Cross drilled Rotors?

M3Monsta · 05-20-2011, 05:30 PM

Just a quick question, what is the difference between normal rotors and cross drilled? (Physical difference) And what are the differences in performance (if there are any)

Also, is there a big price jump?

Thanks.

OrientBlau · 05-20-2011, 05:34 PM

There's blank (standard), drilled and slotted.

Blanks work the best. Period.

Blank:

Drilled:

Slotted:

dan_1337 · 05-20-2011, 05:36 PM

Quote:

Originally Posted by M3Monsta

what is the difference between normal rotors and cross drilled? (Physical difference)

One has holes drilled through them, one is a solid piece of steel.

Quote:

Originally Posted by M3Monsta

what are the differences in performance (if there are any)

From what I've seen, braking distance isn't decreased but the rotor can run cooler as it has more vents than the standard vented rotor.

Quote:

Originally Posted by M3Monsta

Also, is there a big price jump?

Yes and no. Depends on brand, model, etc.

Andy2108 · 05-20-2011, 05:40 PM

Quote:

Originally Posted by OrientBlau

There's blank (standard), drilled and slotted.

Blanks work the best. Period.

true, but they look so damn good

blank - best, reason they are stock

slotted - faster cooling, slightly less surface area than blanks

drilled - less surface area than blank's. faster to warm up and faster to cool down. possibility to crack with crazy heat on the track after alot of abuse

and they just look sooo much cooler

grandcarrera · 05-20-2011, 05:43 PM

So you say that I should get normal oem rotor over oem performance rotor ?

El Polo · 05-20-2011, 05:45 PM

^those are cast perforated rotors if I'm not mistaken. They don't have the weakness of cross drilled ones by design.

Andy2108 · 05-20-2011, 05:47 PM

the OEM performance ones are cast perforated?

El Polo · 05-20-2011, 05:49 PM

Quote:

Originally Posted by Andy2108

the OEM performance ones are cast perforated?

I was replying to your message with the picture of the Brembo kit. No idea about OEM perf ones

Andy2108 · 05-20-2011, 05:51 PM

Quote:

Originally Posted by El Polo

I was replying to your message with the picture of the Brembo kit. No idea about OEM perf ones

That picture was for drool references only.

OrientBlau · 05-20-2011, 05:52 PM

Agreed. Drilled does look much better.

El Polo · 05-20-2011, 05:54 PM

Zimmermann products seems to be cast perforated (even if vendors advertise them as cross-drilled... marketing...)

3MPOWERED · 05-20-2011, 06:04 PM

Slotted or not slotted are best. The cross drilled rotors have been known to crack between the holes and eventually grenade regardless of brand. I've seen Dba rotors go boom.

M3Monsta · 05-20-2011, 06:34 PM

Well im not planning on going to the track, just a couple street races here and there.

The drilled looks NICE though.

BMWespresso · 05-20-2011, 07:06 PM

drilled, the best performer, never going back

no cracks

OrientBlau · 05-20-2011, 07:13 PM

Quote:

Originally Posted by BMWespresso

drilled, the best performer, never going back

no cracks

Drilled is NOT the best performer.

OrientBlau · 05-20-2011, 07:23 PM

What to expect with drilled:

flashmeow · 05-20-2011, 07:50 PM

you only get cracks from low quality crossed drill. I forgot which one is better (cast vs drilled).

3MPOWERED · 05-20-2011, 08:17 PM

Quote:

Originally Posted by OrientBlau

Drilled is NOT the best performer.

This has been proven. It is not limited to less expensive brands either. Like I said, I've seen dba rotors do it too.

theOSUbob · 05-20-2011, 08:37 PM

I don't think having cross-drilled (or perforated) rotors fail is a COMMON problem. I mean, let's be honest, just about every single high-performance car comes with them standard.

flashmeow · 05-20-2011, 08:39 PM

Quote:

Originally Posted by theOSUbob

I don't think having cross-drilled (or perforated) rotors fail is a COMMON problem. I mean, let's be honest, just about every single high-performance car comes with them standard.

word x1000

it is all about how the rotors are made.

05-20-2011, 05:30 PM	#1
M3Monsta Registered User Join Date: May 2011 Location: Canada Posts: 35 My Ride: Nada View My Garage	Cross drilled Rotors? Just a quick question, what is the difference between normal rotors and cross drilled? (Physical difference) And what are the differences in performance (if there are any) Also, is there a big price jump? Thanks. __________________

05-20-2011, 05:34 PM	#2
OrientBlau Registered User Join Date: Jul 2010 Location: NYC Posts: 2,453 My Ride: 2003 330i View My Garage	There's blank (standard), drilled and slotted. Blanks work the best. Period. Blank: Drilled: Slotted: __________________ All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident. - Arthur Schopenhauer Last edited by OrientBlau; 05-20-2011 at 05:36 PM.

05-20-2011, 05:47 PM	#7
Andy2108 Registered User Join Date: Nov 2009 Location: U.S.A. Posts: 7,808 My Ride: E46M3E92M3'67Cobra View My Garage	the OEM performance ones are cast perforated? __________________ De gustibus non est disputandum.

05-20-2011, 05:52 PM	#10
OrientBlau Registered User Join Date: Jul 2010 Location: NYC Posts: 2,453 My Ride: 2003 330i View My Garage	Agreed. Drilled does look much better. __________________ All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident. - Arthur Schopenhauer

05-20-2011, 06:04 PM	#12
3MPOWERED Registered User Join Date: Mar 2011 Location: Colorado Posts: 178 My Ride: E46 M3 View My Garage	Slotted or not slotted are best. The cross drilled rotors have been known to crack between the holes and eventually grenade regardless of brand. I've seen Dba rotors go boom. __________________ Removed - Tim330i

05-20-2011, 05:43 PM	#5
grandcarrera Registered User Join Date: Nov 2010 Location: spokane washington Posts: 497 My Ride: 330xi 2003 View My Garage	So you say that I should get normal oem rotor over oem performance rotor ?

05-20-2011, 05:45 PM	#6
El Polo Registered User Join Date: Feb 2010 Location: Canada Posts: 451 My Ride: 99 black 328i View My Garage	^those are cast perforated rotors if I'm not mistaken. They don't have the weakness of cross drilled ones by design.

05-20-2011, 05:54 PM	#11
El Polo Registered User Join Date: Feb 2010 Location: Canada Posts: 451 My Ride: 99 black 328i View My Garage	Zimmermann products seems to be cast perforated (even if vendors advertise them as cross-drilled... marketing...)

05-20-2011, 06:34 PM	#13
M3Monsta Registered User Join Date: May 2011 Location: Canada Posts: 35 My Ride: Nada View My Garage	Well im not planning on going to the track, just a couple street races here and there. The drilled looks NICE though. __________________

05-20-2011, 07:06 PM	#14
BMWespresso Registered User Join Date: Aug 2008 Location: Miami Posts: 1,499 My Ride: 2005 325CI View My Garage	drilled, the best performer, never going back no cracks Attached Thumbnails __________________ Last edited by BMWespresso; 05-20-2011 at 07:07 PM.

05-20-2011, 07:23 PM	#16
OrientBlau Registered User Join Date: Jul 2010 Location: NYC Posts: 2,453 My Ride: 2003 330i View My Garage	What to expect with drilled: __________________ All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident. - Arthur Schopenhauer

05-20-2011, 07:50 PM	#17
flashmeow Banned User Join Date: Apr 2008 Location: Dallas, TX Posts: 2,222 My Ride: E30-E46-E90-E90M-F30 View My Garage	you only get cracks from low quality crossed drill. I forgot which one is better (cast vs drilled).

05-20-2011, 08:37 PM	#19
theOSUbob Registered User Join Date: Apr 2009 Location: Cleveland Posts: 340 My Ride: LeMans Blue E46 M3 View My Garage	I don't think having cross-drilled (or perforated) rotors fail is a COMMON problem. I mean, let's be honest, just about every single high-performance car comes with them standard.

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