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> Tubeframe 914, Started work on my rear custom uprights
Hontec
post Sep 29 2011, 02:13 PM
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Crap, way better than I had hoped for ( the interlocking plates and back did their job well in preventing warpage) Run-out compared to the hubmount only a minor 0,01mm (0,01 mm = 0,000393700787 inch) (IMG:style_emoticons/default/piratenanner.gif)



(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317327210.1.jpg)
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Eric_Shea
post Sep 29 2011, 05:39 PM
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Sorry... I used the wrong terminology when I said hub.

I should have said 911 bearing housing not 911 hub. A later (1974) 911 bearing housing could be cut and welded on exactly like what was done with the 914 housing. It would give you a larger bearing (for the wider tires 911's were starting to get at that time) and give you the robust handbrake stop tab, allowing the use of 911 handbrake assemblies.

I believe 911/930 and 928 cars used a very similar handbrake setup on all... similar if not virtually identical.

Here's the 911 bearing housing (this is a 70ish but a 74 would look very similar):
Attached Image

And here are examples of handbrake assemblies that would bolt on:
Attached Image

Keep up the great fab work!! (IMG:style_emoticons/default/smilie_pokal.gif)
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Hontec
post Sep 29 2011, 06:22 PM
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Thanks for the clarification Eric!!
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Brett W
post Sep 29 2011, 07:46 PM
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Don't you have to have a special rotor for that though(internal parking brake)? Kinda eliminates the option of doing a nice aluminum hat. The hot ticket is is a mechanical spot caliper. The Audi R-8 uses one the CGT used one, it wouldn't be that hard to fit the Dynalite Mechanical spot caliper for use with a disk setup.

http://www.wilwood.com/Calipers/CaliperLis...ame=Mech%20Spot

Several companies offer them though.
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Hontec
post Sep 29 2011, 07:55 PM
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QUOTE(Brett W @ Sep 30 2011, 03:46 AM) *

Don't you have to have a special rotor for that though(internal parking brake)? Kinda eliminates the option of doing a nice aluminum hat. The hot ticket is is a mechanical spot caliper. The Audi R-8 uses one the CGT used one, it wouldn't be that hard to fit the Dynalite Mechanical spot caliper for use with a disk setup.

http://www.wilwood.com/Calipers/CaliperLis...ame=Mech%20Spot

Several companies offer them though.



Correct but if I use the 930 turbo disc (309x28) instead of the 928S4 disc (304x31) I have the correct bellhousing for the parking brake backplate. With the 930 turbo disc I can still use the brembo 4-pots and I Will also make provisions for à separate parking brake caliper, just to have the option to change if needed..
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Randal
post Sep 29 2011, 08:28 PM
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QUOTE(Hontec @ Sep 29 2011, 06:55 PM) *

QUOTE(Brett W @ Sep 30 2011, 03:46 AM) *

Don't you have to have a special rotor for that though(internal parking brake)? Kinda eliminates the option of doing a nice aluminum hat. The hot ticket is is a mechanical spot caliper. The Audi R-8 uses one the CGT used one, it wouldn't be that hard to fit the Dynalite Mechanical spot caliper for use with a disk setup.

http://www.wilwood.com/Calipers/CaliperLis...ame=Mech%20Spot

Several companies offer them though.



Correct but if I use the 930 turbo disc (309x28) instead of the 928S4 disc (304x31) I have the correct bellhousing for the parking brake backplate. With the 930 turbo disc I can still use the brembo 4-pots and I Will also make provisions for à separate parking brake caliper, just to have the option to change if needed..



Amazing work so far Randall. When you finish that beauty bring it over here and we'll find some Oregon or Idaho Hill Climbs to run.
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Hontec
post Sep 30 2011, 12:19 AM
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QUOTE(Randal @ Sep 30 2011, 04:28 AM) *

QUOTE(Hontec @ Sep 29 2011, 06:55 PM) *

QUOTE(Brett W @ Sep 30 2011, 03:46 AM) *

Don't you have to have a special rotor for that though(internal parking brake)? Kinda eliminates the option of doing a nice aluminum hat. The hot ticket is is a mechanical spot caliper. The Audi R-8 uses one the CGT used one, it wouldn't be that hard to fit the Dynalite Mechanical spot caliper for use with a disk setup.

http://www.wilwood.com/Calipers/CaliperLis...ame=Mech%20Spot

Several companies offer them though.



Correct but if I use the 930 turbo disc (309x28) instead of the 928S4 disc (304x31) I have the correct bellhousing for the parking brake backplate. With the 930 turbo disc I can still use the brembo 4-pots and I Will also make provisions for à separate parking brake caliper, just to have the option to change if needed..



Amazing work so far Randall. When you finish that beauty bring it over here and we'll find some Oregon or Idaho Hill Climbs to run.


That would sure be nice, I am a huge hillclimb fan!!!
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Hontec
post Sep 30 2011, 12:32 AM
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Some people expressed concerns regarding welding the cast iron flange, well I'm not quite sure if it is cast iron and in the stock trailing arm, these flanges are also welded on the tube by Porsche itself, so my filosofy is: if they can weld it, I can too

explanatory pics:

(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317364356.1.jpg)


(IMG:http://i854.photobucket.com/albums/ab101/randallenabe/porsche%20914/porsche914608.jpg)
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Brett W
post Sep 30 2011, 06:34 AM
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Pretty sure they are cast steel, not cast iron, so they should be fine when welding. I have welded on a few and they are pretty clean so I see no issues there.
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Eric_Shea
post Sep 30 2011, 09:48 AM
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Agree... Very weldable as noted, that's exactly how the factory did it.
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andys
post Sep 30 2011, 10:39 AM
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The larger 911 bearing (513180), according to my bearing chart, goes back to 1978 but I'm not be sure which bearing was used before that on the 911....perhaps my chart in incomplete?

For my custom training arms, I machined my own bearing carriers but frankly it was a lot of work. It would be much easier to adapt an exising carrier.

Andys


Attached image(s)
Attached Image
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Brett W
post Sep 30 2011, 02:03 PM
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For reference. The 02 GT2 uses an 85mm rear wheel bearing. The 89 930 uses two 82mm taper roller bearings, 78-89 911 uses an 80mm bearing in the rear, the 987/997 uses an 80mm bearing all the way around, the 986/996 use a 75mm bearing all the way around, the 914-4 uses a 75mm wheel bearing. I am pretty sure it is the same bearing as the Boxster and 996 use.
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Hontec
post Sep 30 2011, 10:46 PM
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Thanks guys for all the input, work Will continue Next tuesday when I'm back from my visit to China

@ Andys: those hubs look mighty Nice!!!
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nsr-jamie
post Oct 1 2011, 06:55 AM
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Wow! Looking good !! Glad to see updates on this project and thread....nice Mistutoyo gauge too, I have the same one.

China?? Come to Japan!!

Those are beautiful welds !!
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Hontec
post Oct 1 2011, 07:36 AM
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Thanks Jamie!

Tokyo in 2 weeks from now (IMG:style_emoticons/default/smile.gif)
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Hontec
post Oct 4 2011, 12:33 PM
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The whole integral handbrake thing got me thinking; why not, don't have to install it, but it would be nice to have the option to do so.

So I got started on it, Had already bought some backplates and refurbished handbrake parts, just had to modify the bearing carrier and hub.

Decided to make a bracket that spaces the brake shoes, as well as lets the assembly rest on when the cabe is pulled, so the backplates will not deform.

I read some descriptions on how the separating tube enables both actuating levers to be pressed together to force the brake shoes out, but I also read that when converted to 914 use, only the outer lever functions by pulling the cable.

Since the pulling cable/moving sleeve is to cumbersome for me when I install the handbrake lever and one lever functions quite well, I,ve decided to leave the lower lever out and install a flat plate to rest the spring on that is installed between the two levers. In the picture this is not done yet since I'm waiting on my 911 cables and then I can finish the assembly.

Pictures for today:

(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753212.1.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753212.2.jpg)


(IMG:http://i854.photobucket.com/albums/ab101/randallenabe/porsche%20914/porsche914611.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753213.3.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753213.4.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753213.5.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753214.6.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753214.7.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753214.8.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753215.9.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753215.10.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753215.11.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753216.12.jpg)


(IMG:http://i854.photobucket.com/albums/ab101/randallenabe/porsche%20914/porsche914622.jpg)


(IMG:http://www.914world.com/bbs2/uploads_offsite/i854.photobucket.com-12210-1317753216.13.jpg)
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BKLA
post Oct 4 2011, 01:50 PM
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that's just sweet!
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Eric_Shea
post Oct 4 2011, 07:45 PM
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There ya go! (IMG:style_emoticons/default/smilie_pokal.gif)
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MDG
post Oct 4 2011, 08:06 PM
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(IMG:style_emoticons/default/smilie_pokal.gif) That is so good. Like mad scientist good.
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moparrob
post Oct 4 2011, 08:19 PM
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QUOTE(MDG @ Oct 4 2011, 07:06 PM) *

(IMG:style_emoticons/default/smilie_pokal.gif) That is so good. Like mad scientist good.

(IMG:style_emoticons/default/agree.gif)
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