Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> DISC BRAKES ???, Check this out
Quilmes
post Mar 2 2005, 06:54 PM
Post #1


Torino 380 W
**

Group: Members
Posts: 358
Joined: 26-January 05
From: Orlando, FL
Member No.: 3,510
Here is a photo of my old disc brakes that I ran on my 914 during a DE event in Sebring Short track. I was using Wilwood brakes, I noticed that the car started to lock up the right front tire. During the lunch brake I decide to pull of the wheels and see why. As you can see the rotors cracked all the way I was very lucky that day.
Now I run 930 brakes, and will change to sloted brakes.

Thanks


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
mattillac
post Mar 2 2005, 07:01 PM
Post #2


robots!
***

Group: Members
Posts: 536
Joined: 27-October 04
From: vallejo,ca
Member No.: 3,020
what kind of pads were chewing on those?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Series9
post Mar 2 2005, 07:03 PM
Post #3


Lesbians taste like chicken.
*****

Group: Members
Posts: 5,444
Joined: 22-August 04
From: DeLand, FL
Member No.: 2,602
Region Association: South East States
(IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)

No more drilled rotors for you. Porsche casts in the holes for this very reason.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
redshift
post Mar 2 2005, 07:04 PM
Post #4


Bless the Hell out of you!
**********

Group: Members
Posts: 10,926
Joined: 29-June 03
Member No.: 869
Oh look, complete disaster overted!


M
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BIGKAT_83
post Mar 2 2005, 07:04 PM
Post #5


Senior Member
***

Group: Members
Posts: 1,798
Joined: 25-January 03
From: Way down south Bogart,GA
Member No.: 194
Region Association: South East States
Are those wilwood rotors?

(IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cap'n Krusty
post Mar 2 2005, 07:52 PM
Post #6


Cap'n Krusty
**********

Group: Members
Posts: 10,794
Joined: 24-June 04
From: Santa Maria, CA
Member No.: 2,246
Region Association: Central California
One of the "features" of drilled rotors ................ The Cap'n
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BIGKAT_83
post Mar 2 2005, 08:43 PM
Post #7


Senior Member
***

Group: Members
Posts: 1,798
Joined: 25-January 03
From: Way down south Bogart,GA
Member No.: 194
Region Association: South East States
After looking those must be stock Porsche drilled rotors.

(IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
bondo
post Mar 2 2005, 08:55 PM
Post #8


Practicing my perpendicular parking
****

Group: Members
Posts: 4,277
Joined: 19-April 03
From: Los Osos, CA
Member No.: 587
Region Association: Central California
That's a disk "break"! (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TimT
post Mar 2 2005, 09:14 PM
Post #9


retired
****

Group: Members
Posts: 4,033
Joined: 18-February 03
From: Wantagh, NY
Member No.: 313
I dont think those are oem Porsche drilled rotors. The oem rotors have many more holes in them actually, and as mentioned earlier, the hole in the oem rotors are cast, not drilled.

ps I dont think those are wilwood rotors either, AFAIK wilwood doent make a rotor that bolts direct to the Porsche hub, a "hat " or adapter is needed

This post has been edited by TimT: Mar 2 2005, 09:15 PM
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Joe Bob
post Mar 2 2005, 09:17 PM
Post #10


Retired admin, banned a few times
***************

Group: Members
Posts: 17,427
Joined: 24-December 02
From: Boulder CO
Member No.: 5
Region Association: None
If you had been using braided stainless steel brake lines and/or blue RTV with those rotors...you would have surely died.... (IMG:http://www.914world.com/bbs2/html/emoticons/blink.gif)

The Captain...
>>>>>>>>>>.

Glad you didn't have a serious incident....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914GT
post Mar 2 2005, 10:35 PM
Post #11


Senior Member
***

Group: Members
Posts: 1,100
Joined: 11-October 04
From: Tucson
Member No.: 2,923
Region Association: Southwest Region
Interesting that the cracks all seem to propagate radially, between two holes aligned with the center of the hub. If they were drilled so that no holes 'overlap' maybe it wouldn't have cracked? We'll never know I guess.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Series9
post Mar 2 2005, 10:44 PM
Post #12


Lesbians taste like chicken.
*****

Group: Members
Posts: 5,444
Joined: 22-August 04
From: DeLand, FL
Member No.: 2,602
Region Association: South East States
These are Porsche rotors (996TT), but I don't know how many patterns they have.


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
TimT
post Mar 2 2005, 10:52 PM
Post #13


retired
****

Group: Members
Posts: 4,033
Joined: 18-February 03
From: Wantagh, NY
Member No.: 313
Those cracked rotors appear to be straight vane rotors also.. as opposed to curved vane rotors..

The cracks appear to propogate where two holes were drilled in one vane. It makes sense that a crack would appear in this instance.. the x-section of the rotor is least in these areas
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914GT
post Mar 2 2005, 10:52 PM
Post #14


Senior Member
***

Group: Members
Posts: 1,100
Joined: 11-October 04
From: Tucson
Member No.: 2,923
Region Association: Southwest Region
I'm not a mechanical or materials engineer, but my guess is that two holes drilled in the same vented section of the rotor induces stress cracking between the holes. Maybe if a maximum of 1 hole per section was drilled for each side there would be less chance of a problem.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Quilmes
post Mar 4 2005, 09:01 AM
Post #15


Torino 380 W
**

Group: Members
Posts: 358
Joined: 26-January 05
From: Orlando, FL
Member No.: 3,510
QUOTE (mikez @ Mar 2 2005, 07:17 PM)
If you had been using braided stainless steel brake lines and/or blue RTV with those rotors...you would have surely died.... (IMG:http://www.914world.com/bbs2/html/emoticons/blink.gif)

The Captain...
>>>>>>>>>>.

Glad you didn't have a serious incident....

Sorry for not getting back to your questions earlier, I posted this thread just before I left on my business trip, where today I finally have some time to respond.
The rotors were from Zimmerman, calipers where wildwood, I do not remember what pads I was running at that time. This has happened twice to me with this style brakes. I also have steel lines and ATE blue brake fluid, so yes I guess I was very lucky.
Then I ran a stock 911 rotor and did not have this problem, but I still was having brake flex from the 911 alum calipers.
I saved up some money and decide to buy 930 brakes all the way around, these work fine and look good and one can still fit a 15" Fuchs wheel that I run on the street.

Thanks
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rusty
post Mar 4 2005, 10:04 AM
Post #16


Wanted: Engine case GA003709
*****

Group: Admin
Posts: 7,941
Joined: 24-December 02
From: North Alabama
Member No.: 6
Region Association: Galt's Gulch
QUOTE (Quilmes @ Mar 2 2005, 07:54 PM)
Here is a photo of my old disc brakes that I ran on my 914 during a DE event in Sebring Short track. I was using Wilwood brakes, I noticed that the car started to lock up the right front tire. During the lunch brake I decide to pull of the wheels and see why. As you can see the rotors cracked all the way I was very lucky that day.
Now I run 930 brakes, and will change to sloted brakes.

Thanks

Interesting picture. How many track events / street miles do these discs have?

-Rusty (IMG:http://www.914world.com/bbs2/html/emoticons/smoke.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Quilmes
post Mar 4 2005, 11:17 AM
Post #17


Torino 380 W
**

Group: Members
Posts: 358
Joined: 26-January 05
From: Orlando, FL
Member No.: 3,510
Not that many, I think two events, and maybe 1500 street miles.

I had the same problem with the New Zimmerman rotors ones and I broke them in the correct way.
Even the 930 rotors after a few hard track events you will notice small cracks aroung the holes.
A lot of racer (24Hrs of Daytona, 12Hrs Sebring)used the drilled rotos for only one big race and buy new ones for the next event. I use my 914 for the street and track. I try to do as many PCA DE and Safemotor/NASA events I can, provided that I am not working or my wife lets me.

Thanks
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brando
post Mar 4 2005, 12:34 PM
Post #18


BUY MY SPARE KIDNEY!!!
****

Group: Members
Posts: 3,935
Joined: 29-August 04
From: Santa Ana, CA
Member No.: 2,648
Region Association: Southern California
Time to go with drilled ceramic composite rotors (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 4th May 2024 - 03:05 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...