Blew up another CV joint..., What to do? Options

[yarin]

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!

[Eric_Shea]

I'm wondering if generally speaking those CVs aren't built to stand up to autoX use... will break down and take pics today. The contents on the CV might be shredded since i flat towed it home after. But i'll post pics to compare..

Mark and I had been investigating an incedent where, on his way out to RRC last year, his CV inner cage snapped. These are the only two failures we've seen out of now roughly 100 CV's. Mark's situation was a little "interesting" but not beyond what others could encounter. He was pulling out of an entrance apron which allowed one wheel to extend while accelerating.

When the gang arrived here I gave him a new CV and we looked at the extension of the inner race and cage. Andy, being fresh off the Rubics CV puzzle said he thought they extended further than he had seen before.

Those CV's were disassambled/machined and then reassembled. We wondered if the inner race may have been installed the same upon reassembly. I don't believe we ever got the answer to that but, after digging into it we felt it was just a fluke.

We now machine the CV's assembled and tape the entire surface to avoid metal shavings etc. I've checked the CV's out of the box and they don't seem to hyperextend.

Bottom line: With a 2% failure rate and given the application of serious autocrossing with slicks etc. I'm not sure which way to go here... I want to know what happened so we can asses if this will be a future problem but, I don't see this as somthing that will affect others.

There have been some really good answers herein as well. You could get larger CV's (Bus axles, 911 axles w/spacers etc.) but, CV's are relatively cheap compared to transmissions.

PM me your info and I'll send another CV kit out today N/C. (IMG:style_emoticons/default/wink.gif) Make sure you use all the grease and torq everything properly etc. Sounds like this may have been another one-off (hoping).

E.

P.S. Silence Jeff! Back to that welding thing you do... now! (IMG:style_emoticons/default/tongue.gif)