84-87 12" Corvette Brake Swap... (Page 13/28)
Fierofreak00 DEC 31, 12:50 PM

quote
Originally posted by 87GTBro:


The lug bolts still retain the original location and pattern. The rim will center just as it did on the original hub. You will be installing longer lug bolts on the front to account for the thickness of the added rotor.

The concentric rings are designed to center the rotor, not the rim.

Oh, BTW, If anyone would like AutoCAD drawings of the adapters needed for this upgrade, drop me a line at dcampbell@rgv.rr.com

All you have to do is take the drawings to any machine shop with the right tools and they can run the parts for you. These are the same drawings I used on my swap and the adapters worked perfectly.



PM semail sent- Jason
typhoon DEC 31, 03:03 PM
pm sent

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..from beautiful Caledonia, WI
87 GT 5 speed Electron Blue V8 SBC TPI
87 GT 5 speed med red (for sale)
94 BMW 850Ci V12 (for sale)
93 GMC Typhoon (for sale)
05 Caddy STS
00 Pontiac GTP with GTX package
96 Suburban
92 Dodge Shadow 28K miles

Will JAN 04, 10:08 PM

quote
Originally posted by 87GTBro:
The rims do not even touch the 1/8" protrusion or hat (dust cover) that covers the castle nut on the front hubs. If you have ever noticed the tapered edge on a lug nut, that taper is designed to center each hole in the rim over the lug bolt. This is what centers the rim on the hub. If the rim was indeed centered by that lip on the hub, it would be necessary that all rims be manufactured with identical center bore diameters. This just isn't the case.

The answwer to your original question though is:

No, this swap has no affect on the centering of the rims on any of the four wheels. Because the lug bolts are all still in the stock location, the rims still stay centered on the hubs.



Incorrect.
From the factory, the wheels DO center on the hub pilot.
Using brake upgrades with separate rotors does indeed reduce the length of the protrusion such that the wheels no longer contact it.
After doing the upgrade, the wheel is then centered by the lug nuts. This is NOT the same and is NOT as good as a positive location via pilot & bore.
However, this seems to be "good enough" that people don't have any problems with it.

I think it's sloppy and one of the major problems with Fiero brake upgrades. Would you trust that the lug studs locate the wheel well enough that it won't shake you into a crash at 150+ mph?
typhoon JAN 05, 05:17 PM

quote
Originally posted by Will:
I think it's sloppy and one of the major problems with Fiero brake upgrades. Would you trust that the lug studs locate the wheel well enough that it won't shake you into a crash at 150+ mph?



Got a 150 mph Fiero? Anyone...Bueller? ;-)

------------------
..from beautiful Caledonia, WI
87 GT 5 speed Electron Blue V8 SBC TPI
87 GT 5 speed med red (for sale)
94 BMW 850Ci V12 (for sale)
93 GMC Typhoon (for sale)
05 Caddy STS
00 Pontiac GTP with GTX package
96 Suburban
92 Dodge Shadow 28K miles

Will JAN 07, 10:21 PM
Check.
Ratfart JAN 08, 11:28 AM
Right on Will. Pilot & bore locating is the only way I would be comfortable. I hope all the brake conversions out there are retaining that feature.
And some of us do have 150MPH capable Fieros.
dguy JAN 08, 12:59 PM

quote
Originally posted by Will:


Incorrect.
From the factory, the wheels DO center on the hub pilot.



Thank you.

Didn't mean to steer this toward (yet another) hub vs. lug centric discussion, but figured it would go that way the moment I started typing. ...and look, it did.

So once again for anyone who has this modification in progress, or has completed it and doesn't mind pulling a wheel to measure... How much, if any, of the hub pilot protrudes past the 'Vette rotor once the front components have been modified and assembled?

edit: Never mind. Will's comment above answered my concerns.

[This message has been edited by dguy (edited 01-29-2007).]

Will JAN 09, 02:35 PM

quote
Originally posted by Ratfart:

And some of us do have 150MPH capable Fieros.



Which is why we want 12+ inch brakes.
antinull.com JAN 21, 01:31 AM

quote
Originally posted by dguy:


Thank you.

Didn't mean to steer this toward (yet another) hub vs. lug centric discussion, but figured it would go that way the moment I started typing. ...and look, it did.

So once again for anyone who has this modification in progress, or has completed it and doesn't mind pulling a wheel to measure... How much, if any, of the hub pilot protrudes past the 'Vette rotor once the front components have been modified and assembled?



and "hijack"
what do you mean hub vs. lug centric?
Kristian V JAN 29, 06:25 PM
Is there any problems if i wana go with 88 calippers?
I have a chanse to buy front calippers from a 88 vette, for a realy good price, complete with rotors.
I realize the adapters in the drawings are for 84-87 calippers, but is there other differences than the mounting holes being wider appart on the 88 calippers?

Kristian.