homemade rotors? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 01-30-2005, 06:26 PM   #1
Senior Member
True Car Nut
Thread Starter
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default homemade rotors?

can you make your own crossdrilled rotors? and slot them?
GAMEOVER is offline   Reply With Quote
Old 01-30-2005, 06:35 PM   #2
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

No, and no.

Drilling or slotting after the hardening process will only make the rotors fail early. And it'* usually very ugly. Don't sacrifice your rims, tires, and rotors, or possibly a hub.

Crossdrilled rotors are the worst thing you can do to brakes on a street car. These were intended for one-race events in off-street circuit cars. NASCAR throws these rotors away after one race.

Slotted rotors do have their benefits. But it'* important that they are slotted before hardening. Most are, because it'* ridiculously expensive and difficult to slot after hardening.

The ONLY exception on cross-drilling rotors are rotors that have the holes CAST into the blank before turning and hardening. It'* safer to stay away from cross-drilled rotors altogether. This is a SHOW mod. Nothing else.

Go standard or slotted, and don't modify your brake parts yourself in any way.
willwren is offline   Reply With Quote
Old 01-30-2005, 07:30 PM   #3
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

Yeah, i'd rather have poor brakes, than none at all.

I remember seeing a guy at a car show selling rotors and cross drilling them right in front of people! And people were buying them, too!


-justin
opensourceguy is offline   Reply With Quote
Old 01-30-2005, 07:34 PM   #4
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

Quote:
Originally Posted by opensourceguy
Yeah, i'd rather have poor brakes, than none at all.

I remember seeing a guy at a car show selling rotors and cross drilling them right in front of people! And people were buying them, too!


-justin
So a week or two later was there a rash of car accidents in the area???? lol
LakevilleSSEi is offline   Reply With Quote
Old 01-30-2005, 07:50 PM   #5
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

lol, probably. I was 9 at the time.. didn't really pay that much attention, but it does sit fresh in my mind [as does all other car shows I have been to].


-justin
opensourceguy is offline   Reply With Quote
Old 01-30-2005, 08:10 PM   #6
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Drilling? Those obviously WEREN'T hardened rotors.
willwren is offline   Reply With Quote
Old 01-30-2005, 08:21 PM   #7
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

I'm sure not.


-justin
opensourceguy is offline   Reply With Quote
Old 01-31-2005, 03:04 PM   #8
Senior Member
True Car Nut
Thread Starter
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

Quote:
Originally Posted by willwren
Drilling? Those obviously WEREN'T hardened rotors.
you can drill through anything will

remember i deal with metal everyday

with a carbide drill you can drill through hardened material
also there are different degrees of hardness
and process to make material more harder than others
GAMEOVER is offline   Reply With Quote
Old 01-31-2005, 03:20 PM   #9
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Quote:
Originally Posted by GAMEOVER
Quote:
Originally Posted by willwren
Drilling? Those obviously WEREN'T hardened rotors.
you can drill through anything will

remember i deal with metal everyday

with a carbide drill you can drill through hardened material
also there are different degrees of hardness
and process to make material more harder than others
Wire EDM is the preferred method of drilling or machining hardened materials, particularly when you get to the RC 58-60 range or harder in steels. However.......

Then you know all about stress cracks in hardened materials. You weaken the rotor by drilling after hardening, and even somewhat STILL if you drill before hardening. The holes need to be CAST into the blanks to prevent stress cracks (before hardening) to be suitable fore everyday street use, and still provide no real benefit to you other than looks, and decreasing the surface area 'bite' that the pads can achieve. Crossdrilling will in effect REDUCE your ability to brake.

Slotting, however, has proven benefits, and doesn't cause the stresscracking problem. Slots allow the pad to outgas, preventing a gas layer from being trapped in between the pad and rotor (imagine an air hockey table.....same effect). Slotting also allows water to escape, further improving wet braking, and allows pad friction material to be effectively removed from the rotor.
willwren is offline   Reply With Quote
Old 01-31-2005, 10:09 PM   #10
Senior Member
True Car Nut
Thread Starter
 
GAMEOVER's Avatar
 
Join Date: Aug 2003
Location: Racine Wi
Posts: 5,146
Thanks: 0
Thanked 0 Times in 0 Posts
GAMEOVER is on a distinguished road
Default

yeah your right
GAMEOVER is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
homemade air intake opensourceguy 1987-1991 8 06-04-2004 07:49 AM
Gratuitous engine shots, and homemade intake. J Wikoff Your Ride: GM Pictures & Videos 4 05-29-2004 01:36 PM
homemade intake opensourceguy 1987-1991 1 05-17-2004 10:15 PM
Homemade ScanTool PontiacDad Performance, Brainstorming & Tuning 4 10-06-2003 02:59 PM
What have you used for homemade CAI parts?? brminder Performance, Brainstorming & Tuning 9 04-10-2003 07:50 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:20 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.