what the hell is going on with Comp 918s????
06-15-2007, 11:31 AM
#121
http://www.lxforums.com/board/showth...t=68960&page=2
Apparently we have an expert in here, he was going to post on here as well, but he is yet to be seen.
He thinks the cams were too big for the springs, but I think someone has broken them with a stock cam correct??
Apparently we have an expert in here, he was going to post on here as well, but he is yet to be seen.
He thinks the cams were too big for the springs, but I think someone has broken them with a stock cam correct??
06-15-2007, 01:06 PM
#122
Originally Posted by pwrtrip75
on the corvette forum ones.....i'd lean towards something else was wrong. Did the springs ever get baked? who put the springs on and the rest of the engine together?
10 broken springs I think is the result of something other than the springs being 100% at fault. what was the lift? shims? stock rockers? pushrods? heads milled? anything altered from stock? Theres got to be something else.
10 broken springs I think is the result of something other than the springs being 100% at fault. what was the lift? shims? stock rockers? pushrods? heads milled? anything altered from stock? Theres got to be something else.
.I will agree it seems awfully strange to see it happening to so many people in the same spot on the spring every time...but there are a LOT more out there that aren't seeing this problem at all...nobody posts a new thread every 10K miles just to say "hey, my valve springs are still not broken".
06-15-2007, 01:45 PM
#123
Originally Posted by TKAYRC3
My 918 Spring brokeon my 02 T/A, yesterday, I dropped a valve, broke a rod & cracked an LS6 block & destroyed one cylinder head, Do you think comp is gonna pay for that!! I had a TR 224 cam with stock heads!! I'm screwed!!
I caught my busted 918's before any valves dropped.
06-15-2007, 02:38 PM
#124
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Originally Posted by wrd1972
I caught my busted 918's before any valves dropped.
06-15-2007, 04:39 PM
#125
My rep at Comp just called and someone there wants to speak with someone with a broken spring....not in e-mail, not hearse on the net...they want to talk with someone. If you've actually got a broken spring, please call me so I can get your contact info and I'll have Comp call you directly.
Sorry I don't know more of what they want to talk about...he just asked me to get them in contact directly with someone. I'm here until 6:30pm central...800-456-0211 and just ask for Matt.
Thanks!
Sorry I don't know more of what they want to talk about...he just asked me to get them in contact directly with someone. I'm here until 6:30pm central...800-456-0211 and just ask for Matt.
Thanks!
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06-15-2007, 04:56 PM
#126
Thanks Dr. Jeckyl!
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WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice
800-456-0211 / PM / Facebook
WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice
06-16-2007, 10:55 AM
#128
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Originally Posted by speed_demon24
Or maybe its has to do with the fact that comp switched spring suppliers. 
06-18-2007, 09:58 AM
#129
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It has everything to do with Comp switching suppliers. The batch numbers I have seen comfirm this.
Comp switched manufacturers from Peterson Spring (PAC Racing) in early 2006 to one of our competitors. We made the original 918.
You can get the original 918 still through us. The new part number is PAC-1218.
We also ahve a bunch of other really cool LS1 stuff. Like the next evolution of the 918. The PAC-1518.
Feel free to ask me any questions. I run PACs valvetrain dynamics lab.
Please spread the word as we can't hit all the websites to warn people.
If the batch number is 29XXX and lower you have the older 918s from us. Anything else and you have the newer ones that appear to be failing.
Comp switched manufacturers from Peterson Spring (PAC Racing) in early 2006 to one of our competitors. We made the original 918.
You can get the original 918 still through us. The new part number is PAC-1218.
We also ahve a bunch of other really cool LS1 stuff. Like the next evolution of the 918. The PAC-1518.
Feel free to ask me any questions. I run PACs valvetrain dynamics lab.
Please spread the word as we can't hit all the websites to warn people.
If the batch number is 29XXX and lower you have the older 918s from us. Anything else and you have the newer ones that appear to be failing.
Last edited by Yeahdoug; 06-18-2007 at 12:35 PM.
06-18-2007, 11:29 AM
#130
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Oh and I am trying to do this without soliciting as much as possible but it's hard not too. I think that this problem is large/important enough that this infomation is valid. I took out any contact info.
Last edited by Yeahdoug; 06-18-2007 at 11:40 AM.
06-18-2007, 12:42 PM
#131
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Call Crane!!!
Originally Posted by Yeahdoug
It has everything to do with Comp switching suppliers. The batch numbers I have seen comfirm this.
Comp switched manufacturers from Peterson Spring (PAC Racing) in early 2006 to one of our competitors. We made the original 918.
You can get the original 918 still through us. The new part number is PAC-1218.
We also ahve a bunch of other really cool LS1 stuff. Like the next evolution of the 918. The PAC-1518.
Feel free to ask me any questions. I run PACs valvetrain dynamics lab.
Please spread the word as we can't hit all the websites to warn people.
If the batch number is 29XXX and lower you have the older 918s from us. Anything else and you have the newer ones that appear to be failing.
Comp switched manufacturers from Peterson Spring (PAC Racing) in early 2006 to one of our competitors. We made the original 918.
You can get the original 918 still through us. The new part number is PAC-1218.
We also ahve a bunch of other really cool LS1 stuff. Like the next evolution of the 918. The PAC-1518.
Feel free to ask me any questions. I run PACs valvetrain dynamics lab.
Please spread the word as we can't hit all the websites to warn people.
If the batch number is 29XXX and lower you have the older 918s from us. Anything else and you have the newer ones that appear to be failing.
The PAC-1218 is also available from Crane Cams Inc. under Crane part number 99831-16.
06-18-2007, 01:46 PM
#133
Originally Posted by Yeahdoug
It has everything to do with Comp switching suppliers. The batch numbers I have seen comfirm this.
Comp switched manufacturers from Peterson Spring (PAC Racing) in early 2006 to one of our competitors. We made the original 918.
You can get the original 918 still through us. The new part number is PAC-1218.
We also ahve a bunch of other really cool LS1 stuff. Like the next evolution of the 918. The PAC-1518.
Feel free to ask me any questions. I run PACs valvetrain dynamics lab.
Please spread the word as we can't hit all the websites to warn people.
If the batch number is 29XXX and lower you have the older 918s from us. Anything else and you have the newer ones that appear to be failing.
Comp switched manufacturers from Peterson Spring (PAC Racing) in early 2006 to one of our competitors. We made the original 918.
You can get the original 918 still through us. The new part number is PAC-1218.
We also ahve a bunch of other really cool LS1 stuff. Like the next evolution of the 918. The PAC-1518.
Feel free to ask me any questions. I run PACs valvetrain dynamics lab.
Please spread the word as we can't hit all the websites to warn people.
If the batch number is 29XXX and lower you have the older 918s from us. Anything else and you have the newer ones that appear to be failing.
06-18-2007, 02:03 PM
#135
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Originally Posted by wrd1972
What is the big diffrence between the 1218 and the 1518 springs. I have the 1218 springs and I was wondering at what point they should be replaced regarding certain amounts of lift.
We recommend our PAC-1518 for anything above .600" to .650" lift because of the higher stress range. It's also a better spring for engines that will be turning higher RPMs or using a camshaft with aggressive ramps. The nitriding and other added processes we do give the springs even better fatigue life then the 1218 and can handle more punishment. I have ran the 1518 from free length to solid on our testers and haven't been able to break one after double our normal test length.
The 1518 is the next evolution of the 1218 (918). It gets a lot of the same processing that our cup springs do
06-18-2007, 02:59 PM
#136
Originally Posted by Yeahdoug
We recommend our PAC-1518 for anything above .600" to .650" lift because of the higher stress range. It's also a better spring for engines that will be turning higher RPMs or using a camshaft with aggressive ramps. The nitriding and other added processes we do give the springs even better fatigue life then the 1218 and can handle more punishment. I have ran the 1518 from free length to solid on our testers and haven't been able to break one after double our normal test length.
The 1518 is the next evolution of the 1218 (918). It gets a lot of the same processing that our cup springs do
The 1518 is the next evolution of the 1218 (918). It gets a lot of the same processing that our cup springs do
Thanks
06-18-2007, 03:08 PM
#137
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Originally Posted by SideStep
??? Do these come with retainers? If so, what type???
Thanks
Thanks
Sorry they don't
, we're working on a package right now, but for retainers you will have to use Comp/Crane/Manley etc. Whatever fits the 918/1218s will fit the 1518s. 
Retainers 
