PorscheLars

I know CV joints is a well handled topic, and I have read some post's, but it seems to be clear that it is no easy solution for a real heavy duty bolt on cv joints.

After replacing 8 CV joints since 2003. I checked my CV joints today after new noises.

Metal flake in all joints, have not washed yet for full inspection.

I have tried GKN, and OEM + a lokal drive line work shop's parts.

So far it seams like OEM is sligtly better than standard GKN !? (I will not say this fore sure, I check closer tomorrow for the axel with both types) Anyone who race different types with better luck? The CV joints from the drive line work shop I tried exploded the first round with hot tires on the track. (sharp turn, Toyo RA1 245, WOT)

Anyone tryed this?
http://www.pegasusautoracing.com/pro...p?Product=1471
Is it better tan OEM? or is OEM te same?

All kind of experiences - ideas are welcome :-)

(I drive a 951 3.0t 1986 full weight. 400+hp (DIN) TQ = ? (3 test on 3 dyno's no results, to little friction but may be around 400lb/ft)

(no spell check)

:-)

333pg333

I would also be interested in an upgrade to the stock items. May be possible to customize 928 CV's or 996/7's to fit. May also look to stronger axles?

Acetylene

Just replaced both axles w/ O.E., but may still be interested in an upgrade.

95ONE

ok. Just broke mine. I'm going to do something about this. They broke EASY. Well.. It broke. Just one side. The Nissan 240sx axles may do something for us. Or the skyline. Totally custom Chromolly. Whatever, with a better Cage. It's the Cage that's the Weak link. I may just make those. I hope I don't break any rules here. But do any of the vendors sell upgraded Axles? CAN HANDLE REAL POWER axles? I will give directions on how I do it once it's done. You can repeat. Ask for my help. Whatever.

If anyone is offended by this post. I sincerely apologize. I don't want to step on anyone's toes.... But I kept hearing.. But... Damn. That was ridiculous. I constantly find I was very spoiled by Hondas. I can't beleive how easy that broke..


EDIT: Was i drinking way too much caffeine when I wrote this?

Yellow Arrow

anyone know if this is better spesifikation than the OEM CV joints.
Heavy-duty version now comes honed for smoother operation with inner and outer race machined from 8620 steel, and a billet cage of 4340.

GKN and OEM looks different. Black vc steel and the ***** is steel vs coated steel.

I think GKN also make some expensive motorsport products. but i dont know if this is just lighter?

from the GKN website.. If your next project demands superior performance talk to the specialists at GKN Motorsport.
May be they have other/stronger options - not just lighter.
http://www.gknservice.com/gkn-ids/js...motorsport.jsp

Luis de Prat

Exactly. GKN are also 1mm less thick than OE. Just another example of how OEM is not always the same as OE (original equipment) from Porsche even though the parts manufacturer may be the same.

I think the best option is to buy OE from Porsche unless someone comes up with a better source. I believe they come in Kit form from Porsche, together with the bolts, boot, and grease.

Yellow Arrow

Yes I am agree. I may have some pictures soon to "prove" the differences i quality.

I am out and degrease now, and the GKN does not look good. The other CV joint on the same axsel is from Porsche and fitted same date. Both with the same grease.
Porsche CV joint toward the weel and GKN on the gear side.

Not to throw **** on GKN products. This is not an scientific report.
Things like wear in the spines and bent axsel could may be result in the differences i discover.

Last time it was the weel side who broke (not GKN or OE). Seems to be the same wich side who wear first. Other conditions may have a influence on hwo break/wear first.

But I still wonder if Heavy-Duty Lobro CV Joint, Honed w/ 4340 Billet Cage FF/S2/F2 is prodused in 100mm OD 33 splines version and if this is a better CV joint than lobro OE to Porsche.

Or if there is other manufactures making better CV joints

blown 944

This is a good thread.

Does anyone know the lengthth and spline of these cv axles?

I am curious if one could take a heavy duty cv of the same spline and machine the flange or make new flanges in order to build a higher quality shaft ?

I am looking to launch the little 44 pretty hard in the future and would like to get something done before hand to make sure my day isn't as short as 95one's.

Again I realize these aren' quarter cars.... yada yada yada.... but there can be room for imrovement, regardless.
Sid

Skip Wolfe

I have heard good things about the GKN Motorsports axles and that they are much stronger. No first hand experience.
http://www.lindseyracing.com/mm5/mer...Category_Code=

reno808

How about solid axles????

Luis de Prat

Unfortunately, you need for the axles to be able to "flex" in the 944 series cars, unlike solid axle set ups like the Mustang, etc.

As for the CVs themselves, I went through great lengths to find comparable quality from GKN directly (they manufacture Löbro) as I was getting from Porsche but no dice.

Porsche obviously has higher specifications for quality from GKN/Löbro than Volkswagen, and it makes sense. What has higher HP output, a 951 or a VW Bus?

Like our Norwegian friends have pointed out, the GKN units are steel-colored, whereas the stock replacements are black. When I compared the two, I noticed the difference in thickness, also.

Someone else pointed out that the "weak point" were the cages and I'm interested about why they suggested this since the CVs I've replaced were all suffering from "rub marks" on the big races but the cages themselves were intact.

Thanks for the info!

kevincnc

Why would they need to flex?

blown 944

I was thinking something similiar to the corvette half shaft but then the additional stress would compound to the carrier.

I am currently researching a replacement transaxle altogether that could hold up to some ungodly torque. This coupled with a half shaft could really change the durability of the 44/ 51 drivetrain.

PorscheLars

(Kevin: Flex absorbs torque)

Solid axles? My axles is 27mm solid.. issnt all that?

I have cleaned all 4 CV joints now

The 2 newest is 1 OE (but this have the metallic colour on my axle, the dark one is the GKN) and 1 GKN. The GKN was wery bad. One little fraction off and a lot pitting in the inner tracks (spline side).
This CVJ was fitted to a spline who was not perfect i clearance to the CVJ. I could feel a little movement, and it was easy to pull off. The 3 other CVJ was all werry firm.
OE CVJ looks good.
Te grease i used on this was the grease who followed with the CVJ.
One of the 2 other on the older CVJ (ALL GKN) has minor pitting and OK cages.
This to eldest CVJ was cleaned and greased with LE Almasol grease at the same time I fitted the other. (Red colour and was still red today)

All 4 CVJ had more or less metall flace visible in the grease.

Dimensions for the CVJ ? I can take some measurements tomorow.

GKN motorsport from LR? Yes why not ? :-) Anyone had trubble with old OE and solved it with this?
But only for te newer 944 Turbo from 87 on. :-(


btw Yellow Arrow and PorscheLars is me, he he, didnt remember my password and was on another laptop.

kevincnc

[QUOTE=PorscheLars](Kevin: Flex absorbs torque) QUOTE]

I realize that the twisting of the shaft would lessen the shock on the CV's. I was just wondering if this is the only reason, to help keep the CV's from failing.