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11.75" rotors and Wilwood calipers.
https://slantsix.org/forum/viewtopic.php?t=33092		 Page 2 of 2
Author:  MiDi [ Sun Jan 18, 2009 10:07 pm ]
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nice brakes josh, those smoke my pwr drums! nice wheels i like them very much.
Author:  andyf [ Mon Jan 19, 2009 8:06 am ]
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Be very careful about using rear disc brakes with those Wilwood front brakes. The piston size in the Wilwoods is fairly small so you need rear calipers with tiny pistons. If you just grab a random rear caliper you'll most likely end up with rear bias which is not what you want.

I see this problem all the time since some of the more popular rear disc conversions use calipers with large pistons in them. People bolt together kits from two different mfgs and end up with a mess.
Author:  Dart270 [ Mon Jan 19, 2009 8:29 am ]
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FWIW, the TSMMFG.com rear discs with GM metric calipers are close to neutral bias on my '64 Dart. Pistons could be a tad smaller on the back, but minor enough difference to correct with an adjustable valve. My front/rear weight bias is probably better than most - 53/47 - due to 'glass hood and no front bumper and other light parts.

Lou
Author:  Joshie225 [ Mon Jan 19, 2009 8:43 am ]
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The Jeep Grand Cherokee rear calipers have a 1.88" bore and 2.77" square inches of piston area. The GM metric caliper is 2.38" bore and 4.45" square in area. I feel much better about the little Jeep rear caliper than the GM front caliper applied to the rear axle. The Jeep caliper piston area is only 62% that of a GM metric caliper. I also like retaining the parking brake (shoes inside the rotor hat) and paying wrecking yard prices.
Author:  Dart270 [ Mon Jan 19, 2009 10:02 am ]
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Go for it.

Lou
Author:  Joshie225 [ Mon Jan 19, 2009 10:58 am ]
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I want to do the rear discs soon, but I just bought a $200 monitor for my PC so the play money is depleted at the moment.

I doubt my '67 is as well balanced as your Dart, but I haven't scaled it to get numbers.

I'm starting to pick and choose which car events to attend this year. I may go for the Spring Fling Speed Festival and more Slant Six bracket races this year, but that would mean no 24 Hours of LeMons.
Author:  Dart270 [ Mon Jan 19, 2009 12:20 pm ]
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SFSF is not looking good for me this year. Too much work stuff and travel right around then, dangit.

I am hoping for a big turnout in 2010 when the economy is hopefully in better shape.

Lou
Author:  Joshie225 [ Fri Jul 03, 2009 4:26 pm ]
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I never did post an update on how these wheels and tires are working for me. In a word, excellently.

The 255/40R17s in the back just clear the spring and do not rub on the fender. I do get a little rubbing on the inner wheel house once in a while when going in and out of driveways at an angle. In these situations one rear wheel is pushed up while the other droops. The axle twists enough that the inner sidewall contacts the wheel house. It just rubs a shiny spot on the sheet metal and doesn't hurt the wheel or tire at all. Without stretching any sheet metal this is probably the widest tire you can use and remain street friendly. I have detected no rubbing at speed in corners.
Author:  DynoDave [ Mon Jul 06, 2009 12:22 pm ]
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Quote:
Be very careful about using rear disc brakes with those Wilwood front brakes. The piston size in the Wilwoods is fairly small so you need rear calipers with tiny pistons. If you just grab a random rear caliper you'll most likely end up with rear bias which is not what you want.

I see this problem all the time since some of the more popular rear disc conversions use calipers with large pistons in them. People bolt together kits from two different mfgs and end up with a mess.
Quote:
FWIW, the TSMMFG.com rear discs with GM metric calipers are close to neutral bias on my '64 Dart. Pistons could be a tad smaller on the back, but minor enough difference to correct with an adjustable valve. My front/rear weight bias is probably better than most - 53/47 - due to 'glass hood and no front bumper and other light parts.

Lou
Quote:
The Jeep Grand Cherokee rear calipers have a 1.88" bore and 2.77" square inches of piston area. The GM metric caliper is 2.38" bore and 4.45" square in area. I feel much better about the little Jeep rear caliper than the GM front caliper applied to the rear axle. The Jeep caliper piston area is only 62% that of a GM metric caliper. I also like retaining the parking brake (shoes inside the rotor hat) and paying wrecking yard prices.
Wow, this is all good info. I have a TSM kit with GM rear calipers (caliper actuated parking brake) for my Cordoba, which uses a large single piston front caliper IIRC. This will all be good info to keep in mind.
Author:  Volare4life [ Sun Aug 23, 2009 3:25 pm ]
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joshie you'll need a spacer on the axle's face itself for the jeep rotors to seat correctly, take a look at my phobucket, I swapped a disc setup over to a 5th ave from a '96 grand cherokee, but any year from 94-98 will work, heres the link http://s19.photobucket.com/albums/b162/ ... 0SX/MOPAR/ page 2 half way down. I'm thinking using the caliper mounts, and seeing if i can use a set of calipers and rotors off something else like a Nissan 240SX, I like the whole intigrated parking brake :D, and drifting >:)

-Mike
Author:  Joshie225 [ Sun Aug 23, 2009 3:48 pm ]
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Personally I prefer parking brakes they are not part of the brake caliper. Makes caliper substitution much, much, much easier and the calipers much less expensive.

Your pictures do not make it clear why a spacer is needed between the axle flange and the brake rotor.
Author:  Volare4life [ Sun Aug 23, 2009 10:58 pm ]
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when the rotor is fully seated it rubs on the caliper mount. The face of the axle needs to be sticking out atleast 3/16" to a 1/4" more to obtain the proper geomentry of the caliper to the rotor. I'm going to the bone yard tomorrow maybe, if I do I'll take measurements off the jeep and post my findings, I leave tuesday for Mayport,Fl for my first command, also trying to finish building my slant, and get it running by tomorrow night.

-Mike
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