rotor cracked!! need better set
Thread Starter
Pro
Joined: Jul 2008
Posts: 726
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From: Newport MN
rotor cracked!! need better set
Well the front driver rotor cracked the other day and it's time to buy a good set of rotors. I will be doing auto X and maybe a track day. I would like to get a pair for the fronts for under $500. What should I get. Thanks
If anyone has a pair they would like to sell. Let me know.
If anyone has a pair they would like to sell. Let me know.
Race Director
Joined: Dec 2000
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From: San Diego CA
I like these rotors:
http://www.tirerack.com/brakes/brake...1&autoModClar=
Recently, I worked for a company that made stainless steel rotors and got to study/analyze/design many types. I learned that:
a) Slotted are best, as many racing teams are using j-hook style slotted rotors.
b) Hawk's quiet slots are very similar in the amount of swept area that is slotted. The pads stay parallel to the rotor and hot spots are minimized.
c) While many people believe that slotted rotors accelerate pad wear, excessively, the rotors actually run cooler, which slows down pad wear.
http://www.tirerack.com/brakes/brake...1&autoModClar=
Recently, I worked for a company that made stainless steel rotors and got to study/analyze/design many types. I learned that:
a) Slotted are best, as many racing teams are using j-hook style slotted rotors.
b) Hawk's quiet slots are very similar in the amount of swept area that is slotted. The pads stay parallel to the rotor and hot spots are minimized.
c) While many people believe that slotted rotors accelerate pad wear, excessively, the rotors actually run cooler, which slows down pad wear.
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I've had good luck running my Baer Eradispeed rotors for the last 8 years. 
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I had very good luck with Baer Eradispeeds too, but I never did take them to the track so not sure how well they would hold up under those conditions.
Thread Starter
Pro
Joined: Jul 2008
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From: Newport MN
As you can see it cracked at the drilled hole. I think i am going to go with a slotted rotor only. No more holes.
And these had maybe 5k miles on them.
Last edited by amlarson2001; Apr 19, 2014 at 06:19 PM.
Race Director
Joined: Jan 2008
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From: oregon
use blanks, there's really no benefit to slotted with the compounds out today. they just cost more
not at all shocked to see a drilled rotor crack
how good the source iron is would be another concern. see if some company like brembo makes blanks for the c5
most low cost rotors all look to be recycled china iron. fine for the street but low carbon
not at all shocked to see a drilled rotor crack
how good the source iron is would be another concern. see if some company like brembo makes blanks for the c5
most low cost rotors all look to be recycled china iron. fine for the street but low carbon
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The high-end rotors with holes will have the holes cast in place as part of the casting operation. The holes only get a taper finish before the casting is machined.
Holes drilled in a casting will cause some weakening of the material around the drilled area. Extreme heat from braking such as during HPDE's or track days will cause cracking around those holes. Autocross is not as much as a problem but that depends on the speeds encountered at A-X events.
I have a C5 front brake conversion on my '87 and I just use regular stock replacement rotors for autocross and track use. Raybestos "Advanced Technology" rotors work very well for the use the car gets. They typically run $60 each. Part numbers: Right- 56700 and Left-56701
Regardless of the rotor type, it's a good idea to use some sort of ducting so the brakes can get as much cooling air as possible.
Holes drilled in a casting will cause some weakening of the material around the drilled area. Extreme heat from braking such as during HPDE's or track days will cause cracking around those holes. Autocross is not as much as a problem but that depends on the speeds encountered at A-X events.
I have a C5 front brake conversion on my '87 and I just use regular stock replacement rotors for autocross and track use. Raybestos "Advanced Technology" rotors work very well for the use the car gets. They typically run $60 each. Part numbers: Right- 56700 and Left-56701
Regardless of the rotor type, it's a good idea to use some sort of ducting so the brakes can get as much cooling air as possible.
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From: San Diego CA
Here is the most-often used style of racing brake rotor from AP Racing. This is the "J-hook" slot pattern I was referring to.
Fortunately, you do not need to spend megabucks for 2-piece rotors unless you are a serious racer (or if you have a C7).
Of course, there's a good reason slotted rotors are used more than any other - they outperform blank and drilled rotors.
Fortunately, you do not need to spend megabucks for 2-piece rotors unless you are a serious racer (or if you have a C7).
Of course, there's a good reason slotted rotors are used more than any other - they outperform blank and drilled rotors.
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Who is the manufacturer? This is a defect vs. normal wear and tear. I know my Eradispeeds have a lifetime warranty, however I've never tracked my C5 either.
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From: oregon
Le Mans Master
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From: Phoenix Arizona
use blanks, there's really no benefit to slotted with the compounds out today. they just cost more
not at all shocked to see a drilled rotor crack
how good the source iron is would be another concern. see if some company like brembo makes blanks for the c5
most low cost rotors all look to be recycled china iron. fine for the street but low carbon
not at all shocked to see a drilled rotor crack
how good the source iron is would be another concern. see if some company like brembo makes blanks for the c5
most low cost rotors all look to be recycled china iron. fine for the street but low carbon
Thread Starter
Pro
Joined: Jul 2008
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From: Newport MN
I have seen other threads of people with the same brakes having the same problem.
Race Director
Joined: Dec 2000
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From: San Diego CA
Most, if not all rotor manufacturers are reluctant to give up data that they've spent lots of time and money accumulating. You need to talk to the folks at AP Racing and the team leaders of factory racing teams, like the C6R team. Ask them why they consistently choose slotted rotors over blank rotors. In fact, talk to the guys who selected slotted rotors for the ACR Viper and C7.
Race Director
Joined: Jan 2008
Posts: 16,028
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From: oregon
Most, if not all rotor manufacturers are reluctant to give up data that they've spent lots of time and money accumulating. You need to talk to the folks at AP Racing and the team leaders of factory racing teams, like the C6R team. Ask them why they consistently choose slotted rotors over blank rotors. In fact, talk to the guys who selected slotted rotors for the ACR Viper and C7.
the less the metal is disturbed the more reliable it is. this is why blanks, made from high carbon iron tend to be the strongest of the "normal people" rotors
the slots are cosmetic thing and some very high temp pads may see a minor improvement due to gassing
street pads have no gassing problem