Single beehive 9/18s
#43
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The spring is Comp's "new" conical spring (7228-16) with the OEM steel retainer and locks. I haven't weighed any of the springs by themselves.
#46
10 Second Club
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Weighed LS6 and PSI 1511.
REALLY INTERESTING!!
So this article shows the weight of the 918 Beehive at 99g. Some dual(likely comp also) at 121g.
http://www.enginelabs.com/engine-tec...-work-for-you/
I weighed stock and PSI 1511(pics below).
PSI 1511: 68g
Stock LS6: 78g
Comp 918: 99g(!!)
Comp? Dual: 121g
PSI saves 10g per spring over factory and a whopping 31g over 918! That's almost 50% more. 496g over 16 springs. I think half a kilo is significant.
No wonder that heavy-*** 918 doesn't show any benefit! I may be closer than I thought on my "Kia of beehives" comment.
What do you guys think?
REALLY INTERESTING!!
So this article shows the weight of the 918 Beehive at 99g. Some dual(likely comp also) at 121g.
http://www.enginelabs.com/engine-tec...-work-for-you/
I weighed stock and PSI 1511(pics below).
PSI 1511: 68g
Stock LS6: 78g
Comp 918: 99g(!!)
Comp? Dual: 121g
PSI saves 10g per spring over factory and a whopping 31g over 918! That's almost 50% more. 496g over 16 springs. I think half a kilo is significant.
No wonder that heavy-*** 918 doesn't show any benefit! I may be closer than I thought on my "Kia of beehives" comment.
What do you guys think?
I think it's pretty easy to see which springs one should and should not be running at this point.
#48
TECH Junkie
^^I am also interested!!
#56
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Psi 1511ml
My problem was CREATED by CompCams "behive" springs and cam at Westech, a bench Dyno test.
My ECU-882C, my coils, turbo LS, Comp Valve Train, Comp "turbo" cam. (free)
The Spring broke in minutes, cam made no power BEFORE the spring cracked.
I called Carl Wegner, he stated "I have never broke a "behive" PSI 1511ML spring in ANY of the GNW engines we sell, they are required items."
The camshaft was replaced by a stock GM ZO-6 item.
The PSI-1511ML's where installed
The engine now ran fine, we made 1200+ HP@22 PSI.
Another item I will NEVER understand, why most install a TI Retainer on an exhaust valve when the weight, with a steel retainer, is still less than the intake with a Ti Retainer.
Lance
My ECU-882C, my coils, turbo LS, Comp Valve Train, Comp "turbo" cam. (free)
The Spring broke in minutes, cam made no power BEFORE the spring cracked.
I called Carl Wegner, he stated "I have never broke a "behive" PSI 1511ML spring in ANY of the GNW engines we sell, they are required items."
The camshaft was replaced by a stock GM ZO-6 item.
The PSI-1511ML's where installed
The engine now ran fine, we made 1200+ HP@22 PSI.
Another item I will NEVER understand, why most install a TI Retainer on an exhaust valve when the weight, with a steel retainer, is still less than the intake with a Ti Retainer.
Lance
#57
TECH Addict
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I have always wondered the same thing. Technically you don't need quite as much spring, either; especially not with the smaller exhaust valve and Ti retainer. But like everything else it seems the market is based on sets of 16, 8, etc.. You can buy singles but it doesn't save much. I bet mfgs/vendors also don't want to depend on the end user to put the right stuff on the right valves. Put the lighter spring and/or heavier retainer on the (bigger/heavier)intake valve and things can get 'splodey.
#58
TECH Addict
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Finally got off my butt to weigh some BTR parts. This is the BTR "Platinum" .660" lift kit (SK001) with titanium retainers. The locks are not titanium in this kit but steel(or some ferrous material but close enough)
BTR dual spring: 94g
Retainer: 9g
Locks: 3g
So the BTR duals weigh less than a 918 single?! No wonder we've been eating up the marketing of duals having no disadvantage(weight/power/RPM) compared to singles.
Again, the BTR .660s are fantastic.
But with the right setup, there is likely a place for a light-weight beehive.
BTR dual spring: 94g
Retainer: 9g
Locks: 3g
So the BTR duals weigh less than a 918 single?! No wonder we've been eating up the marketing of duals having no disadvantage(weight/power/RPM) compared to singles.
Again, the BTR .660s are fantastic.
But with the right setup, there is likely a place for a light-weight beehive.
#59
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Solid info. Thanks mercier! Not our fault comp springs need Jenny Craig.
#60
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Spring Nose Pressure/Lifter Plunger Diameter
YES, I do use different springs on Intake/Exhaust Valves.
I have used "duals" on intake ONLY for a SC engine requirement.
This method can allow for seat pressure (high) AND low nose pressure (Hyd Lifter).
I have used "solid" Intake Lifters/Hyd Exhaust on SC cams.
I would like to ADD, the cam lift/nose pressure amount can EXCEED the ability of the stock GM lifter to maintain "0" lash as RPM increased.
Just another reason to fit a PSI 1511ML spring.
Lance
I have used "duals" on intake ONLY for a SC engine requirement.
This method can allow for seat pressure (high) AND low nose pressure (Hyd Lifter).
I have used "solid" Intake Lifters/Hyd Exhaust on SC cams.
I would like to ADD, the cam lift/nose pressure amount can EXCEED the ability of the stock GM lifter to maintain "0" lash as RPM increased.
Just another reason to fit a PSI 1511ML spring.
Lance