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Porsche 930 CV conversion axle length?
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syncrogreg
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PostPosted: Sat Aug 08, 2015 9:05 pm    Post subject: Reply with quote

Can somebody refresh my memory and tell me what torque is the cv to flange? Go westy 930 Turbo type.

I have the torque wrench in hand... just waiting. Thanks

Greg
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syncrodoka
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PostPosted: Sat Aug 08, 2015 9:09 pm    Post subject: Reply with quote

45lbs is the value that I have found on the interwebs and it has been working well for me.
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syncrogreg
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PostPosted: Sat Aug 08, 2015 9:54 pm    Post subject: Reply with quote

Thanks! I just rebuilt the trans from a mainshaft failure right at the smallest diameter point... the groove just behind the splines section where you screw the output shaft. the reasons are unlimited... but I think I abused my driveline in the 4wd mode with front and rear tire not at the same wear... so That would put so me fatigue over and over every revolution. Oh well. Hope we make an other 50.000 km so we get out of Patagonia back to the us Wink

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SyncroGhia
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PostPosted: Sat Aug 08, 2015 10:55 pm    Post subject: Reply with quote

The factory figure for M10 bolts on a Syncro 16 (comes with 108mm cv joints) is 66 ftlbs.

This is also the figure used by Porsche when 108mm cv joints are used.

MG
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SyncroGhia
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PostPosted: Sat Aug 08, 2015 10:59 pm    Post subject: Reply with quote

Just an update on cv boots.

I've been running a Touareg front inner cv boot for a couple of years now. It's plastic rather than rubber and it needs a jubilee clip to hold it onto the drive-shaft, the normal crimp clips aren't strong enough.

MG
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ALIKA T3
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PostPosted: Tue Oct 06, 2015 7:49 pm    Post subject: Reply with quote

Hi folks!

I've been fooling around yesterday with my new 930 CV joints and silicone boots.

Here are some interesting numbers:

Löbro 108x32mm 28 splines CV joint with grease.Same as Syncro 16". 1598 grams.
Image may have been reduced in size. Click image to view fullscreen.


GKN (Löbro) 108x40mm 28 splines CV joint, new, lightened and polished.1545 grams.
Image may have been reduced in size. Click image to view fullscreen.


Empi 108x40mm 28 splines CV joint, new.1851 grams.

Image may have been reduced in size. Click image to view fullscreen.


100mm 25 splines Cv joint weight: 1389 grams. No pictures, info taken online.
I don't have the weight of the 33 splines model yet but it should be close.


Empi 930 (108mm) style transmission flange for 091, 091/1 and 094 transmissions. 701 grams.
Image may have been reduced in size. Click image to view fullscreen.


Original VW transmission flange, 100mm. 715 grams.
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Empi flange with 3/8" hardware slightly too long (about 1/4"):932 grams.
Image may have been reduced in size. Click image to view fullscreen.


VW flange with original triple square hardware and spreader plates:889 grams.
Image may have been reduced in size. Click image to view fullscreen.



Triple square M8 bolt with lock washer: 22.4 grams.

Image may have been reduced in size. Click image to view fullscreen.


3/8" hardware slightly too long (about 1/4"): 38.4 grams
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Original VW spreader plate for 100mm cv joints: 13.1 grams.

Image may have been reduced in size. Click image to view fullscreen.


Aftermarket spreader plate for 100mm cv joints: 10.3 grams
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Original VW spreader plate for 108mm cv joints: 11.9 grams.

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And some van porn:

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Last edited by ALIKA T3 on Tue Oct 06, 2015 9:12 pm; edited 2 times in total
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furrylittleotter
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PostPosted: Tue Oct 06, 2015 8:27 pm    Post subject: Reply with quote

I like the lightened cv idea and the silicone boots look cool. I have burley setup and the boots have held up fine but if they fail I might like silicone next time.

Also interesting to see the weights. I always thought the weight trade off was worth the piece of mind of stronger components, but when it is time to replace my cvs ( I just did) I may consider lightened ones. I like how I could feed the bolts in then wipe the threads and apply loctite possibly. Not that mine have ever loosened....

I think Oem was a joke so this is one of my favorite upgrades.

Great to see innovation and new products.

Neil2 Cool
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FrankenSubySyncro
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PostPosted: Tue Oct 06, 2015 9:16 pm    Post subject: Reply with quote

ALIKA T3 wrote:
Hi folks!
Image may have been reduced in size. Click image to view fullscreen.



Alika I love your enthusiasm and ingenuity.

Is this a 930 joint shaved down? Did you buy it or have it machined? How much do they cost?

I love the silicone boots too. How much are they and are you selling any?


I will be coming to Honolulu in February for work but am staying the weekend. It would be great to meet you and hang out. PM me if you are interested.
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ALIKA T3
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PostPosted: Tue Oct 06, 2015 9:18 pm    Post subject: Reply with quote

furrylittleotter wrote:
I like the lightened cv idea and the silicone boots look cool. I have burley setup and the boots have held up fine but if they fail I might like silicone next time.

Also interesting to see the weights. I always thought the weight trade off was worth the piece of mind of stronger components, but when it is time to replace my cvs ( I just did) I may consider lightened ones. I like how I could feed the bolts in then wipe the threads and apply loctite possibly. Not that mine have ever loosened....

I think Oem was a joke so this is one of my favorite upgrades.

Great to see innovation and new products.

Neil2 Cool


Thank you Wink

Yeah, with lightened 930 CV joints, the difference with original 100mm cv joints is like 200 grams heavier. Nothing to cry about.
I saw reinforced differential nut and double bearings here before, but now that I have weight facts I feel better about the weight difference Razz
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ALIKA T3
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PostPosted: Tue Oct 06, 2015 9:46 pm    Post subject: Reply with quote

FrankenSubySyncro wrote:
ALIKA T3 wrote:
Hi folks!
Image may have been reduced in size. Click image to view fullscreen.



Alika I love your enthusiasm and ingenuity.

Is this a 930 joint shaved down? Did you buy it or have it machined? How much do they cost?

I love the silicone boots too. How much are they and are you selling any?


I will be coming to Honolulu in February for work but am staying the weekend. It would be great to meet you and hang out. PM me if you are interested.


Aloha brah! Razz

Yes it is a machined down CV joint. They are rather pricey, but I read so many bad things about CV joints, so I paid for good stuff hoping it will be good forever...

I got these http://www.pacificcustoms.com/mm5/merchant.mvc?Scr...ange_high=

These are even more bad ass, but a lil' more expensive http://www.pacificcustoms.com/mm5/merchant.mvc?Scr...ange_high=

The boots will go for 70 bucks a pair.

It will be nice to see you again Wink .Lemme know when bc I have family over sometimes in february so I might be busy.

Cheers!
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furrylittleotter
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PostPosted: Tue Oct 06, 2015 11:46 pm    Post subject: Reply with quote

The ones you linked to are listed as "Lightened, prepped" that is short for "race prepped", which I believe will behave slightly different than non race prepped joints.


Please Keep us up to date on your experience with them. I am curious, I suspect they will be noisier and possibly like to be repacked more often.



Neil2 Cool
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ALIKA T3
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PostPosted: Wed Oct 07, 2015 10:24 am    Post subject: Reply with quote

furrylittleotter wrote:
The ones you linked to are listed as "Lightened, prepped" that is short for "race prepped", which I believe will behave slightly different than non race prepped joints.


Please Keep us up to date on your experience with them. I am curious, I suspect they will be noisier and possibly like to be repacked more often.



Neil2 Cool


The syncro van is a long project, no updates coming soon Confused

I wanted them prepped, it avoids binding from day one when new (I think that's how to say it in english) and thus avoiding pitting greatly. They do feel loose, but no noticeable play. Smooth stuff.
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furrylittleotter
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PostPosted: Wed Oct 07, 2015 2:06 pm    Post subject: Reply with quote

I understood what you wrote perfectly.

I wasn't implying they were bad or wrong, just different.

That's why I'm curious to hear your experience with them.

The looseness when new was the first sign there is definitely a difference, not just theory.

Just curious how it will pan out.

Hope you are driving sooner than later.

Neil2 Cool
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Syncrodelic
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PostPosted: Mon Sep 19, 2016 2:15 pm    Post subject: Re: Porsche 930 CV conversion axle length? Reply with quote

It looks like I'm able to get my hands on a pair of 24" Empi 930 axles. I believe from what I've read here in this thread that the axles should be 22 7/8" long for the front of a Syncro (someone please correct me if that is not right).

There seems to be lots of spline length on the axles--does anyone know if there will be enough spline left if I cut 9/16" off each side?

Also, throughout this thread (and elsewhere) I have been unable to find a measurement on where to cut the groove for the circlips. Does anyone have this measurement?
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Syncrodelic
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PostPosted: Tue Sep 20, 2016 8:03 am    Post subject: Re: Porsche 930 CV conversion axle length? Reply with quote

Also, does anyone know a supplier for 930 drive flanges?
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ALIKA T3
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PostPosted: Sat Aug 10, 2019 12:33 am    Post subject: Re: Porsche 930 CV conversion axle length? Reply with quote

Alright, some little progress as I keep building (slowly) my Syncro.

The following measurements are taken on 14" TD Syncro ( 2WD chassis) with 930 Empi flanges on the transmission and Avery's Aircooled
modified stub axles. One could make a function on a computer, for what it's worth.

Full droop with my shocks:
-555mm from center of hub to wheel arch
-593mm from bolt to bolt on rear shock absorber
-526mm flange to flange.

Horizontal axle set up: ( theorically the shortest distance seen between flanges):
-415mm from center of hub to wheel arch
-440mm from bolt to bolt on rear shock absorber
-516mm flange to flange.

Fully compressed set up ( no spring, contact between LCA and upper bump stop: I added a 15mm piece of plywood since that metal tower bump stop is 85mm long vs 70mm on the 2WD).

Image may have been reduced in size. Click image to view fullscreen.


-366mm from center of hub to wheel arch
-390mm from bolt to bolt on rear shock absorber
-519mm flange to flange.

I have 20-1/4" splined shafts, 507mm from outer clip to outer clip.
The 930 CV joints are 40mm thick.
Their mesured plunge is 15mm.

Fully compressed 930 style axle 490mm ( measured 519mm flange to flange on the van, no axle)
Fully extended 520mm. (measured 526mm flange to flange on the van, no axle). I'm short 3mm each side, but I plan on using limiting straps that are about 35mm shorter than the maximum extended shock absorber measurement of 593mm bolt to bolt), so I call it good enough. I will have 2 weld spots on the back of the CV joint to act as a circlip stop since nobody can do that here). I could always put that stop 3mm inwards and have the axle splines slide a bit.
Image may have been reduced in size. Click image to view fullscreen.


The shock absorber bolts are M12x1.5x60mm. I will install 80mm bolts with spacers to install the limiting straps.





Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.


For info my 930 stub axle is 2mm longer than stock. Empi transaxle flanges measurements have been posted previously, against stock sizes of 16" and 14".
Image may have been reduced in size. Click image to view fullscreen.


This is the measured maximum stock axle angle out of LCA and driveshaft out of the van. 20 degrees. Full droop, axle touching the LCA. Impossible to replicate in the van since there's more limiting travel on the LCA even with no axle you can't get that low on stock set up.
Image may have been reduced in size. Click image to view fullscreen.

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Syncro transmission upgrade parts in the Classifieds.
Subaru EJ22+UN1 5 speed transmission
http://www.thesamba.com/vw/forum/viewtopic.php?t=416343
Syncro http://www.thesamba.com/vw/forum/viewtopic.php?t=4...num+gadget
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Multiman mv
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PostPosted: Sat Aug 10, 2019 2:55 am    Post subject: Re: Porsche 930 CV conversion axle length? Reply with quote

Call Burley. Even though you didn’t get his kit I’m sure he’d be happy to talk 930s with you.
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ALIKA T3
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PostPosted: Sat Aug 10, 2019 1:39 pm    Post subject: Re: Porsche 930 CV conversion axle length? Reply with quote

Multiman mv wrote:
Call Burley. Even though you didn’t get his kit I’m sure he’d be happy to talk 930s with you.


I don't need anything? Razz

Burl is a cool guy, spoke to him a few times Smile
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Silicone Steering Boots and 930 Cv boots for sale in the classifieds.
Syncro transmission upgrade parts in the Classifieds.
Subaru EJ22+UN1 5 speed transmission
http://www.thesamba.com/vw/forum/viewtopic.php?t=416343
Syncro http://www.thesamba.com/vw/forum/viewtopic.php?t=4...num+gadget
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