914-4 vs 914-6 vs 911 CV joints and axles

[dug]

914-6s have a different half-shaft and CV joints than 4 cylinder 914s. What exactly is the difference between these CVs and shafts?

I believe the half-shafts have a different spline. Is this correct? Are the CVs beefier at all? Are they the same as the 901 trans 911s?

What parts on the 914-6 are compatible with 911s of the same time period. Pelican has Empi half-shafts for early 911s complete with two CVs for crazy cheap, like $70. OEM Porsche parts are $260 complete.

I have the original half-shafts with the CVs removed for my 6, plus a second set of shafts and CVs that are still together I got from another 6.

thanks,
dug

[Eric_Shea]

The 914 CV's are the same with the exception of spline count to match the different spline cound on the shafts. Same ball size etc. Not beefier at all. The 901/911 trannied 911's have much beefier CV's.

With the hp you'll be running I like the system I have for my car.

From outside in:

911 Hub -> 911 Stub Axle -> 911 CV (108mm) -> Sway-a-Way 914 length axles (28mm longer than the 911 axles) -> 911 CV -> 911 Coarse Splined Flange.

The axles list for $308 with no adapters etc. They are free floating which is much better for higher torque settings as it allows the CV to find it's own sweet spot (big for the offroad crowd). You can order the axles through Chuck at Elephant as Sway-a-Way does not sell direct.

The Good Dr.'s red 914-8 is running 911 CV's and axles but they use a 28mm spacer at the tranny. You didn't get pictures of the tranny while in the Fatherland???

[Eric_Shea]

Here's a few shots:

[dug]

Looks like a great setup.

Does the 911 stub/hub differ from the 914-6 stub/hub?

Is the 108mm CV compatible with the 914-6 half-shafts?

Is the 108mm CV from the 72-73 911 trans cars?

Is the 911 Coarse Splined Flange from the 72-73 911 trans as well?

The 72-73 CVs are listed as $288 each from Pelican. With $308 for axles (was that each?), that makes a $1600 rear drive setup. T'ain't cheap!

thanks,
dug

[dug]

The Good Dr.'s red 914-8 is running 911 CV's and axles but they use a 28mm spacer at the tranny. You didn't get pictures of the tranny while in the Fatherland???

Indeed I did. You can just make out the spacer in the shadows...
http://www.project914.com/plogger/images/travels/porsche_museum_may_2009/dsc_0077.jpg

[Eric_Shea]

Looks like a great setup.

Does the 911 stub/hub differ from the 914-6 stub/hub?

Hub is the same. Stub is larger to accomodate the larger CV.

Is the 108mm CV compatible with the 914-6 half-shafts?

I do not think so. Count splines. If 28 then yes.

Is the 108mm CV from the 72-73 911 trans cars?

Yes. I usually get axle set-ups for $100-150 used.

Is the 911 Coarse Splined Flange from the 72-73 911 trans as well?

Yes.

The 72-73 CVs are listed as $288 each from Pelican. With $308 for axles (was that each?), that makes a $1600 rear drive setup. T'ain't cheap!

thanks,
dug

$150 plus $308 (pair) = $458 for my set-up (plus new bolts, schnorrs, gaskets, grease and elbow grease)

I believe the 930 joint will work as well. It is 108 with 6 bolts. The "pin" holes on the stubs and flanges would have to be drilled and tapped. Those are around $70-75 each.

[dug]

Thanks for the detailed info!
dug

[Richard Casto]

A bit late to this party, but I have been working on/off on a wiki article that tries to go into details about CV, hub, axle, etc. combos that work. Feel free to update if you have any good info...

http://www.roadglue.com/wiki/index.php?title=914_five_lug_suspension_conversion

[Eric_Shea]

Very thorough Richard,

Couple of things:

The Sway-A-Way part can be found in my write-up on 914World. Basically a 20.25" axle with a 28 spline count.

This comment Once this is done, each time you replace the rear brake disk you will have to have a 4 lug disk drilled to work on your 5 lug hub. This is not very close to the solution that Porsche used on the 914/6. Some feel that re-drilling the hubs is not best because they will not be as strong as a hub that was setup for 5 lug in the first place. seems a bit off. Once you drill a rear hub, you simply use a 914-6 rotor. In fact, this is very close to the -6 solution as only the spline count on the hub and stub axle is different (same CV's etc.). Now... if you drill front rotor/hubs this is true.

I don't think a -4 hub has ever failed. I only boss them to provide enough depth for stud engagement. Even without bosses they don't fail. Studs can come loose though. I find this good for cars with up to 140hp. Beyond that the CV's probably won't last.

Regarding some of the stub axles, I'll check my part numbers but they're 108mm 4 bolt. A similar tranny flange from a 901 used on a similar year 911 will also bolt right up.

Awesome write-up.

E.

[Richard Casto]

Eric,

Thanks for the feedback. I have edited the section that talks about the use of 4 lug hubs converted to 5 lug. Let me know if it doesn't look right now.

If you (or anyone) is able to add some additional info to that article, feel free to edit it directly, or email me the info and I can edit it. :)

Richard

[Eric_Shea]

Thanks Bud,

I guess I'll have to dive in and see about editing those things. New ground.

How'd your A-calipers turn out?

E.

[Richard Casto]

Thanks Bud,

I guess I'll have to dive in and see about editing those things. New ground.

How'd your A-calipers turn out?

E.

Sigh... I haven't made any progress on them recently. They are sitting on my work bench. Pretty much just need to get them replated and then assemble. Just have a bunch of stuff going on right now, so haven't spent much time on the car. Spent a few days earlier this week up in Hershey PA with Mike (aka. Dr. Evil) learning the tricks of the transmission trade.

I have some rear caliper cores that I am going to send your way sometime in the near future just as a way to say thanks for your help. :)

Richard