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> Using mid 70's 911 rear hub-centric axle flanges, Anyone know the procedure?
PRS914-6
post Dec 26 2006, 11:05 AM
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I don't have my car here to get measurements so I am hoping someone has dealt with this. I have 69 911S flanges and stub axles (108mm cv's) that work perfect but the flanges are not hub-centric. I would like to modify a set of 77 hub-centric flanges to work if possible since I have an extra pair.

I know the bearings are wider on the 77 flanges. Anyone know what they did different? Is the flange overall length wider to allow a wider bearing or is the bearing fit area machined further towards the flange itself making a wider fit area? Since I have a lathe, I can modify......

Anyone used these?
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John
post Dec 26 2006, 11:17 AM
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I have not yet used them, but since more years used those flanges, I am interested in finding out the answers you seek.

If you already have a pair, why not measure them.

I believe that the aluminum trailing arms were simply machined deeper than the steel ones to accept the wider bearings. I am assuming that the bearing area (the area that the bearing rides on the outer flange of the hub) is wider on the later cars. I would also assume that the use of an appropriate spacer (to fill the area where a bearing would have been) would be an alternate to turning down the hubs as you mention.

I only have possessed the early (lug centric) versions of the hubs as that is what we run, so I don't know all the details of the later model (1974-1989) 911 outer hubs.

Please post some pics.
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PRS914-6
post Dec 26 2006, 11:33 AM
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QUOTE(John @ Dec 26 2006, 09:17 AM) *


If you already have a pair, why not measure them.



Thanks John, like I said above, I don't have my car here to compare or this would be easy.....I can measure the 911's now.

If the factory machined the bearing fits further into the flange, a simple spacer will fix the problem. If the hubs are actually longer overall to get the wider fit, machining may be in order...Someone must have tried this....

I'm assuming the spline is the same internally? I don't want to lose my 108mm stub axles.....
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John
post Dec 26 2006, 11:42 AM
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When I get home, I can measure an early 911 hub if that will help.
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John
post Dec 26 2006, 11:44 AM
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I know for a fact that the internal splines are the same. We are using Carrera axles (outer stub axle is part of the axle assembly) with early hubs.
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PRS914-6
post Dec 26 2006, 12:02 PM
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OK, that's great. Sometime today, I'll post dimensions of the later flange....
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John
post Dec 26 2006, 12:16 PM
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QUOTE(PRS914-6 @ Dec 26 2006, 10:02 AM) *

OK, that's great. Sometime today, I'll post dimensions of the later flange....


Then I can post comparable dimensions from the early hub.

Then we should both know the story. (Since I want to do this as well)
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PRS914-6
post Dec 26 2006, 02:31 PM
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OK, here we go......Flange is off a 1977 911
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John
post Dec 26 2006, 02:35 PM
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Since you made such good pics, I'll just post dimensions and reference your (new) dimensions to my (old) dimensions. It's only a couple hours before I get to go home.......
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PRS914-6
post Dec 26 2006, 02:46 PM
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And this is why we want this type flange. The raised portion in the center locates the wheel instead of the lug nuts. The other type of flanges are flat all the way across.......Hub-Centric is a much better method of wheel locating than lug nuts
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John
post Dec 26 2006, 02:53 PM
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That, and I think more of them are the hub centric type than the early ones some people want a mint for. (I'm looking for less expensive, more readily available parts......)
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PRS914-6
post Dec 26 2006, 03:00 PM
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John, I labeled the pictures. Should be easier for you to respond.
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Eric_Shea
post Dec 26 2006, 03:02 PM
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I only have a pile of early bearings in stock currently but I believe the OD on the bearing is larger as well.

Early 911 should be:

35.5mm length of shaft vs. your 40.8mm
42mm diameter of shaft vs. your 42mm
68mm total height vs. 69mm (could be straight edge fudge factor)
33mm base to face vs. your 28mm

Let's see what John comes back with.

Looks to me like they simply machined more off the backside of the hub for the longer bearing. I believe it's fatter to though (OD of the bearing) as the handbrake assembly changed to a larger bolt spacing with this new bearing.
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post Dec 26 2006, 03:09 PM
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Eric, if you are right, a simple spacer installed over the flange will allow these to work.....
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Eric_Shea
post Dec 26 2006, 03:50 PM
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5mm correct-a-mundo
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Eric_Shea
post Dec 26 2006, 03:54 PM
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Costco = Best deal on latex gloves (IMG:style_emoticons/default/w00t.gif)

(IMG:style_emoticons/default/wink.gif)
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PRS914-6
post Dec 26 2006, 04:09 PM
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QUOTE(Eric_Shea @ Dec 26 2006, 01:54 PM) *

Costco = Best deal on latex gloves


Damn, you are right....I found a pair with your name on it..... (IMG:style_emoticons/default/happy11.gif)
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Eric_Shea
post Dec 26 2006, 05:58 PM
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(IMG:style_emoticons/default/av-943.gif)

HEY! Wait a minute... that's mean (IMG:style_emoticons/default/mad.gif)
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Allan
post Dec 26 2006, 06:18 PM
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QUOTE(Eric_Shea @ Dec 26 2006, 03:58 PM) *

(IMG:style_emoticons/default/av-943.gif)

HEY! Wait a minute... that's mean (IMG:style_emoticons/default/mad.gif)


(IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif)
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John
post Dec 26 2006, 06:28 PM
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I measured one. (Eric, I still have no word from USPS on the lost hubs, I'm guessing they are gone for good.)

A. 68.50 mm
B. 32.40 mm
C. 36.10 mm
D. 42.01 mm

These are real close. I tried in several spots around the hub.

They agree pretty much with what Eric found.

It looks like a 5+/-mm spacer would work nicely with the late model hubs.

Good info in this thread.

Time to go shopping......
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