Here is the problem.
Have a 383 solid roller with a custom Lazer Cam.
I went to adjust the valves and i noticed that 3 springs were broken (the outside coils). The springs were comp cams 999. I was wondering what might have caused the springs to brake..also what springs would you guys recommend to put on it. I am looking for a spring that i could reuse the titanium retainers (comp cams 732). Should i just get the 999 springs again? Let me know
Thanks
Marcin

 

To close to coil bind at max lift maybe. Did you spec out the springs before they were installed?

 

Marcin,
I've had good luck with the comp Pacalloy's, 943's. They are pricey, but I'm also running a solid roller, comp 25x/26x duration at .050, but are supposedly a new metal alloy that comp has designed and tested to be much more durable on more aggressive cams.

BTW, you have mail on the solid roller lifters.

 

These springs are 196 lb @ 1.9 installed and a 633 lb/in rate. At .636 lift that's nearly 600 over the nose. Just how high are you twisting this engine?

Maybe it's time to have a cam guy look at your valvetrain.

 

I have not reved it past 6800 Deffective batch of springs? Should i go ahead and get the 999 springs again or try something new?
Thanks

 

What springs did the cam company recommend with your setup?

Maybe it's time to have a cam guy look at your valvetrain. I'm not a cam guy, but those springs seem awfully heavy for 6800.

My $.02.

 

Something is causing that outer spring to break.

What's the advertised duration, .200 duration and is that lift with 1.5 rockers?

How much spring did they recomend for the cam for seated pressure and over the nose?

Bret

 

the lift is with 1.6 rockers..ill look at the cam card when i get home, ill probably give them a call to. Ill post more info later.

 

How far from coil bind are you?

I don't think the springs are too much. I usually like to see ~200 lbs after they take a set. A little more is always better than a little less.

I don't use Comp's springs for solid rollers though. Don't know if it's just a recent QC problem or not but alot of guys seem to be having problems with them.

My choice for springs is Isky Toolroom, LSM, PSI or Manley Nextek. Don't skimp here.

Either way... your problem doesn't sound like faulty springs... sounds like a coil bind problem. Either that or the cam's tossing lifters or flat out upsetting those springs.

-Mindgame

 

Wouldnt it ease your problems if you switched to 1.5 rockers and lower the lift a little?

 

I usually run Crower but ya have to have a 2.0 installed height to run the same spring.
With a cam that size They would be about 235 seat and about 735 nose. Ya will gain more by TOO much spring than not enough.
I have replaced several sets of Comp spring's in the last year due to breakage.

 

We need to know what your installed height is, if those springs spec out at 200# at 1.900" you easily could have them close to coil bind and too much pressure if you don't have +.100 valves or a combination with + .050" keepers etc. I set solid rollers up at 190-210# seat and 540-575 open in a SBC. So depending on your installed height the pressures are right. You need a rev kit too, I never run solid rollers without a rev kit.

I agree on the Isky springs, I use the toolroom and the endurance 9000. We have a customer with a blown '97 SS who has managed to break on a couple different occasions those manley nextek springs, he has a rev limiter, but maybe he's missing shifts or something...other than that one car I have not used the manley springs except in harley davidsons.

 

The Comp 999 is a 1.55 OD H-11 dual spring assy. Installed at 1.90 it has 196 lbs. and a recommended max lift of .700. Coil bind is 1.09 or .81 from the recommended installed height. Don't think coil bind is the problem here unless they are installed with about 300 lbs of seat load.

The 999s are a little more expensive than the 943 PacAlloys, so we're not talking chump change cheapies. That seems like a lot of spring ($ wise) for a 6800 rpm SR. I'm not the cam guy, so it's just my opinion. I'd look elsewhere for bad harmonics, etc.but first I'd ask the cam manufacturer for a spring recommendation. If it was the 999's I'd ask them more questions about my failure.

My $.02

 

We do need to know your installed height first. We use Isky tool rooms on our DIRT BB Chevys. They are pricey but I have only seen a hand full break. I also agree a rev kit is needed.

 

Ever notice how many people know what springs they have but not their installed height? It's difficult to get anywhere near that tall an installed height (1.90") with stock length valves in stock heads. I looked at his website and it doesn't mention anything about aftermarket heads or modifications to the stock ones so.......

And boy, that sure does seem to be an awful stiff spring for 6800 RPMs. How close is it to the spring recommended for that cam?