Comp Cams 918 spring broke......
06-10-2007, 07:51 PM
#61
Originally Posted by vettenuts
The 120# @1.800" is simply a rating. Dart installed them at 1.750 so they are about 140# on the seat. The number at 1.800" doesn't mean much, it only gives you a base point from which to determine the required installed height for proper seat loading. There is probably no one on this forum running springs at 1.800", not even the stock springs are set up at that height, they come it at about 1.760". The difference between the PSI and the Comps is the much higher spring rate at 384 lb/in. 
06-10-2007, 09:37 PM
#62
On The Tree
iTrader: (4)
Join Date: Apr 2006
Location: CA
Posts: 188
Likes: 0
Received 0 Likes
on
0 Posts
Well add me to the list. I broke at least 3 as far as I can see without taking them off. I did take one off, the one in the pic. My batch # is 049826. Dunno if the zero in front matters or not. I put about 3k on these springs with the small TR224 cam, and NEVER got on the springs when the engine was not at full operating temp.
06-10-2007, 09:51 PM
#64
TECH Regular
iTrader: (8)
Join Date: Jul 2006
Location: Costa Mesa, CA
Posts: 457
Likes: 0
Received 0 Likes
on
0 Posts
Where the hell is Comp Cams? I thought someone contacted them about this problem, they should have a representative on here already. I'm scared to use my 918's now and I wish I had gone with the Gold duals in the first place but I didn't because I was told they were too much spring for my TR230.
Damn't this is frustrating.
Damn't this is frustrating.
06-10-2007, 10:42 PM
#67
My 918 experience has been a little better that yours..They were installed with a GT2-5 cam back in '05..They have a long haul power tour under their belt with a few 7 k pulls thrown in for good measure.The cam is a 222/222 .582 lift using comp pro magnum 1.75 roller rockers.I sold them 6 months ago & they are still in use on a '04 goat..
Comp sells ALOT of 918's...More don't break than do..
You never hear about the ones that don't.
My personal customer expeirence with Comp has been fantastic..They warranted out my FAST 90 mm TB while on the power tour (it was sticking open).I just walked up to the COMP tent & told them my problem.Their rep went & looked at the car.He then arranged to have a new TB sent to the next stop.
Recently ,I had a comp R lifter **** a retainer..They sent me a new set of lifters no questions asked.So from a customer service stand point,I've had nothing but good luck.
Comp sells ALOT of 918's...More don't break than do..
You never hear about the ones that don't.
My personal customer expeirence with Comp has been fantastic..They warranted out my FAST 90 mm TB while on the power tour (it was sticking open).I just walked up to the COMP tent & told them my problem.Their rep went & looked at the car.He then arranged to have a new TB sent to the next stop.
Recently ,I had a comp R lifter **** a retainer..They sent me a new set of lifters no questions asked.So from a customer service stand point,I've had nothing but good luck.
06-10-2007, 11:40 PM
#68
Originally Posted by BYE RICE
My 918 experience has been a little better that yours..They were installed with a GT2-5 cam back in '05..They have a long haul power tour under their belt with a few 7 k pulls thrown in for good measure.The cam is a 222/222 .582 lift using comp pro magnum 1.75 roller rockers.I sold them 6 months ago & they are still in use on a '04 goat..
Comp sells ALOT of 918's...More don't break than do..
You never hear about the ones that don't.
My personal customer expeirence with Comp has been fantastic..They warranted out my FAST 90 mm TB while on the power tour (it was sticking open).I just walked up to the COMP tent & told them my problem.Their rep went & looked at the car.He then arranged to have a new TB sent to the next stop.
Recently ,I had a comp R lifter **** a retainer..They sent me a new set of lifters no questions asked.So from a customer service stand point,I've had nothing but good luck.
Comp sells ALOT of 918's...More don't break than do..
You never hear about the ones that don't.
My personal customer expeirence with Comp has been fantastic..They warranted out my FAST 90 mm TB while on the power tour (it was sticking open).I just walked up to the COMP tent & told them my problem.Their rep went & looked at the car.He then arranged to have a new TB sent to the next stop.
Recently ,I had a comp R lifter **** a retainer..They sent me a new set of lifters no questions asked.So from a customer service stand point,I've had nothing but good luck.
And comp sending new springs because one broke and dropped a valve in your motor ruining your whole longblock really won't help at all. 
06-10-2007, 11:41 PM
#69
Teching In
Thread Starter
Join Date: Jan 2007
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
I tried to call Comp on friday morning. I had to leave a message and haven't heard from them yet. I know they are closed for the weekend, hopefully I'll hear from them monday.
06-11-2007, 12:23 AM
#70
Originally Posted by speed_demon24
Re-read the thread, the problem is with 918's that were recently bought since comp changes suppliers (last 6-12 months). The older ones are fine. And comp sending new springs because one broke and dropped a valve in your motor ruining your whole longblock really won't help at all.
And comp sending new springs because one broke and dropped a valve in your motor ruining your whole longblock really won't help at all. BTW..Broken valve springs are not excusive 918 territory.I know someone who broke a PRC dual on an MS4...I know personally two people who have broken 918's..My father & the guy with the spice red goat (The Rock on ls1 GTO.com)..My dads 918 just cracked a coil & didn't know until the heads came off for another reason..The goat dropped a valve & destroyed the longblock...The car had less than 36K on it sooo....that motor got covered.
Here's a post form someone who does know a thing or two:
Originally Posted by JRP
1. Comp 918’s: A few years back they had some problems with non-blue stripe springs breaking but they have rectified the problem. The beehive design is also a superior setup due to there light weight and harmonics.. Your stock steel retainers can be reused with the 918’s but titanium retainers are recommended for lightening up the valvetrain and for strength.
Outside Diameter (O.D.): 1.290"/1.060"
Inside Diameter (I.D.): .885"/.656"
Installed Pressure: 130 lbs @ 1.800"
Open Pressure: 318 lbs @ 1.200''
Coil Bind: 1.085"
Maximum Lift: 0.625"
Rate (lbs/in): 313 lbs/in
Outside Diameter (O.D.): 1.290"/1.060"
Inside Diameter (I.D.): .885"/.656"
Installed Pressure: 130 lbs @ 1.800"
Open Pressure: 318 lbs @ 1.200''
Coil Bind: 1.085"
Maximum Lift: 0.625"
Rate (lbs/in): 313 lbs/in
Last edited by BYE RICE; 06-11-2007 at 12:32 AM.
06-11-2007, 03:24 AM
#71
TECH Fanatic
Join Date: Oct 2003
Location: Long Island, NY
Posts: 1,514
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 916LS1
Well add me to the list. I broke at least 3 as far as I can see without taking them off. I did take one off, the one in the pic. My batch # is 049826. Dunno if the zero in front matters or not. I put about 3k on these springs with the small TR224 cam, and NEVER got on the springs when the engine was not at full operating temp.
06-11-2007, 06:11 AM
#74
Originally Posted by Fibbado
I'm scared to use my 918's now and I wish I had gone with the Gold duals in the first place but I didn't because I was told they were too much spring for my TR230.
06-11-2007, 10:14 AM
#75
Banned
iTrader: (5)
Join Date: Apr 2003
Location: Chicago
Posts: 1,890
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by speed_demon24
Those springs with only 120 lbs on the seat controlled your valves? When i had 918's installed at 1.8" I was getting valve float at 5800. I had to shim them down to 1.75" to control the valves.
I had to shim them down to 1.75" to control the valves.Theirs a certain dual spring we run on LT1, rather common to have valve float issues with them.
06-11-2007, 11:20 AM
#77
Originally Posted by Fraser@SpeedInc
On an LT1?
Theirs a certain dual spring we run on LT1, rather common to have valve float issues with them.
Theirs a certain dual spring we run on LT1, rather common to have valve float issues with them.
06-11-2007, 11:59 AM
#79
Staging Lane
iTrader: (1)
Join Date: May 2005
Location: Overland Park, KS
Posts: 61
Likes: 0
Received 0 Likes
on
0 Posts
I'm really worried to start my car up now. I just had the Torquer V.2 installed and used 918s (they do have the blue stripe) and last night I had it dynoed. It put down 363 whp!!! We cannot figure out what the hells wrong with it!?!?!?
06-11-2007, 12:02 PM
#80
TECH Addict
iTrader: (10)
Join Date: Jun 2004
Location: Commerce Twp, MI
Posts: 2,918
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by LastPewterZ
I'm really worried to start my car up now. I just had the Torquer V.2 installed and used 918s (they do have the blue stripe) and last night I had it dynoed. It put down 363 whp!!! We cannot figure out what the hells wrong with it!?!?!?