Comp 26918 springs VS. Crane 144832 springs
07-27-2005, 12:45 AM
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Comp 26918 springs VS. Crane 144832 springs Comp Cams info
O.D.: 1.055/1.290
I.D.: 0.660/0.885
Seat Load: 130 @ 1.800
Open Load: 318 @ 1.200
Coil Bind: 1.085
Rate (lbs./in.): 313
Titanium Retainer: 772
Steel Retainer: 774,783
Cup/Seat: N/A
Shims: 4753
They say good for .600" max lift, but if you take the installed height of 1.800" and subtract the coil bind of 1.085" you get .715" then figure in a .060-.075" safety margin you get .655"-.640" max lift or am I not figuring in enough before coil bind on the beehives
Crane Info
Outer Diameter Outer Spring 1.275
Outer Diameter Inner Spring .937
Inner Diameter Inner Spring .667
Damper No
Seat Pressure @ Installed Height 112 lbs @ 1.800
Open Pressure and Height 352 @ 1.150
Coil Bind 1.045
Maximum Net Lift w/.060" Clearance .650
Average Spring Rate (lbs./in.) 352
These are good for .650" lift not sure if I will get a cam that large but it couldn't hurt. They claim these are quieter than the beehives
I am just looking for the best possible spring I can get for my LS1, the camshaft will be around .600" lift and I haven't decided on a crane, comp or cam motion yet
O.D.: 1.055/1.290
I.D.: 0.660/0.885
Seat Load: 130 @ 1.800
Open Load: 318 @ 1.200
Coil Bind: 1.085
Rate (lbs./in.): 313
Titanium Retainer: 772
Steel Retainer: 774,783
Cup/Seat: N/A
Shims: 4753
They say good for .600" max lift, but if you take the installed height of 1.800" and subtract the coil bind of 1.085" you get .715" then figure in a .060-.075" safety margin you get .655"-.640" max lift or am I not figuring in enough before coil bind on the beehives
Crane Info
Outer Diameter Outer Spring 1.275
Outer Diameter Inner Spring .937
Inner Diameter Inner Spring .667
Damper No
Seat Pressure @ Installed Height 112 lbs @ 1.800
Open Pressure and Height 352 @ 1.150
Coil Bind 1.045
Maximum Net Lift w/.060" Clearance .650
Average Spring Rate (lbs./in.) 352
These are good for .650" lift not sure if I will get a cam that large but it couldn't hurt. They claim these are quieter than the beehives
I am just looking for the best possible spring I can get for my LS1, the camshaft will be around .600" lift and I haven't decided on a crane, comp or cam motion yet
07-27-2005, 01:10 AM
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The cam being run should drive the spring choice. For me , I'm running a 224/224 .563/.563 112LSA cam. 918's are MORE than adequate with their .600 lift capability, and there is less unsprung valvetrain mass with the beehive (and titanium retainers).
My friend has a cheater cam with .608? lift on the intake. 918's didn't seem to be a good choice for that one (he had probs with upper RPM valve float), so he went PRC dual springs. The springs are heavier and will thus put more pressure on the valvetrain components, lifters, etc. That's the tradeoff.
Hope this helps.
Schantin
2002 Camaro Z28 M6
My friend has a cheater cam with .608? lift on the intake. 918's didn't seem to be a good choice for that one (he had probs with upper RPM valve float), so he went PRC dual springs. The springs are heavier and will thus put more pressure on the valvetrain components, lifters, etc. That's the tradeoff.
Hope this helps.
Schantin
2002 Camaro Z28 M6
07-27-2005, 01:16 PM
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Originally Posted by Schantin
The cam being run should drive the spring choice. For me , I'm running a 224/224 .563/.563 112LSA cam. 918's are MORE than adequate with their .600 lift capability, and there is less unsprung valvetrain mass with the beehive (and titanium retainers).
My friend has a cheater cam with .608? lift on the intake. 918's didn't seem to be a good choice for that one (he had probs with upper RPM valve float), so he went PRC dual springs. The springs are heavier and will thus put more pressure on the valvetrain components, lifters, etc. That's the tradeoff.
Hope this helps.
Schantin
2002 Camaro Z28 M6
My friend has a cheater cam with .608? lift on the intake. 918's didn't seem to be a good choice for that one (he had probs with upper RPM valve float), so he went PRC dual springs. The springs are heavier and will thus put more pressure on the valvetrain components, lifters, etc. That's the tradeoff.
Hope this helps.
Schantin
2002 Camaro Z28 M6
Something else to look at as well is the Cranes are dual springs if you want the piece of mind in case one breaks. Other than that, if your running a cam with 600+ lift, I would choose the Cranes over the 918's. I would also factor in more safty margin than .60-.75 for coil bind as well. as a side note, I run 832's with my Trex just fine at install height of 1.770.
Dan
