Lightest dual spring
03-29-2011, 12:51 PM
#4
sounds like lightest by weight . lighter valvetrain parts make faster movement .
though using a heavy duty valve spring would make a smaller valve lift cam tougher to cycle through thus slowing the cycle . so if it was a ls6 valve spring with a hotcam or something around its max .550+ or a 918 spring at .600 + would get the most out of it .
lets say using a ls6 cam with a top notch .660 valve spring would be harder to cycle . not that it would take too much away but would not make as much power .
though using a heavy duty valve spring would make a smaller valve lift cam tougher to cycle through thus slowing the cycle . so if it was a ls6 valve spring with a hotcam or something around its max .550+ or a 918 spring at .600 + would get the most out of it .
lets say using a ls6 cam with a top notch .660 valve spring would be harder to cycle . not that it would take too much away but would not make as much power .
03-30-2011, 02:30 PM
#6
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I went with PRC's with titanium retainers (light). I havent seen where anyone actually weighted the spring though.
If you dont have a big cam you could always go with a beehive like Snake Charmer is talking about. They will weigh quite a bit less than a dual but wont resist valve float as much.
Tons of guys are revving really high with duals and titanium retainers, I think its more important to get the correct spring pressure than it is to worry about the weight. Unless your talking about revving to 9000rpm or something, then both might be equally important.
Background?? Why are you trying to get the lightest spring? Have a high rpm build in mind?
If you dont have a big cam you could always go with a beehive like Snake Charmer is talking about. They will weigh quite a bit less than a dual but wont resist valve float as much.
Tons of guys are revving really high with duals and titanium retainers, I think its more important to get the correct spring pressure than it is to worry about the weight. Unless your talking about revving to 9000rpm or something, then both might be equally important.
Background?? Why are you trying to get the lightest spring? Have a high rpm build in mind?
03-30-2011, 07:34 PM
#7
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I have sodium hollow valves ls6 heads. I am running eps 610 239 on a 112. I am going to run ti but would hate for springs to use up the valve benefits. I am going to turn around 7k but do alot of traveling around country What would a good seat preassure be for me
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03-31-2011, 04:33 AM
#10
The 1518 issue may not be a concern since PAC is aware of it. TSP seems to be on top of it and would be a good vendor to get them from since they are aware of the problem and are in direct contact with PAC. I would feel comfortable they can get you a set that is not affected by this recent issue.
The PSI 1511 is an excellent spring but your lift may be too much for them. As I recall they set up at 125# on the seat when installed at 1.800", however I have never had them setup that tall and they have come in around 1.765". At a lower installed height, the seat value is higher but the amount to lift is also reduced. You would need to measure then order to be sure things will go together correctly. With the lighter LS6 valves, the 125# seat value may be adequate if you can achieve it. I have weights of the PSI's somewhere at home along with the retainers that came with them on a set of Dart heads. Also, careful with too much spring on these valves, there have been some reported issues with the valves when spring forces are pumped up too high.
The PSI 1511 is an excellent spring but your lift may be too much for them. As I recall they set up at 125# on the seat when installed at 1.800", however I have never had them setup that tall and they have come in around 1.765". At a lower installed height, the seat value is higher but the amount to lift is also reduced. You would need to measure then order to be sure things will go together correctly. With the lighter LS6 valves, the 125# seat value may be adequate if you can achieve it. I have weights of the PSI's somewhere at home along with the retainers that came with them on a set of Dart heads. Also, careful with too much spring on these valves, there have been some reported issues with the valves when spring forces are pumped up too high.
