987 coil bind?
987 coil bind? 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.
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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.
Originally Posted by 99 Black Bird T/A
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.
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.
Originally Posted by 99 Black Bird T/A
I'll dig thru my emails and see if I have that info...but I don't think I do anymore.
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 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
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Originally Posted by 99 Black Bird T/A
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 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
Brent said a 5.95 lift would be fine with 987's. I would shift at 6700, so it seems okay.
Appreciate the help.
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TECH Apprentice
Joined: Jun 2002
Posts: 321
Likes: 0
From: Bowling Green, KY
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.
Revision:
I just tested 25 springs and got lowest coil bind of 1.05 and the highest was 1.09.
Last edited by TEA Brent; Dec 26, 2003 at 10:14 AM.
Originally Posted by TEA Brent
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.
Revision:
I just tested 25 springs and got lowest coil bind of 1.05 and the highest was 1.09.
You can cross me off the return call list.
Joe
Launching!
Joined: Jan 2002
Posts: 201
Likes: 0
From: Sachse, TX
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.
On The Tree
Joined: Jan 2003
Posts: 167
Likes: 0
From: Fair Oaks, CA
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
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
I can shift faster than you.
iTrader: (21)
Joined: Nov 2001
Posts: 5,133
Likes: 0
From: Baton Rouge, LA
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
Jason