What do you guys think of these rotors?

[SLICKMAN]

These have dimples and slot, no holes to worry about cracking. What do you think?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2458626848&category=33564&sspagename=STRK%3AMEBWA%3AIT&rd=1
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[VETTEX2]

All Show And No Go..........................

 

[rsimoes]

I heard that they make a big difference, better than cross drilled, but they may not be able to be cut. Also, use the factory Z06 pads, if you don't mind extra brake dust and squeak, because they make a huge difference in the braking performance.

 

[VETTEX2]

I heard that they make a big difference, better than cross drilled

what kind of difference ?

Gassing is not a problem with modern pads..........slots and holes are like a cheese grater on your pads........

 

[SLICKMAN]

First time I heard anyone say that about this type of rotor..

:eyerole

what kind of difference ?
slots and holes are like a cheese grater on your pads........

 

[VETTEX2]

SORRY TO POP YOUR BUBBLE...........but....I stand by what I wrote .....they are all show and that's it from a functional standpoint.

 

[SLICKMAN]

I guess all the money porsche invested in these types of rotors on the race track as been a waste of money.

SORRY TO POP YOUR BUBBLE...........but....I stand by what I wrote .....they are all show and that's it from a functional standpoint.

 

[VETTEX2]

I guess all the money porsche invested in these types of rotors on the race track as been a waste of money.

lol........those rotors on ebay are stock castings that are machined.....POP !........PORSCHE ROTORS ARE CAST WITH THE HOLES ALREADY IN THEM AND ARE FOR LOOKS........POP ! Heavy cars use solid rotors for a reason....light cars have holes to reduce unsprung and reciprocating weight........you truly should have known.......POP ! DO SOME RESEARCH.....I BUILD RACE CARS THAT WIN CHAMPIONSHIPS..........POP !

 

[SLICKMAN]

We were talking about the technology, not the rotors on ebay. I can see talking to you is a waste of my time because what you know about brakes can fit in a thimble.

(email notification - off "click") - Later

 

[VETTEX2]

These have dimples and slot, no holes to worry about cracking. What do you think?

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2458626848&category=33564&sspagename=STRK%3AMEBWA%3AIT&rd=1
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YOU link to these specific rotors and then say you're not talking about them......weird........THEN you attack a championship winning carbuilder.......weirder........TIME FOR YOU TO CHECK YOURSELF.......The truth won't sway you because you must know it all......since you know it all , why did you inquire about those rotors ?


truly........buy a vowel......
I hope you don't strain yourself.........

 

[fhturner]

VETTEX2--

I think Slickman would probably respond better if you provided some additional details or info behind your statements in this thread. I know I would be more interested if you did. You're not saying a whole lot more than "They're crap," then giving us no further explanation. Can you tell us why? I've always heard/read that cross-drilling and/or slotting allows gases from hot brake pads to escape, thereby reducing or eliminating brake fade. You're saying this is no longer an issue? Then how come I hear about NASCAR drivers reporting their brake pedals are going all the way to the floor at Martinsville? Are the rotors on the C6 Z51 for show as well (cross-drilled)? Please provide us with more info to clear up the confusion.

Thanks,
Fred

 

[VETTEX2]

I thought I did........light cars use rotors that have holes cast in them to reduce unsprung , reciprocating weight...... Drilled rotors crack.......Gassing isn't a problem ....Nascar's pedal fade is from boiling the fluid.....not gassing.........hence the use of recirculators.......the rotors in his link on ebay are stock rotor castings with dimples and slots machined in them......they will warp just like a stock rotor......I agree with David Farmer and John Heinricy ( well known Corvette racers ) that those rotors are junk and basically are cheese graters on your pads..... I think they know more than most about vette brakes........my own experience also backs this up.........if he'd asked I would've provided more info.....but he knows it all .......lol............

 

[VETTEX2]

First time I heard anyone say that about this type of rotor..

:eyerole

maybe you out'a get out more.......:L

 

[rsimoes]

I was under the impression that they cooled better, therefore braked better. But from reading your responses, it seems that they don't.


So how can you keep the rotors from warping? Is there an aftermarket rotor that is better than factory, that is a direct bolt on?

Why are so many high performance rotors (Brembo, etc) drilled? Porsche, Mercedes, C6. . . doesn't seem right, I don't think MB is concerned about weight. . .besides, how much lighter could they be?

Thoughts?

 

[VETTEX2]

I was under the impression that they cooled better, therefore braked better. But from reading your responses, it seems that they don't.


So how can you keep the rotors from warping? Is there an aftermarket rotor that is better than factory, that is a direct bolt on?

Why are so many high performance rotors (Brembo, etc) drilled? Porsche, Mercedes, C6. . . doesn't seem right, I don't think MB is concerned about weight. . .besides, how much lighter could they be?

Thoughts?

You'd be surprised on how much weight you lose.......a couple of pounds and up.....this helps handling and acceleration......another thing.....holes look cool......a major factor........holes used to be functional, but are of little value nowadays.......as far as an aftermarket rotor ....any 2 piece rotor will be an upgrade worth doing.....stock rotors usually warp because they get hot and are not cooled down properly, such as a hard stop, to a stop and holding the pedal down, then sit there without airflowfor, example a panic stop and sitting at a light......when racing , after extreme use , the drivers drive the car and cool the brakes....some have fans in the ducting to do this .......Brembo rotors are cast with holes, not drilled , but are usually called cross-drilled.....why?.....dunno......

 

[JR_Vette]

I have to agree 100% with VetteX2. Anybody who has ever *really* raced, knows that cross-drilled rotors crack under high heat. It's a fact, and something that all manufacturers will state up front when you buy them. Even solid rotors will crack under high heat. My brother races in SCCA T2 and regularly has to replace his stock rotors for new ones because they tend to crack. It's just a fact of racing.

As for the C6 with the cross-drilled rotors, yes, I would be willing to bet it was totally for looks and will not be on any production car.

 

[Zixxer]

I'll confess at first I was thinking...hmmm, why wouldn't cross drilled rotors be better, I have them on my sport bike (ZX-12r) so clearly there's a reason, MotoGP uses them.....and so I started looking, sure enough, you're are correct but it looks like slotting helps...they also answered my question on why my motorcycle has them. I don't feel so bad that I just had HD solid rotors put on my Vette, I couldn't afford to go the show and no go route

Pulled this from another forum, and there were others that made the exact claims. Thanks for making me at least question and research a little more.

***********************************************************
Crossdrilling your rotors might look neat, but what is it really doing for you? Well, unless your car is using brake pads from the 40's and 50's, not a whole lot. Rotors were first `drilled' because early brake pad materials gave off gasses when heated to racing temperatures - a process known as `gassing out'. These gasses then formed a thin layer between the brake pad face and the rotor, acting as a lubricant and effectively lowering the coefficient of friction. The holes were implemented to give the gasses `somewhere to go'. It was an effective solution, but today's friction materials do not exhibit the same gassing out phenomenon as the early pads.

For this reason, the holes have carried over more as a design feature than a performance feature. Contrary to popular belief they don't lower temperatures (in fact, by removing weight from the rotor, the temperatures can actually increase a little), they create stress risers allowing the rotor to crack sooner, and make a mess of brake pads - sort of like a cheese grater rubbing against them at every stop. (Want more evidence? Look at NASCAR or F1. You would think that if drilling holes in the rotor was the hot ticket, these teams would be doing it.)

The one glaring exception here is in the rare situation where the rotors are so oversized (look at any performance motorcycle or lighter formula car) that the rotors are drilled like Swiss cheese. While the issues of stress risers and brake pad wear are still present, drilling is used to reduce the mass of the parts in spite of these concerns. Remember - nothing comes for free. If these teams switched to non-drilled rotors, they would see lower operating temperatures and longer brake pad life - at the expense of higher weight. It's all about trade-offs.

Slotting

Slotting rotors, on the other hand, might be a consideration if your sanctioning body allows for it. Cutting thin slots across the face of the rotor can actually help to clean the face of the brake pads over time, helping to reduce the `glazing' often found during high-speed use which can lower the coefficient of friction. While there may still be a small concern over creating stress risers in the face of the rotor, if the slots are shallow and cut properly, the trade-off appears to be worth the risk. (Have you looked at a NASCAR rotor lately?)

 

[grapeknutz]

Those look like rotors from www.irotors.com

 

[VETTEX2]

glad the enlightened finally showed up