1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Cross Drilled vs. Slotted which is better???

Discussion in 'Wheels / Suspension / Tires / Brakes' started by Bl6CRX, Dec 20, 2003.

  1. Bl6CRX

    Bl6CRX Senior Member

    Messages:
    1,553
    Likes Received:
    0
    Joined:
    Jul 14, 2003
    Location:
    UCLA
    i think the topic make its clear, which is better as far as rotors go, cross drilled or slotted, or what are the pro's/cons of each???
     
  2. NoJokE

    NoJokE Senior Member

    Messages:
    1,317
    Likes Received:
    0
    Joined:
    Jan 6, 2003
    Blanks are the best. More surface area with which to stop with.

    BUT if you are set on getting one or the other of these, go with slotted, less material removed then cross drilled.

    Cross drilling weakens the rotor and provides far less stopping power then blanks and less then slotted.
     
  3. preluderjs

    preluderjs Senior Member

    Messages:
    701
    Likes Received:
    0
    Joined:
    Oct 3, 2002
    Location:
    san diego
  4. Bl6CRX

    Bl6CRX Senior Member

    Messages:
    1,553
    Likes Received:
    0
    Joined:
    Jul 14, 2003
    Location:
    UCLA
    yeah, i was actually looking around and i decided that i don't want either, i just saw a set on ebay for cheap as hell, but now after a little more info, i see its a waste
     
  5. Bl6CRX

    Bl6CRX Senior Member

    Messages:
    1,553
    Likes Received:
    0
    Joined:
    Jul 14, 2003
    Location:
    UCLA

    p.s thanks for the link, i kinda gave up on the search system cause it never seemed to be working for me, yeah just confirmed what i read on ht...
     
  6. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

    Messages:
    30,036
    Likes Received:
    3,970
    Joined:
    Sep 28, 2002
    Location:
    CT
    :) nice to see all my effort pays off some times :)
     
  7. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    54
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home

    :worthy:
     
  8. UDT

    UDT Senior Member

    Messages:
    2,015
    Likes Received:
    0
    Joined:
    Sep 24, 2003
    Location:
    california
    i think the idea about cross drilled and slotted has to do with heat and needing to get rid of it.......if you know what i mean, kinda like heat sink on an amp
     
  9. K2e2vin

    K2e2vin Senior Member

    Messages:
    8,446
    Likes Received:
    92
    Joined:
    Jan 2, 2003
    Location:
    Raleigh, NC
    my auto tech teacher told me the drilled rotors are for drag racers and actually intentionally reduce contact area to reduce chance of wheel lock from high speed breaking, and are not for cooling(that is what the vents are for).
    im guessing slotted rotors are so the pads will bite gradually and not all at once, or something of that nature.
     
  10. MXDesa

    MXDesa Senior Member

    Messages:
    927
    Likes Received:
    2
    Joined:
    Apr 19, 2003
    Location:
    Queens, New York

    Your correct but that surface area also creates more heat and makes it harder to get rid of the gases that build up from over heating. Cross-Drilled and/or slotted rotors can give u better stopping power because they remain cooler. If there were useless and a waste of money, ferrari and porsche wouldn't use them on all there cars. But make sure u get a quality rotor
     
  11. NoJokE

    NoJokE Senior Member

    Messages:
    1,317
    Likes Received:
    0
    Joined:
    Jan 6, 2003

    You are right too, to a certain extent. Ferrari and Porsche use them because 1) At 180+ miles an hour heat DOES build up very quickly(your Honda isnt gonna see 180 on the street), 2) they also have 13+ inch rotors and 4 pot calipers, so what they lose in surface area they make up by having huge rotors and excellent clamping.

    So for a street Honda, get some blanks, unless you do some hardcore road course and/or endurance events.
     
  12. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

    Messages:
    30,036
    Likes Received:
    3,970
    Joined:
    Sep 28, 2002
    Location:
    CT

    :no:

    cross drilling is for weight reduction


    slotting is to shave off any glazing from the surface of the pad





    once again...
    drag racers are all about weight reduction...
    lighter rotors = less rotational mass = faster acceleration = better times

    slotted rotors are for eliminateing glazing of the pads





    dont want gasses building up under hard braking???? dont get shity pads
    GOOD pads will not gas out on you
    cross drilling is about weight reduction... porsche and ferrari use them because they are using HUGE ass rotors (13 inches or bigger) if those were solid they would be heavy as fuck




    its not about heat its about weight
    but you are correct the size of their rotors more than makes up for the loss in surface area
     
  13. NoJokE

    NoJokE Senior Member

    Messages:
    1,317
    Likes Received:
    0
    Joined:
    Jan 6, 2003

    It IS partly because of heat, it does let it vent better(this is only beneficial when you are racing for extended periods of time, again NOT for a street Honda). Most aftermarket pads have heat ranges, and if you are running cooler then what their heat range is, your braking are gonna feel like shit. If it didnt have to about heat, blank rotors wouldnt have the slots in between both of the sides. Cross drilling is for both weight AND heat.
     
  14. K2e2vin

    K2e2vin Senior Member

    Messages:
    8,446
    Likes Received:
    92
    Joined:
    Jan 2, 2003
    Location:
    Raleigh, NC

    if you think about the vents and the location of the holes then you would see air wouldnt really circulate through the holes; still comes in from inside and comes out on outside.
     
  15. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    54
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home
    e_solsi on brakes > you on brakes.

    that is all :)
     
  16. noobvang

    noobvang Senior Member

    Messages:
    382
    Likes Received:
    0
    Joined:
    Apr 30, 2003
    Location:
    Twincities, MN
  17. 89_starter

    89_starter Member

    Messages:
    58
    Likes Received:
    0
    Joined:
    Sep 30, 2003
    Cross drilled reduce water fade, slotted reduced gas fade. Slotted are best for a daily driver.
     
  18. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

    Messages:
    30,036
    Likes Received:
    3,970
    Joined:
    Sep 28, 2002
    Location:
    CT
    did you even bother reading anything that was already said in this post?????
     
  19. Loco Honkey

    Loco Honkey Banned

    Messages:
    3,646
    Likes Received:
    0
    Joined:
    Jun 5, 2003
    Why the hell are any of you talking about outgassing? Todays carbon metallic pads contain NO organic material, therefore producing NO gas. Cross drilled rotors are a byproduct of '30's technology when brake pads and shoes were made out of leather. Cross drilled rotors crack. Slotted rotors wear pads. Proper bedding and pad selection will eliminate glazing. The reason Porsche and Ferrari use them is hype. Everyone, including everyone in this thread, thinks that cross drilled rotors = high performance. That's total and utter bullshit.

    1) Cross drilled rotors have less swept area.

    2) Cross drilled rotors have less surface area to absorb heat.

    3) Cross drilled rotors have less mass to dissipate heat.

    4) Cross drilled rotors crack and break (seen it twice at open track days).
     
  20. 89_starter

    89_starter Member

    Messages:
    58
    Likes Received:
    0
    Joined:
    Sep 30, 2003

    :sleep: HOLD ON! THATS IMPOSIBLE to not have any gas when friction and heat is preasent. Not every brake pad is carbon metallic. I think my instructor and An A.S.E book would just make up stuff. GAS FADE is when a very small "pocket" forms between the friction material and the rotor.THat is why slotted rotors are directional. to basicaly fan the gas away. thats why some tires are directional because if you reverse the the will suck in water instead of tread ther water out. WATER FADE is the the same only with water.
    The main brins of brakes is to create heat. THAT IS HOW THEY WORK! FRICTION=HEAT and FRICTION MEANS STOPPING. AS A MATTER OF FACT MY INSTRUCTOR TELLS ME THAT DIPPLED ROTORS ARE THE BEST, lESS FADE, MORE SURFACE AREA.
     
Verification:
Draft saved Draft deleted

Share This Page