Poll: Brake upgrades..what kind of ratio?, F=big/R= big or F=big/R=little or ??? |
|
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. |
|
Poll: Brake upgrades..what kind of ratio?, F=big/R= big or F=big/R=little or ??? |
Mueller |
Feb 3 2005, 07:27 PM
Post
#1
|
914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
okay...for a factory 914 /4, the front calipers (piston area wise) are 1.61 larger than the rear....(42mm and 33mm)
for early 911's (up to '84), the fronts are 1.6 larger from '84 to '89, the fronts are only 1.3 times larger than the rears....then the ratios vary from 1.4 to 1.7 until the arrival of the 1st Twin-turbo, that car has calipers that have piston areas 2X the size of the rears !!!!! I'm just wondering what combo people have successfully ran.....it's interesting to note that the standard Boxster front calipers if bolted to the front of a 911, the Boxster piston area is only 1.05 larger than the standard 911 fronts.....seems like a darn near equal swap, except for the bigger pads you get with the Boxster calipers (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) |
lapuwali |
Feb 16 2005, 05:59 PM
Post
#2
|
||
Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
Never heard of that. Can't think of any reason for improved "efficiency" (whatever that's supposed to mean) with more than one pad per side. I've seen such arrangements, and the best story I heard was it allows you to compensate for the unequal wear between the leading and trailing edges of one large pad by simply replacing one of N smaller pads, all of which are the same. On some early 6 or even 8 piston calipers, I've seen setups with a small round pad per piston. Another way I've seen to attempt to solve this is to stagger the size of the pistons so the leading edge pistons are smaller, and thus exert less force than the trailing edge pistons. I've seen two-piston slider type (pistons on the same side with a slider "claw" on the other), four-piston, and six-piston calipers made this way. One saw this a lot on bikes a few years ago, and may still today for all I know. Still one pad per side, but presumably it didn't taper so much, and wore more evenly. Perhaps it's "cost" efficiency? Replace only the rapidly wearing leading edge pads, not the whole pair of (presumably tapered) pads? |
||
Lo-Fi Version | Time is now: 8th June 2024 - 12:55 AM |
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 ... |