Test Data: Comp Cams 987 Dual Valve Springs after 60,000 miles & 9 years - LS1TECH



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Test Data: Comp Cams 987 Dual Valve Springs after 60,000 miles & 9 years

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Old 03-13-2017, 09:35 PM   #1
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Default Test Data: Comp Cams 987 Dual Valve Springs after 60,000 miles & 9 years

Background

My 99TA had about 30,000 miles when the heads and cam package was installed in 2002. Today the 99TA has 157,000+ miles with the same heads & cam package. The valve springs were last replaced in 2008 when the car had about 95,000 miles. The TA sees daily driver use and some fun from a roll on occasion but hasn't been to the drag strip in over ten years. Rev limiter is set at 6,800 rpm and I've hit it several times but normal shift point is 6,200 to 6,300 rpm. Very seldom does the car see 6,500+ rpm.

I know there are many good valve spring solution these days that are better than the 987 dual spring. I think TEA did fantastic building a 5.3 Stage 2 cylinder head that proved high quality and affordable. After 125,000 miles, I think it's proved the XER cam lobes are suitable for daily driver's with reasonable care and upkeep.

My TA was always allowed to fully warm up before seeing more than 3,000 rpm seldom saw more than 2,000 when warming up. Warm up was normal water temp on gage and oil pressure at normal for full warm up - typically 42 pounds for this car.

Thank you to Norris Motorsports for doing the new BTR Platinum valve spring kit install and saving my old valve springs and hardware. Likewise, I want to thank Land Speed cylinder heads for helping me get the old valve springs tested.

The 987 Springs held up as show below. The springs were disassembled, cleaned in a parts washer, rinsed, dried with compressed air and reassembled. They were tested using a seat and the height was taken into account. All 16 Springs were tested but not in any particular order.

Comp Cams states on their website new springs may have pressures vary by about 10 percent.

99 Black Bird's valve spring test results.


I will post some retainer and hardware pictures later.

Last edited by 99 Black Bird T/A; 03-13-2017 at 09:41 PM.
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Old 03-13-2017, 10:01 PM   #2
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I'd say you got your moneys worth on those springs.
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Old 03-13-2017, 10:03 PM   #3
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Aww man! You coulda got another 150K outta them! lol
Congratulations man! They held up VERY well!
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Old 03-14-2017, 10:30 AM   #4
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what cam are you running?
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Old 03-14-2017, 02:03 PM   #5
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Did the springs still look square?

At 4 years old my TSP PRC650's all have about 1/16 - 1/8" of tilt (228r cam).
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Old 03-14-2017, 03:24 PM   #6
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Comp Cams 224/224 XE-R .581/.581 lift - customer ordered on a 113 LSA with 4 degrees advance. Per cam doctor check before install was within 1 degree on all specs, almost a 225/225 on 112.x LSA. This was back in 2002 and Comp was nearly perfect with what my friend and installer spec'd.

Lol, yes the springs are still square and look good.
They are still suitable to use based on pressures but there no way I will reuse them.

The retainers are scary looking with 125,000 + miles XE-R cam lobe love...going forward I will always replace them when getting new springs.

Will get some pictures
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Old 03-14-2017, 04:42 PM   #7
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The seats and shims all look pretty good. All the springs look like this:



The retainers look bad.
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Old 03-14-2017, 04:57 PM   #8
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Default XE-R cam beats retainers for 125000+ miles

Here are the worst of the worst. None were in decent condition.

Left side 9 oclock
Notched
Left side at 7 oclock chunk missing




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Old 03-14-2017, 05:46 PM   #9
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Wow. That is pretty incredible, thanks for sharing.

I am willing to bet those are not tool steel retainers, or at least not high quality ones. Which is another big reason I avoided Ti retainers: http://www.speedtalk.com/forum/viewtopic.php?t=5081
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Old 03-15-2017, 10:30 AM   #10
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WOW. Great read. Thanks for sharing. Super cool to see stuff like this and someone who has and will take the time to share instead of throwing new stuff in and being done. Those retainers
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Old 03-17-2017, 03:33 PM   #11
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Awesome, thanks for sharing - I really like how you look at things in detail. If anyone is interested, I could add pictures of a spring and retainers that was tortured and eventually broken by an MS4 cam
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Old 03-18-2017, 12:08 AM   #12
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Quote:
Originally Posted by FlorianGee View Post
Awesome, thanks for sharing - I really like how you look at things in detail. If anyone is interested, I could add pictures of a spring and retainers that was tortured and eventually broken by an MS4 cam

Thank yoy. Yes, i wouldwould like to see the spring & retainer.
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Old 03-18-2017, 06:45 AM   #13
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Great information, thanks for taking the time to measure and post. Did you measure with the titanium retainers? Wonder how much the grooves in the retainers are reducing your spring values. Also good to hear the XER setup went that long. That is one thing I have always wondered about.


I have a 224/228 XER with 0.581 lift and I do similar with the warm up. Don't go above 1,500 RPM until oil is at 160 and then not over 2,000 until oil is over 180. With the six speed I can still move with traffic at those low RPM it just means you are not getting there as quickly. Also currently running the Amsoil Z-Rod oil.
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Old 03-19-2017, 09:10 PM   #14
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Vettenuts, pressure check was without a retainer as we wanted to see how the springs held up. That's an excellent point!

I wish I had thought to check with a the best and worst retainer on the same spring to see what effect it would have. I still have the parts do maybe later I can check.

My car may have had less actual spring pressure. The valves never floated that I could tell for what that's worth. We did have the old 987's shimmed to help make sure they kept effective pressure.

The retainers on the 99TA both old and new are tool steel.
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Old 03-20-2017, 06:30 AM   #15
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Wondering how long my AFR 8019 springs will go. They rarely see much high RPM and I go through a pretty rigorous warm up cycle whe use the car.
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Old 03-20-2017, 07:42 PM   #16
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I've got some Prc .650 duals with 10 years and 60k miles.

I don't regularly warm them up. Car dynos the exact same numbers as it did ten years ago.
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