Any feedback on R1 Concepts drilled / slotted rotors?
Oct 13, 2003 | 12:34 PM
#16
mayhem, an excellent read, good call.
Exhibit A:
Exhibit B:
Exhibit A:
Exhibit B:
from Jon A:
Yeah Pat, there are a few reasons that Porsche rotors are the exception to the rule:
1) The holes are cast in giving a dense boundary layer-type crystalline grain structure around the hole at the microscopic level as opposed to drilling which cuts holes in the existing grain pattern leaving open endgrains, etc, just begging for cracks.
2) The holes are only 1/2 the diameter of the holes in most drilled rotors. This reduces the stress concentration factor due to hole interaction which is a function (not linear) of hole diameters and the distance between them.
3) Since the holes are only 1/2 as big they remove only 1/4 as much surface area and mass from the rotor faces as a larger hole.
...
That's why Porsche rotors are the only "crossdrilled" rotors I would ever consider putting on my car.
...
BTW, the last time I saw a car at a PCA event with cracked rotors...it was a Ferrari. They use standard Brembo rotors drilled "the easy way."
Yeah Pat, there are a few reasons that Porsche rotors are the exception to the rule:
1) The holes are cast in giving a dense boundary layer-type crystalline grain structure around the hole at the microscopic level as opposed to drilling which cuts holes in the existing grain pattern leaving open endgrains, etc, just begging for cracks.
2) The holes are only 1/2 the diameter of the holes in most drilled rotors. This reduces the stress concentration factor due to hole interaction which is a function (not linear) of hole diameters and the distance between them.
3) Since the holes are only 1/2 as big they remove only 1/4 as much surface area and mass from the rotor faces as a larger hole.
...
That's why Porsche rotors are the only "crossdrilled" rotors I would ever consider putting on my car.
...
BTW, the last time I saw a car at a PCA event with cracked rotors...it was a Ferrari. They use standard Brembo rotors drilled "the easy way."
Oct 14, 2003 | 05:38 AM
#17
Evolving Member
Joined: May 2003
Posts: 113
Likes: 0
(raises hand) I'm the one responsible for that.
Matt (aka MaddMatt on Altimas.net)
Matt (aka MaddMatt on Altimas.net)
What's your handle on CC.com?
Oct 15, 2003 | 07:53 PM
#19
If they are quality, I think they will be a nice addition to the car. I have Stillen crossdrilled on my mx6 turbo and have no problems. Ther have been on for two years and I autocross this car all summer long and have done a couple track days (very hard on brakes). The rotors and the pads together have made my stopping power way better. I have not had any problems with my stock evo set yet but I wont be racing it on the track for quite a while. I will wait to see how all the new parts perform with others first.
Oct 16, 2003 | 05:22 AM
#20
Originally posted by HKSMX6GT
If they are quality, I think they will be a nice addition to the car. I have Stillen crossdrilled on my mx6 turbo and have no problems. Ther have been on for two years and I autocross this car all summer long and have done a couple track days (very hard on brakes). The rotors and the pads together have made my stopping power way better. I have not had any problems with my stock evo set yet but I wont be racing it on the track for quite a while. I will wait to see how all the new parts perform with others first.
If they are quality, I think they will be a nice addition to the car. I have Stillen crossdrilled on my mx6 turbo and have no problems. Ther have been on for two years and I autocross this car all summer long and have done a couple track days (very hard on brakes). The rotors and the pads together have made my stopping power way better. I have not had any problems with my stock evo set yet but I wont be racing it on the track for quite a while. I will wait to see how all the new parts perform with others first.
Did you read my previous posts?
Oct 20, 2003 | 11:55 AM
#22
Originally posted by HKSMX6GT
They are still stock sized rotors.
I read a little of the link and did not see it going anywhere, what was the big secret that I missed?
They are still stock sized rotors.
I read a little of the link and did not see it going anywhere, what was the big secret that I missed?
