Another cracking rotor thread.
Racer
Joined: May 2008
Posts: 470
Likes: 0
Nope. GTO: 5x120. Vette: 5x120.7. The studs will need to bend a little.
I'll need to shim the hubs 0.35mm to get the wheel snugged up well.
I didn't like the idea of bending the studs 0.3mm, then I discovered that
my "GTO fitment" CCW wheels are actually 5x120.7, 70.2mm bore! So
I've been running Corvette fitment for a year...
I'll need to shim the hubs 0.35mm to get the wheel snugged up well.
I didn't like the idea of bending the studs 0.3mm, then I discovered that
my "GTO fitment" CCW wheels are actually 5x120.7, 70.2mm bore! So
I've been running Corvette fitment for a year...
Drifting
Joined: Dec 2003
Posts: 1,895
Likes: 84
From: Darien IL
Sperkins: You might have a little more life in yours. Mine get pitched when they fracture thru. It has always happened while they are cooling off. I look for the the big cracks before going out and sometimes miss them, but your first hard stop will result in peddle vibration. Sometimes the vibration is subtle like a small fracture in a rear rotor and sometimes it feels like a big hunk of rotor is missing. In either case I write off the session and bring the car in for a rotor change.
I had new Chinese/BPI/Rockauto rotors on the car in October at Road America. I had lots of vibration beginning at the second or third lap, but could not find a crack and attributed vibration to DTC-70 pad material. My neighbor had the same vibration with new rotors and DTC-70 pads.
The scary part was that one of the fronts had a small fracture on the INSIDE surface at the I.D. where you could not see it on the car. I found this when switching to my street pads & rotors after the weekend.
Flink: I can't believe how bad your rotors look! I can't imagine getting more that one session out of those. Those are done.
I had new Chinese/BPI/Rockauto rotors on the car in October at Road America. I had lots of vibration beginning at the second or third lap, but could not find a crack and attributed vibration to DTC-70 pad material. My neighbor had the same vibration with new rotors and DTC-70 pads.
The scary part was that one of the fronts had a small fracture on the INSIDE surface at the I.D. where you could not see it on the car. I found this when switching to my street pads & rotors after the weekend.
Flink: I can't believe how bad your rotors look! I can't imagine getting more that one session out of those. Those are done.
Le Mans Master
Joined: Dec 2000
Posts: 9,919
Likes: 1,880
From: Hot Springs AR
SPerkins,
Best I could tell from your pics, you've got normal heat checks and still have some life in your rotors. Use Flinks' photos to find an upper limit to how long to run your rotors.
I've run heat-checked rotors for several seasons before the cracks grew to the point I could catch a fingernail on them, then I replaced them. Never did get a fatal crack in them, though.
HTH, and have a good one,
Mike
Best I could tell from your pics, you've got normal heat checks and still have some life in your rotors. Use Flinks' photos to find an upper limit to how long to run your rotors.
I've run heat-checked rotors for several seasons before the cracks grew to the point I could catch a fingernail on them, then I replaced them. Never did get a fatal crack in them, though.
HTH, and have a good one,
Mike
Pro
Joined: Apr 2004
Posts: 507
Likes: 6
From: Houston Tx
rotors
EEEEEEEEgads man, this rotor isn't safe to go around the block let alone stopping a 3500# car at speed!! Junk em, get cheap napa's or rockauto's, about $18 each! That's all I ran on my C5 with no prob's. I say that as I'm junking my whole Z-51 front rotors and going to smooth (smaller!) C5 rotors. Freakin' drilled rotors are for show only, let me repeat myself here, show only!!
Became aware in the middle of race track, (I remember exact spot),talking to my friend MArvin Brittenham from Denver, told how he end O'd his Mallett c5 coupe at 120ish when his rotor cracked, He had actually had felt "something" just before he went out. Now I'm careful on all rotors, and I'm really disappointed with the Z-51 rotors. (constant cracks) yup, bigger but nobody makes replacement smooth rotors. I'm doing fewer HPDE these days so cost is to prohibative to upgrade. chuck
Became aware in the middle of race track, (I remember exact spot),talking to my friend MArvin Brittenham from Denver, told how he end O'd his Mallett c5 coupe at 120ish when his rotor cracked, He had actually had felt "something" just before he went out. Now I'm careful on all rotors, and I'm really disappointed with the Z-51 rotors. (constant cracks) yup, bigger but nobody makes replacement smooth rotors. I'm doing fewer HPDE these days so cost is to prohibative to upgrade. chuck
Safety Car
Joined: May 2007
Posts: 4,812
Likes: 46
From: Taylorsville North Carolina
Here's a couple of pictures from my '03 ZO6. The RF rotor has some surface cracking, the worst being about a 1/2" long. The LF has some pretty serious heat spots, but no cracking. I'm still on the stock rotors with Carbotech pads (8/10). How bad can the cracks get before it's time to swap out the rotors? Sorry for the bad pics, but it's the best I can do with the POS camera I have.
