 Blew up another CV joint..., What to do? |
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| yarin |
 May 23 2008, 09:34 PM
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'14-X'in FOOL  Group: Members Posts: 988 Joined: 13-May 03 From: Guttenberg, NJ Member No.: 693 Region Association: North East States  |
So I need some advice on this one:
2 years ago a CV went on me during an autocross, drivers inside (tranny side). The bearing race cracked and well, u know what happens then, no power transmitted means flatbed tow truck home. Replaced all 4 CVs with the kit from PMB performance. All was well.... fast forward to today, the exact same joint blew. I haven't dissasembled for a post mortem but it isn't pretty. Luckily i flat tow the car to events now so getting home wasn't a problem. The car definitely took a beating today, put about 45 total runs (autox school x 2 drivers) on the car before it let go on Avon Tech RA tires, a few areas of the course induced some slip/grip stress. Motor is relatively stock, probably putting out about 100-110hp crank. AutoX definitely put exess wear and tear on the part, running semi-sticky tires. So what should I do, replace with another kit? OEM? Beef it up with 944 or heavy duty CVs? Any of you fellow autoxers have a solution that won't cost me a fortune? Thanks! |
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| Katmanken |
May 24 2008, 12:08 PM
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Couple of thoughts..
The beetle cv's don't have as great an angle of operation as the 914 cv's... That is, the up and down travel of the wheel is less with the beetle cv's. If you measure the axle length and the amount you can move the wheel end of the axle up, you can do a little trig and get an angle of operation. If the angle measures more than the allowable operating angle,there is a clue. Another thought- looking at the crack, inward loading of the shaft on the cv race might load the slot in the race to produce the crack as shown. It does look like a fatigue crack that propagated. Look for nicks at either end of the crack- that's where they start. Starting end of the crack can have wear from rubbing together The other though is around modern crap. Some of the products made today are NOT the products of yesterday. Those parts were made made with fanaticism to produce a reliable part. Today it's nick on the part? use it... Heat treat? who cares if it's a little off, Poison in the drugs? Ship it... Poison in the pet food? Ship the product... Ken |
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Posts in this topic
yarin Blew up another CV joint... May 23 2008, 09:34 PM
Crazyhippy I've put 400+HP through the Renegade Hybrids s... May 23 2008, 11:48 PM McMark We definitely need some pictures and a postmortem ... May 24 2008, 12:02 AM Eric_Shea
Me too. :blink: May 24 2008, 12:27 AM
Jeff Hail
Me too. :blink:
Did you get your CV from tha... May 24 2008, 12:30 AM yarin
Me too. :blink:
Did you get your CV from th... May 24 2008, 07:32 AM ericread
[quote name='Jeff Hail' post='1036159' date='May ... May 24 2008, 11:22 AM davep Does that CV have the axle go to extreme angles a ... May 24 2008, 07:42 AM DNHunt Yarin
Sorry about the CV. What pressures are you ... May 24 2008, 07:54 AM yarin Here are pics. The bearing race cracked, exact sam... May 24 2008, 11:22 AM yarin The rear is pretty flat during cornering, suspensi... May 24 2008, 11:26 AM Eric_Shea
Mark and I had been investigating an incedent wh... May 24 2008, 11:29 AM Jeff Hail
Eric, I have been.... and priming,powdercoatin... May 25 2008, 12:59 AM Eric_Shea
Yes and No. Some cars still have their stock CV... May 24 2008, 11:40 AM yarin
Yes and No. Some cars still have their stock C... May 24 2008, 11:44 AM ericread
Yes and No. Some cars still have their stock C... May 24 2008, 11:57 AM Eric_Shea These are areas of concern that I see:
Looks like... May 24 2008, 11:48 AM yarin Keep in mind that after the CV failed, it was flat... May 24 2008, 11:57 AM Eric_Shea
We don't mfg. the joints. We machine 2 of t... May 24 2008, 12:19 PM Eric_Shea
That makes a ton of sense... forgot about that. ... May 24 2008, 12:20 PM brer are those Lobro CV's you are using?
if they a... May 24 2008, 02:41 PM davep Is there any wheel hopping on the course? Somethin... May 24 2008, 02:54 PM yarin
Is there any wheel hopping on the course? Somethi... May 24 2008, 03:26 PM Eric_Shea Those are German "Meyle" not EMPI. We c... May 24 2008, 03:37 PM brer Meyle is a German company that does not produce th... May 24 2008, 04:00 PM Eric_Shea I can switch to Lobro no problem if that's dee... May 24 2008, 05:20 PM Joe Ricard I think the materails being used these days are no... May 25 2008, 07:32 AM davep Being a physicist, I can understand what Jeff is t... May 25 2008, 09:22 AM Eric_Shea
Alright, alright... so you know everything! ... May 25 2008, 12:31 PM Jeff Hail
(anybody else hate this guy?)
One more thing.... May 25 2008, 04:38 PM ericread
(anybody else hate this guy?)
One more thing... May 25 2008, 08:50 PM yarin Thanks for all the info guys! Joe has put way ... May 25 2008, 12:41 PM kwales Eric,
CV joints are a lot like ball and roller be... May 25 2008, 02:43 PM Eric_Shea
:blink: Thanks Ken...
I was just going off Jef... May 25 2008, 02:49 PM yarin Hey Jeff, thanks for your in depth analysis.. but ... May 25 2008, 05:59 PM kwales I don't hate Eric....
Anybody who does, is do... May 25 2008, 07:08 PM Eric_Shea
Thanks Ken :wub:
But I think Jeff misplaced an ... May 25 2008, 09:11 PM yarin All great points once again! How can I manuall... May 25 2008, 10:41 PM Jeff Hail
All great points once again! How can I manual... May 26 2008, 01:28 AM HAM Inc Make sure the tranny is centered between the trail... May 26 2008, 12:11 PM yarin Eric sent me a new CV no charge, got it a few days... Jun 7 2008, 03:16 PM yarin more.. Jun 7 2008, 03:19 PM yarin Here is a quick video I shot illustrating the conc... Jun 7 2008, 03:22 PM kwales All of mine slip on without pressing. That does l... Jun 7 2008, 05:51 PM yarin The tranny mounts are the solid hard mounts, engin... Jun 8 2008, 09:45 PM yarin Bump.. anyone care to share their CV installation ... Jun 10 2008, 12:21 PM racerx9146 I have a lifted Vanagon Syncro with 230 HP Subaru ... Jun 10 2008, 05:37 PM John I was about to reply that mine typically slip onto... Jun 10 2008, 02:47 PM jhadler Just thinking out loud here...
Do you run on a pa... Jun 10 2008, 06:26 PM ericread
Just thinking out loud here...
Do you run on a p... Jun 11 2008, 08:42 AM J P Stein Like HAM I think there is something specific to yo... Jun 11 2008, 10:55 AM |
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