2006 LS2 Engine Destroyed--Comp Valve Spring 26918
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Teching In
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2006 LS2 Engine Destroyed--Comp Valve Spring 26918 Did a valve job and changed cam on 2006M to a Comp Cam 269LR HR-112-219/227 with .607/.614 lift. Used Comp Cam Springs 26918. After 9000 miles, the spring broke on #4 Exhaust, dropped the valve destroying the piston and punching a hole thru the liner. All of the piston is now in the bottom of the pan. This all happened at low rpm.
Comp now says I used the wrong springs even though you see these springs used in magazine articles with this exact cam and other cams with even more lift/duration. Engine is a total loss. See attached pictures
Comp now says I used the wrong springs even though you see these springs used in magazine articles with this exact cam and other cams with even more lift/duration. Engine is a total loss. See attached pictures
Did a valve job and changed cam on 2006M to a Comp Cam 269LR HR-112-219/227 with .607/.614 lift. Used Comp Cam Springs 26918......Comp now says I used the wrong springs even though you see these springs used in magazine articles with this exact cam and other cams with even more lift/duration.......
More than likely, the magazines used the springs they had sitting on the shelf in their shop.
There's more to matching cam lobes to valve springs than simply lift. Spring rate and lobe characteristics also come into play.
According to the Comp Cams catalog, Beehive Springs are not the recommended valve springs for this cam. Took me all of five minutes to look this cam up in their catalog and the recommended valve springs for this cam are their part #26926. See page 170-171 of the link below.
http://www.compcams.com/Company/CC/C...P/Default.aspx!
Bottom line.......OP used the wrong spring and bares the responsibility for his engine being fragged.
KW
Last edited by KW Baraka; May 16, 2017 at 04:10 PM.
Sorry to hear about the loss of your engine. It really sucks that happened.
The two spring kits in question do appear to be different.Installed Height (in):1.800 in.
Installed Height (in):1.835 in.
The two spring kits in question do appear to be different.
COMP Cams 26918TSKIT - COMP Cams High Performance Valve Spring Kits
Installed Height (in):1.800 in.
Seat Pressure at Installed Height (lbs):125 lbs.
Open Height (in):1.150 in.
Open Pressure (lbs):367 lbs.
COMP Cams 26926TS-KIT - COMP Cams High Performance Valve Spring Kits
Installed Height (in):1.835 in.
Seat Pressure at Installed Height (lbs):129 lbs.
Open Height (in):1.160 in.
Open Pressure (lbs):470 lbs.
TECH Resident
Joined: Apr 2010
Posts: 926
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From: Central Texas
Forget it, Comp won't even step up and fix their trunion needle bearing up grade fiasco. They are a BIG company who don't give a **** about us small guy rodders who buy their parts and expect quality only to get Chinese crap...
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I always heard that anything over .580 lift maybe .600 max depending on the type of lobes, you should always run dual springs. I remember a few years back Comp had major issues with their 918 springs breaking, wonder if the same problem is going on.
Based on the information we have at hand it appears this is a case of using the wrong spring for the application. Installer or build errors aren't on Comp Cams. The recommend spring wasn't used. The spring pressures for the two springs are posted above.
I've ran Comp Cam 987 Springs on an Comp Cam's 224 XER cam for over 127,000 miles with no issues and only a couple of spring changes. Ran Comp Parts in several cars no issues - but the installs were done correctly.
That reads like libel or slander without specific facts to back it up.
I've ran Comp Cam 987 Springs on an Comp Cam's 224 XER cam for over 127,000 miles with no issues and only a couple of spring changes.
Ran Comp Parts in several cars no issues - but the installs were done correctly.
I've ran Comp Cam 987 Springs on an Comp Cam's 224 XER cam for over 127,000 miles with no issues and only a couple of spring changes.
Ran Comp Parts in several cars no issues - but the installs were done correctly.
When you use the parts AS DIRECTED, there should be no issues!
KW
No.....why would you ask such a silly question?
What it means is that anyone running an aftermarket cam, needs to follow the cam's manufacturer's recommendation to use the appropriate spring for that cam OR a spring with the general specs of the one that was recommended.
With the OP's cam, Comp specifically disqualifies any of their beehives as appropriate. The also state the appropriate spring (#26926) for the cam.
Any spring, comparable to the 26926 spring would obviously do....whether it's from Comp or not.
KW
What it means is that anyone running an aftermarket cam, needs to follow the cam's manufacturer's recommendation to use the appropriate spring for that cam OR a spring with the general specs of the one that was recommended.
With the OP's cam, Comp specifically disqualifies any of their beehives as appropriate. The also state the appropriate spring (#26926) for the cam.
Any spring, comparable to the 26926 spring would obviously do....whether it's from Comp or not.
KW
sadly that could have been a lot worse and it made it 9000 miles, I'm sure with some high Rpm fun... details always cause issues. Remember magazine articles as stated, don't use the recommend parts always and only have to survive the dyno pull and post some numbers, assuming a stock piston which would have been worse had this been a forged piston... could resleeve the block provided dis-assembly shows sleeve was the only hard damage and rebuild and go again! Being optimistic