2 Broken Valve springs.
2 Broken Valve springs. We have a customers 2006 Trailblazer we installed this cam...
Engine:
Camshaft COMP cams Rob Style cam
Duration 220 , 228
Lift 0.58x, 0.58x
LSA 114
We installed these springs we got from Hitech Motorsports in Minnesota. PN is
PEP PSK658-8-7 and the specs are....
COMPLETE DROP IN LS 1 DUAL VALVE SPRING KIT .650 LIFT PACKAGE
INCLUDES
CHROME MOLY VALVE SPRINGS RETAINERS
LS1 VALVE SPRING SEATS
NEW STEEL VALVE LOCK
NEW VALVE SEALS
DUAL VALVE SPRINGS
SPRING SPECS: 1.295 OD/.690 ID
140#@ 1.800,385#@1.15, COIL BIND 1.050
Rev limit is set to 7k with shift points at 6.5k
Springs have been in less then a year. We did install an RPM transmission about 3 months ago and never retuned for the transmission but I cant imagine it going higher then the rev limiter anyways. We just dont know if we should replace all springs because these are garbage springs or if there is another thing that could be a problem or if we should just call it a fluke and replace 2 springs and move on.
Engine:
Camshaft COMP cams Rob Style cam
Duration 220 , 228
Lift 0.58x, 0.58x
LSA 114
We installed these springs we got from Hitech Motorsports in Minnesota. PN is
PEP PSK658-8-7 and the specs are....
COMPLETE DROP IN LS 1 DUAL VALVE SPRING KIT .650 LIFT PACKAGE
INCLUDES
CHROME MOLY VALVE SPRINGS RETAINERS
LS1 VALVE SPRING SEATS
NEW STEEL VALVE LOCK
NEW VALVE SEALS
DUAL VALVE SPRINGS
SPRING SPECS: 1.295 OD/.690 ID
140#@ 1.800,385#@1.15, COIL BIND 1.050
Rev limit is set to 7k with shift points at 6.5k
Springs have been in less then a year. We did install an RPM transmission about 3 months ago and never retuned for the transmission but I cant imagine it going higher then the rev limiter anyways. We just dont know if we should replace all springs because these are garbage springs or if there is another thing that could be a problem or if we should just call it a fluke and replace 2 springs and move on.
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It occurs to me that even if you over-revved..say to 7500, those springs shouldn't have broken without something else going wrong. Unless the torque converter completely let go that cam isn't going to shoot a lot past 7 anyway. Possibly customer doing something silly in neutral but it sounds like the springs just aren't up to the task.
I've heard about this vendor that makes a nice .660" dual setup for a real affordable price..I've seen him around here somewhere..why get anything else to save so few bucks?
Edit:
I am novice and learning with valvetrain but I at least know what the numbers mean I think.
So a .660" Platinum spring is rated:
155 lbs @ 1.780", 380 lbs @ 1.180", 400 lbs @ 1.130, coild bind @ 1.070"
1.780 - 1.070 = .710.
.710 - .660 = .05 clearance before coil bind at max rated lift.
The .650" springs above:
1.800 - 1.050 = .750"
.750 - .650 = .1" before coil bind.
I have seen a lot of evidence that running close to coil bind is desirable and the way you should set up your springs. Is it odd that the .650 springs are rated at twice the distance from coil bind or am I applying a paper/mathematical concept to something that just doesn't matter in reality?
I've heard about this vendor that makes a nice .660" dual setup for a real affordable price..I've seen him around here somewhere..why get anything else to save so few bucks?
Edit:
I am novice and learning with valvetrain but I at least know what the numbers mean I think.
So a .660" Platinum spring is rated:
155 lbs @ 1.780", 380 lbs @ 1.180", 400 lbs @ 1.130, coild bind @ 1.070"
1.780 - 1.070 = .710.
.710 - .660 = .05 clearance before coil bind at max rated lift.
The .650" springs above:
1.800 - 1.050 = .750"
.750 - .650 = .1" before coil bind.
I have seen a lot of evidence that running close to coil bind is desirable and the way you should set up your springs. Is it odd that the .650 springs are rated at twice the distance from coil bind or am I applying a paper/mathematical concept to something that just doesn't matter in reality?
Last edited by Mercier; May 8, 2016 at 09:34 AM.
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