Thinking this will probably be my spring, comp 918s, to upgrade the stockers on my stock BLOWN LS6 motor in my 02 Z06.

If you broke one or have knowledge of someone breaking one, what were the cam specs, etc., and how long ago did this happen!


THANKS GUYS!!!!!!

 

Have not heard of any 918 failures with that lift - did you do a search?

 

I am not sure as the person might of lied, but the previous owner of my car claimed he broke a 918 valve spring with a 224/224 cam. I am prety sure the lift was under .590.

 

Unless its was a custom grind I think its safe to say that the lift on that cam was probably at or lower than .581. 918's are rated to .600 lift, and can probably reliably hold .615ish. So unless the springs were just very worn, or used on a more aggressive cam before, I'd say somethings up, but who knows, may have just got a weak spring.

 

Ditto. The 918's were originally advertised as .615" lift but miraculously when Comp came out with their 921's, they suddenly down rated them to .600". If setup properly there is no reason why the 918's will be even close to bind at .600" lift.

Nate

 

I think whhat he is asking is that would the 918's make a good replacement on his Z06 blown motor.
Yes. But get the titanium retainers.

 

When I was on Power Tour last summer, they were using the old advertisements stating .625 lift. I went with the Patriot Golds with my MS3 for piece of mind, but when I need to swap out springs later on I will be putting 918s in. You should have no problem with .590 lift.

 

Why will you go back to the 918s over the Patriot Golds.

Tuff decision for me between these two springs for a replacement spring on my stock blown LS6 motor, as i just don't have alot of faith in my stock LS6 srpings, although i have had no issues so far!

 

I usually have good luck with 918's, allthough my freind with a 2500HD just had one brake and destroy a motor with a whimpy little cam. 220/224 572/577 on a 114+4.

 

GREAT that's all i needed to here. Leaning toward the Patriot dual golds now!

 

I'm sure that's the exception and not the rule. I run 918s on my setup (224/228 581/588 114+2). No problems.

 

patriot gold duals

 

We have NEVER had a comp 918 break since they were revised with the "Blue Stripe" and we have used them on almost all H/C amd cam only set ups

if someone is breaking them usually it is due to improper set up

 

Whats a 2500HD, anybody?

 

truck

 

The million dollar question is that although i know the 918s are a great single spring and make A TON of sense for my application, i REALLY prefer the safety net of the second spring offered on the Patriot dual golds and want to run a DUAL spring, but on a stock BLOWN LS6 motor, is the Patriot dual golds too much spring, that will screw something up on my set-up which has proven to be reliable after 3400 miles!!

 

With a blown setup and it being a nice lightweight valved LS6, why would annyone suggest to run heavy duals.
918's are some of the best springs out there and even more so with LS6 light valves.
Don't listen to phobias, do what is right by applying proper technology.
918s are that tech.

 

More information needed. How many miles were on them when it broke. Was it the older design (non blue stripe). Miss a shift? Floated the valves?

You can't just throw a bomb like that without enough information to determine what happened. Everything I have seen on these springs is that they are reliable unless abused or run for many miles on a hard setup. But most springs will have problems then.

 

QUESTION: The patriot gold dual kits come with titanium retainers and would be using them is i went this route. Is this still considered a HEAVY DUAL spring with the titanium retainers vs 918s without titanium retainers?

 

Oh yeah, no comparison.
Heavy springs have an overall effect on what is called "Effective moving valvetrain mass"
In a nuttshell, the lighter that mass is, the better harmonics, more power and less chance of valvefloat you get, providing all components are matched.
The 918s will have enough seat pressures to shut your valves, better harmonics, lighter mass, so you'll still benefit from those light valves.
I wouldn't even think twice about it.