CompCam 941 broken
Thread Starter
Instructor
Joined: Dec 2000
Posts: 218
Likes: 0
From: Columbus Indiana
CompCam 941 broken
Yepper....
This is the 2nd CC941 valve spring that has broken on my Z. :yesnod:
Installed height etc. has nothing to do with the problem because Katech
Balance and blue Printed the engine with new Heads.
The springs simply don't fit the application...
The guys at Katech are going to send me a complete set of CC918 springs
free of charge...now all I have to do is install them :thumbs:
This is the 2nd CC941 valve spring that has broken on my Z. :yesnod:
Installed height etc. has nothing to do with the problem because Katech
Balance and blue Printed the engine with new Heads.
The springs simply don't fit the application...
The guys at Katech are going to send me a complete set of CC918 springs
free of charge...now all I have to do is install them :thumbs:
Thread Starter
Instructor
Joined: Dec 2000
Posts: 218
Likes: 0
From: Columbus Indiana
Re: CompCam 941 broken (C5Noir)
C5Noir,
The CC941, I'm being told is still a great spring for other applications,
The 7L C5R for example...Just not my engine / cam setup.
Katech is sugesting the CC918 for my cam... :cheers:
[Modified by BLACK/BLACKZ06, 5:00 PM 1/8/2003]
The CC941, I'm being told is still a great spring for other applications,
The 7L C5R for example...Just not my engine / cam setup.
Katech is sugesting the CC918 for my cam... :cheers:
[Modified by BLACK/BLACKZ06, 5:00 PM 1/8/2003]
Thread Starter
Instructor
Joined: Dec 2000
Posts: 218
Likes: 0
From: Columbus Indiana
Re: CompCam 941 broken (BLACK/BLACKZ06)
Emailed questions to CompCam concerning 941 breakages for my application...
The reply:
"Douglas,
There probably isn't anything wrong with the 941 valve spring, but sometimes with an aggressive lobe with alot of lift a single valve spring does get "overworked" to the point of breakage. The 26918 spring is designed for a more aggressive lobe and works with lifts up to .600 lift and is very stable to that point. The only downfall to using the 26918 spring in your application is that the retainer for the 941 spring will not fit the 26918 spring. "
:seeya
The reply:
"Douglas,
There probably isn't anything wrong with the 941 valve spring, but sometimes with an aggressive lobe with alot of lift a single valve spring does get "overworked" to the point of breakage. The 26918 spring is designed for a more aggressive lobe and works with lifts up to .600 lift and is very stable to that point. The only downfall to using the 26918 spring in your application is that the retainer for the 941 spring will not fit the 26918 spring. "
:seeya
Le Mans Master
Joined: Nov 2000
Posts: 7,391
Likes: 3
From: Chandler AZ
Re: CompCam 941 broken (BLACK/BLACKZ06)
Couple of things I'm wondering...
We have a set of heads in the shop from a customer that had the 941's. The customer had a broken spring... and the valve dropped enough to slap the piston. When we disassembled the heads that particular spring was in 4 different pieces. The dampner was in 2 pieces... with part of it hanging out... making me wonder if the intial failure was the dampner. We also found 4 more busted springs. Upon closer examination we found that there was severe wear on the underside of all the Titanium retainers... from the dampners. My thoughts are I wonder if the spring/dampner/retainer were ever properly matched... with the spring itself receiving the bad rap because a dampner busted, for one reason or another, taking out the spring when it got inbetween the spring coils?... just a thought.
Nice to hear you are being taken care of... I take it the broken spring caused no other damage?
:cheers:
[Modified by billreid1@***.net, 7:52 PM 1/13/2003]
We have a set of heads in the shop from a customer that had the 941's. The customer had a broken spring... and the valve dropped enough to slap the piston. When we disassembled the heads that particular spring was in 4 different pieces. The dampner was in 2 pieces... with part of it hanging out... making me wonder if the intial failure was the dampner. We also found 4 more busted springs. Upon closer examination we found that there was severe wear on the underside of all the Titanium retainers... from the dampners. My thoughts are I wonder if the spring/dampner/retainer were ever properly matched... with the spring itself receiving the bad rap because a dampner busted, for one reason or another, taking out the spring when it got inbetween the spring coils?... just a thought.
Nice to hear you are being taken care of... I take it the broken spring caused no other damage?
:cheers:
[Modified by billreid1@***.net, 7:52 PM 1/13/2003]
Melting Slicks
Joined: Jun 2001
Posts: 2,743
Likes: 3
From: Davie Florida
Re: CompCam 941 broken (C5Noir)
Stay away from those springs. Go with Comp 987 Duals. The 941s have a horrible record for breaking :(
Go with a dual spring setup Rev 1116 dual springs will fit your heads without the heads being machined. If memory serves they are good up to a cam with .620 lift. As mentioned above Comp 987 Duals are also a good choice, but I believe the heads have to be machined.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Instructor
Joined: Dec 2000
Posts: 218
Likes: 0
From: Columbus Indiana
Re: CompCam 941 broken (billreid1@***.net)
Bill,
Guess I was lucky 2 times in a row...the springs broke just after start up and no other damage....the 1st time Katech actually tore the engine down completly to inspect...2nd time just replaced the broken CC941 with another CC941. Hopefully within a few days Katech will ship me the CC918 and that will be the end of spring breakage :hurray:
The titanium retainers etc. looked fine...
Guess I was lucky 2 times in a row...the springs broke just after start up and no other damage....the 1st time Katech actually tore the engine down completly to inspect...2nd time just replaced the broken CC941 with another CC941. Hopefully within a few days Katech will ship me the CC918 and that will be the end of spring breakage :hurray:
The titanium retainers etc. looked fine...
Melting Slicks
Joined: Mar 2001
Posts: 2,372
Likes: 51
From: New Milford CT
Re: CompCam 941 broken (BLACK/BLACKZ06)
What did the engine sound like when and after the spring broke?
I have heard people say that sometimes it is not obvious that it broke, and they kept driving making it worse.
[Modified by CJS, 8:11 PM 1/14/2003]
I have heard people say that sometimes it is not obvious that it broke, and they kept driving making it worse.
[Modified by CJS, 8:11 PM 1/14/2003]
Thread Starter
Instructor
Joined: Dec 2000
Posts: 218
Likes: 0
From: Columbus Indiana
Re: CompCam 941 broken (CJS)
The Engine was running 100% Then right after start up...crap...
Actually...when the springs broke both times, it was just a small misfire...but very obvious, Like a fouled plug....wouldn't sugest driving it very far. :seeya
A compression test on the cylinder flat lined :rofl:
Actually...when the springs broke both times, it was just a small misfire...but very obvious, Like a fouled plug....wouldn't sugest driving it very far. :seeya
A compression test on the cylinder flat lined :rofl:
Thread Starter
Instructor
Joined: Dec 2000
Posts: 218
Likes: 0
From: Columbus Indiana
Re: CompCam 941 broken (BLACK/BLACKZ06)
Received the CC918 springs and installed them today :cheers:
Sounds and runs great...
Installed height, Max crush etc looked pretty good.
Ran the engine up to temp and let cool down not to exceed 2000 RPM a couple of times as sugested...everything to the book.
Now....please no more broken springs :steering:
Sounds and runs great...
Installed height, Max crush etc looked pretty good.
Ran the engine up to temp and let cool down not to exceed 2000 RPM a couple of times as sugested...everything to the book.
Now....please no more broken springs :steering:
Drifting
Joined: Aug 2001
Posts: 1,696
Likes: 0
From: SANTA MARIA,CA. formerly Magnolia Texas
St. Jude Donor '08-'09
Re: CompCam 941 broken (BLACK/BLACKZ06)
Always make sure you have some heat in the engine before you start driving.Just an extra precaution.
Jerry
Jerry
