Please don't buy drilled rotors!!!
#1676925
09/25/14 08:39 PM
09/25/14 08:39 PM
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Joined: Jun 2007
Posts: 2,432 NorCal
RylisPro
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Just a public service announcement! If you are going to buy Doctor Diff's or any serious brake kit, please get the NON-DRILLED rotor option. Its free and the rotor has more material to effectively act as a heat sink. Many people just don't understand that unless cast with holes, drilled rotors are just going to crack faster at higher temps reference: Trouble Shooting Brake Procedures #5. Why do brake rotors crack? http://www.ctbrakes.com/faqs.aspThanks for the rotors Cass! Hopefully the Fedex guys that lost the 4th one stub their toe on it
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Re: Please don't buy drilled rotors!!!
[Re: Dan@Hotchkis]
#1676928
09/25/14 11:15 PM
09/25/14 11:15 PM
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Joined: May 2005
Posts: 723 Houston Tx
Uhcoog1
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Did you kill a set of rotors at your first track day?
Nice rotors!
-'02 Dodge Viper Ex-World Challenge racecar -'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: Please don't buy drilled rotors!!!
[Re: Uhcoog1]
#1676929
09/25/14 11:25 PM
09/25/14 11:25 PM
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Joined: Jun 2007
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RylisPro
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Nope not at all! I just wanted to get an extra set of spares. Problem is that Cass stocks mostly drilled rotors because that's what the general public thinks "looks cool" but they don't usually know that "they crack". F'ing Fedex lost one though but Cass will send me another
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Re: Please don't buy drilled rotors!!!
[Re: Uhcoog1]
#1676930
09/25/14 11:32 PM
09/25/14 11:32 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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Are those rear rotors for his big rear kit?
Mopar to the bone!!!
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Re: Please don't buy drilled rotors!!!
[Re: RylisPro]
#1676934
09/26/14 02:35 PM
09/26/14 02:35 PM
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Joined: Jan 2009
Posts: 813 Ontario,Canada
brads70
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It depends on the quality of the material the rotor is made with. I've seen hundreds of circle track rotors glowing orange that are drilled and they endure pretty good. I will say usually you do get what you pay for, the cheap ones do crack very soon. I agree though ebay rotors are not usually made of good material ( Chinese) and not generally a good idea on the street. I bought mine from here http://www.r1concepts.com/Premium series drilled and slotted been fine for almost 5 years now.
Last edited by brads70; 09/26/14 03:29 PM.
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Re: Please don't buy drilled rotors!!!
[Re: Dan@Hotchkis]
#1676935
09/27/14 03:46 AM
09/27/14 03:46 AM
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Joined: Sep 2005
Posts: 6,516 Santa Cruz, California
Lefty
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Quote:
I agree, drilled rotor are not for the street. Showed a guy at cars and coffee how his ebay drilled rotors were cracking from hole to hole. Scary.
That's why you should never buy cheap Chinese rotors off eBag. You get what you deserve cheaping out on rotors. There have been thousands of good drilled rotors raced for decades with great results. The good rotors have the holes counter sunk drilled to relieve the sharp edges which reduces the cracks.The iron used is important as well. Solid rotors crack too. You can see little cracks on most any type of rotor that's been heated red hot and then squeezed hard during a race. The later slotted rotors will have cracks as well after a race. Wilwood would not sell drilled rotors if they were no good. I've never had a pad glaze up on a drilled or slotted rotor, solid rotors glaze up much easier because the lack of pad surface "wiping" that takes place due to the holes or slots. The pads don't last as long, but if you're worried about pad life this is the wrong forum.
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Re: Please don't buy drilled rotors!!!
[Re: feets]
#1676937
09/27/14 10:00 AM
09/27/14 10:00 AM
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Joined: Jun 2007
Posts: 2,432 NorCal
RylisPro
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This is exactly why I started this thread. Many rotors are cast like the ones in my first post and then drilled afterwards. It is why I specifically buy the non-drilled rotors Wilwood, Baer, and any other rotor manufacturer will sell the consumer public anything they want. If you want rotors with "cool looking holes" in them they will sell you those too. All I am saying is that I don't want them
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Re: Please don't buy drilled rotors!!!
[Re: jcc]
#1676941
09/30/14 10:15 PM
09/30/14 10:15 PM
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Joined: Mar 2014
Posts: 40 upper So. CA
ntsqd
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Lap times were longer due to needing to brake earlier because the cold pads weren't as effective. Drilled rotors tended to heat the pads up faster than undrilled. Wasn't a huge difference, had to really pay attention and an uber consistent driver is a must.
Last edited by ntsqd; 09/30/14 10:17 PM.
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Re: Please don't buy drilled rotors!!!
[Re: RylisPro]
#1676942
11/02/14 09:38 PM
11/02/14 09:38 PM
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Joined: Jun 2007
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RylisPro
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I recently got the missing brake rotor from Dr. Diff the other week. The front rotors from the Stage 4 kit I got have internal vanes that are vertical while these new rotors are curved The weird thing is they are both curved in the same direction! Kind of hard to see though cause I painted one hi-temp black I actually have 2 drivers side rotors! Cass emailed me back and said this was normal. It appears that OEMs often produce rotors like this even on their halo cars. Is it ideal? No, but I have no problems running like this because I doubt I'll get into high enough temps to max out my Carbotech XP12's On a side note, these suckers are heavy! They weigh more than my wheels!
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Re: Please don't buy drilled rotors!!!
[Re: RylisPro]
#1676943
11/03/14 07:37 PM
11/03/14 07:37 PM
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Joined: Jul 2003
Posts: 898 Georgia
72440CUDA
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Quote:
I recently got the missing brake rotor from Dr. Diff the other week. The front rotors from the Stage 4 kit I got have internal vanes that are vertical while these new rotors are curved The weird thing is they are both curved in the same direction! .... Is it ideal? No, but I have no problems running like this because I doubt I'll get into high enough temps to max out my...
I noticed the same thing with my kit. Vanes are same direction but drilled holes/slots are different... when they crack I'll switch them out to slotted. Car gets very few miles, so I can wait, not a show stopper.
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