Does anyone have an old Comp 987 valve spring that they can spare? I would like to do a coil bind test. Or can someone do a coil bind test? There seems to be a difference in what Comp says and others say the coil bind is.
_______

 

I think some of the coil bind depends on how the spring is set up with install height etc. I think (was last year so I'm not positive anymore) ~.595 to .600 or something like that was about the lift limit when we tested my set up.

 

I need to know the actual coil bind when the spring is completely collapsed.
Comp says that is 1.15. I'm told it is really 1.04. My springs are set up in the heads at 1.78 so you can see the large difference in the cam lift possible.

 

I'll dig thru my emails and see if I have that info...but I don't think I do anymore.

 

We both have TEA heads so they are likely set up the same. If so the .595 to .600 you remember could be right.

 

I can test a few 987s tomorrow and post the info that evening then.

 

I can't find that email...was back when I was on AOL.

TEA would know the right answer...might be best to ask Brian or Brent.

Who big a cam are you thinking about?

I know a G5x2 is usually too much for a 987 spring

 

Tea says 1.04. I'm wondering why Comp says 1.15?
Brent said a 5.95 lift would be fine with 987's. I would shift at 6700, so it seems okay.
Appreciate the help.

 

Jason, that would be a big help. Thanks Joe

 

The coil bind is actually 1.06 and we set the install height at 1.780. We have the G5X2 and ran the 987's for a while and then changed to the 978's. We check the springs with the retainer in place so this is all relavant with the parts used.

Revision:
I just tested 25 springs and got lowest coil bind of 1.05 and the highest was 1.09.

 

Thanks Brent. I have your Z06 heads with 987's. I guess a .595 cam set up properly will not be a problem. Are the 987's good for 6700 RPM's? Why did you change to 978's?
You can cross me off the return call list.
Joe

 

Good to learn the springs can run with a G5x2 sized cam for a while...might have to get a bigger cam for my project car.

 

987s don't work well with the G5X-2 cam. My dyno numbers are down 25rwhp after putting 3500 miles on the car after the heads/cam install. I was told by Lou G. and Jay from Absolute that the springs are most likely the problem.

 

Comp springs are not the most accurate pieces out there....as many have found out.
I've used them with mixed results on Fords. Most have no problems at all, but when you're pushing the envelope, the tend to not perform the way I'd like. I've since gone to the racing world for springs with great results. Unfortunately single LS1 springs are not as cheap & easy as Comp 918's. & for most setups the Comp springs seem to work just fine.
Would you belive LESS spring pressure from racing springs cured a valvefloat problem with stiffer Comp springs!?! LOL It's true! & both springs were tested on a Rimac for comparison.
-Shaun

 

Any experience with K Motion springs?

 

Sorry guys, didn't have time to test a 987 today. Looks like Brent has taken care of the info that was needed. If I find some time, I'll test a few anways.

Jason