Cross-Drilled Rotors

[sLADe781]

So my brakes have been squeaking recently and I'm probably gonna be changing them in the near future. While I'm down there, I might as well just change the rotors as well since I was planning on doing it in the future anyways. So yeah, you guys have any ideas on what type/brand of cross-drilled rotors I should get? Thanks in advance.

[Hotshot8792]

Originally Posted by sLADe781

So my brakes have been squeaking recently and I'm probably gonna be changing them in the near future. While I'm down there, I might as well just change the rotors as well since I was planning on doing it in the future anyways. So yeah, you guys have any ideas on what type/brand of cross-drilled rotors I should get? Thanks in advance.

well the thing about cross drilled are if you don't get a really good brand like stillen (which is going to cost more money) then you'll be prone to cracking in a year or so. Personally I prefer powerslot rotors and is probably what I am going to get eventually.

[sLADe781]

^^Whoa, so like it's gonna cost me anywhere from $400 to $500 to get a set of 4, huh? Didn't think it was gonna be that expensive... LOL

Anyways, so I see the Stillen ones on 3sx that are cross-drilled but the Powerslot ones on Summit Racing are not....what's the difference between the 2? And which one's better?

[planet_keeper]

i saw a set of drilled and slotted rotors on ebay for $300. i checked the guy out and hes been selling them for like 2 years with over 500 transactions and 100% positive feedback. its worth checking out: http://cgi.ebay.com/ebaymotors/3000G...08976675QQrdZ1

they look real nice imo. i always take ebay with a grain of salt but his feedback is awesome.

[Hotshot8792]

Originally Posted by sLADe781

^^Whoa, so like it's gonna cost me anywhere from $400 to $500 to get a set of 4, huh? Didn't think it was gonna be that expensive... LOL

Anyways, so I see the Stillen ones on 3sx that are cross-drilled but the Powerslot ones on Summit Racing are not....what's the difference between the 2? And which one's better?

cross drilled rotors have holes in them. powerslot rotors have slots in them that run from the inside part of the circle to the outside. The reason why I like the powerslot rotors because the cheaper cross drilled rotors just have holes drilled in them and after time, they have a tendency to crack. The more expensive cross drilled rotors generally are formed with the holes in them so they do not have a tendency to crack. The powerslot rotors don't have any holes in them so they can't crack at the holes.

Go look at some of the cars with cross-drilled on 3SI, and you'll see what i'm talking about on the cracking issue. I have seen pictures of them before.

[Polygon]

Don't waste your time or you money on crossdrilling. It is a worthless marketing scheme to steal your money. There was a time, long ago, when it did something but not anymore. If you want I can elaborate.

If you're going to get anything get slotted rotors. They help with initial bite but they will eat pads pretty quick. I would suggest getting some good vented blanks with cooling vanes and some good pads.

[sLADe781]

^^Polygon, yes, please elaborate a bit more...thanks...

[AutostradaVR4]

has to do with old brake pad composition. When they got hot, they expelled gas, and reduced friction with the rotor. holes were designed to let the gas escape from between the pad and rotor.

no longer a problem since they changed the composition of brake pads.

[Polygon]

Originally Posted by BlinkRA182

has to do with old brake pad composition. When they got hot, they expelled gas, and reduced friction with the rotor. holes were designed to let the gas escape from between the pad and rotor.

no longer a problem since they changed the composition of brake pads.

Exactly, it is a pad problem, not a rotor problem. If you are experiencing outgassing then you have crappy pads and should get a good set. As for the rest of my elaboration, here you go:

There are a lot of problems with crossdrilled rotors. They are simply a marketing ploy to get your money. The fact is that you will NOT see any race car with crossdrilled rotors. Here are the problems:

1. They tend to crack. This is more of a problem with rotors that were drilled after being cast than rotors that were cast crossdrilled. However, they are BOTH prone to cracking.

2. Since you have removed material from the rotor you have reduced it's effectiveness to stop. The rotor is designed to absorb heat. Removing that material means that the rotor will now be able to hold less heat. This means that it will be more quickly absorbed by your caliper and more importantly your brake fluid. This will cause your brake fluid to boil and that causes brake fade.

3. Also, since you've removed material from the rotor you have also reduced the contact patch between the rotor and the pad. This may not seem like much but compare it to a set of tires and the fact that the more tire you have touching the road the more grip you have.

The fact of the matter is that if you want to improve braking get bigger rotors (blanks), some good pads, braided flex lines, and some good fluid. I guess if you must have crossdrilled rotors then at least make sure to get bigger than stock rotors so that you don't lose braking performance.

[DSM Monster]

question for u then polygon. is it pretty much the same deal as just slotted rotors too?

[Igovert500]

#3 still applies to slotted rotors. #1 not really. #2, I've seen argued both ways...you remove more material, but you open up more surface area...so it can be argued both ways.

Regardless, Polygon is absolutely right, get good blank vented rotors.

[BeZerK2112]

Blanks are the way to go. Save your money and get them. Also be careful of the ebay deals that you can get. They are not always what they seam. If you want to make sure you are getting the real deal, often times you have to go to a shop of some sort, so you dont get a knock off. But you can find the real deal on the internet. Just a caution.

[sLADe781]

So umm....are these any good? http://store.summitracing.com/partde...5&autoview=sku

[Hotshot8792]

Originally Posted by sLADe781

So umm....are these any good? http://store.summitracing.com/partde...5&autoview=sku

those are powerslotted

if your going to look into just plain vented ones, i'm not sure where to look off the top of my head. You can always try tirerack.

[Polygon]

Originally Posted by sLADe781

So umm....are these any good? http://store.summitracing.com/partde...5&autoview=sku

To answer your question, they are good if you don't mind paying $200 for your front rotors. Just remember they will also eat through pads faster if that is a problem for you.

If you want I can find you some options for some good blanks, but those Powerslot rotors are good.