside. That means the surface you are measuring the temp on has less of a heat sink being as it is not directly connected to the hub. And your tests were very low airflow tests.

      about 6 days ago
    • RoyalGaming
      RoyalGaming

      Is there any difrent with the grove ones of brake disks with holes in them?

      about 6 days ago
    • The Sarcastic Genius
      The Sarcastic Genius In reply to RoyalGaming

      Ya the holes allow air to cool faster and the way I drive it suits me cause I fly and sometimes when a punk ass mofo wont move or move there slow ass in my lane I have to rapidly stop and the stock rotors eventually wrap from the heat so I swapped them. And he got them backwards also the slots are supposed to face the other way. I ain't a degreed engineer but a tech that's smarter than most not everything if numbers cause this is not a controlled test and I'm sure he did not apply the same amount of pressure like he said. I'm starting my channel! But I'm into everything check me out and subscribe. I'll show it!!!

      about 6 days ago