my intake cam snapped?!!?
Mar 16, 2009, 01:31 PM
#211
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There is a very simple solution here...send in a failed cam or two to a failure analysis lab. Done.
Fatigue can be verified by simple fractography and confirmed by high magnification under an SEM. A qualified lab can do all of this as well as test the alloy composition and look for defects, etc. Not only can a lab verify if this was a fatigue failure or not, they can verify the crack initiation point(s).
I think simply sending a couple of the broken cams to a qualified lab will get the quickest results and real cause of the failures.
Fatigue can be verified by simple fractography and confirmed by high magnification under an SEM. A qualified lab can do all of this as well as test the alloy composition and look for defects, etc. Not only can a lab verify if this was a fatigue failure or not, they can verify the crack initiation point(s).
I think simply sending a couple of the broken cams to a qualified lab will get the quickest results and real cause of the failures.
I Totally agree, maybe one day someone will send us a camshaft that has broken this way.
As of today we still have not recieved one. Only photos and e mails directing us to this discussion.
We have an avaiation industry metalurgical lab in town here that we use for analysis.
Mar 16, 2009, 01:48 PM
#212
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This is not one of our cams, but the information was sent to me for review.
This is why I make the statement that if we strengthen the radius, whatever is causing high load can result in a breakage at the next weakest link which has proven to be the oil hole cross drilling in the next groove..
We are working on a solution to strengthen this area also.
Mar 16, 2009, 03:27 PM
#214
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Hey guys I got a response from GSC
We have only had one known failure and to reproduce this type of failure
took and excess amounts of force. At this time we can't tell 100% as to the
failures cause. We have broken a couple of cams to try and simulate the
break and have only been able to do so out of excess force.
If it's possible can you get me the batch id of your intake cam and I can
tell you if the ID is from the same batch as the failed camshaft.
Attached is a picture of where the batch id is on your camshaft.
Best Regards,
Greg Caloudas
Hes not saying what the bad batch number is but later this week I will send him the batch number of my cam and find out. Does some one know the batch number of the current broken cams?
We have only had one known failure and to reproduce this type of failure
took and excess amounts of force. At this time we can't tell 100% as to the
failures cause. We have broken a couple of cams to try and simulate the
break and have only been able to do so out of excess force.
If it's possible can you get me the batch id of your intake cam and I can
tell you if the ID is from the same batch as the failed camshaft.
Attached is a picture of where the batch id is on your camshaft.
Best Regards,
Greg Caloudas
Hes not saying what the bad batch number is but later this week I will send him the batch number of my cam and find out. Does some one know the batch number of the current broken cams?
Mar 17, 2009, 10:44 AM
#218
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Anybody compared batch numbers on broken GSC cams to prove the possibility of a bad batch....if its not a batch then more cams could break with fatigue....to the broken cam people, how many miles did you have the cams on for??
Mar 17, 2009, 10:49 AM
#219
Starting to doubt its simply a bad batch. Its a design and manufacturing flaw. With as few miles boths sets I had break, had on them. And being purchased in June and November from the same source. Takes the possibility of them being in the same batch. Supplier sold quite a few and was always out of stock.
Mar 17, 2009, 10:56 AM
#220
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Starting to doubt its simply a bad batch. Its a design and manufacturing flaw. With as few miles boths sets I had break, had on them. And being purchased in June and November from the same source. Takes the possibility of them being in the same batch. Supplier sold quite a few and was always out of stock.
thanks
Mar 17, 2009, 11:04 AM
#221
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Starting to doubt its simply a bad batch. Its a design and manufacturing flaw. With as few miles boths sets I had break, had on them. And being purchased in June and November from the same source. Takes the possibility of them being in the same batch. Supplier sold quite a few and was always out of stock.
Mar 17, 2009, 06:58 PM
#225
The fact that its delayed between install and failure seems to indicate its something right before install or at install. Something weakened the cam prior and after "x" amount of cycles the failure occurs. Some have pointed to shipping (I wouldnt say packaging so much as there are FAR WORSE examples) damage as a likely culprit.
Before this turns into a bunch of "i have friend whose brother knows a guy" type posts, if all those with failures would take a picture of the cam and batch number. Without some sort of proof there is no way to verify what batch or if it happened. So far so good, but I have seen a few posts that dont seem to be linked to any photos.
Before this turns into a bunch of "i have friend whose brother knows a guy" type posts, if all those with failures would take a picture of the cam and batch number. Without some sort of proof there is no way to verify what batch or if it happened. So far so good, but I have seen a few posts that dont seem to be linked to any photos.