Need some springs, mass vs weight vs seat pressure
04-23-2007, 07:55 PM
#1
Need some springs, mass vs weight vs seat pressure I need to find a set of valve springs for my next setup but need alittle help from someone who knows alot about springs. I need a spring for:
Hyd setup
Lifters will be ran close to bottomed out
Max RPM is going to be about 7500-7800
Lift: .605-.620
Pushrods: 3/8" .135 wall for max stiffness
Lifters: Jesel LS7 lightweight option
Max installed height: 1.850
I think I am looking for a spring with about 175# on the seat and 450# open. I've looked at a few springs and can't seem to choose the best one. One has alittle less seat pressure but is a behive while the other is a dual with more mass but has more seat pressure.
Phil
Hyd setup
Lifters will be ran close to bottomed out
Max RPM is going to be about 7500-7800
Lift: .605-.620
Pushrods: 3/8" .135 wall for max stiffness
Lifters: Jesel LS7 lightweight option
Max installed height: 1.850
I think I am looking for a spring with about 175# on the seat and 450# open. I've looked at a few springs and can't seem to choose the best one. One has alittle less seat pressure but is a behive while the other is a dual with more mass but has more seat pressure.
Phil
04-23-2007, 10:49 PM
#2
If the only difference is a little less seat pressure, go with the beehive. A lot of people don't like them because a dual spring gives a little insurance if a spring breaks, but the beehives have so many advantages in the areas of harmonics and total mass that I would use them on anything that they have enough travel and open pressure for.
04-25-2007, 08:51 PM
#5
Don't you run into a problem with the lifters collapsing after you reach a certain spring pressure? I am going to do an 8000 rpm ls2 soon and I am going to go with solids so I can use whatever spring pressure I want. I have a 406 solid roller with fairly heavy springs and it is really nice. I can pretty much rev it as high as I want with zero float problems...It seems to me the extra money spent on lifters and rockers is offset by not having to spend a fortune on special springs, lifters, etc. Good luck and let us know what you wind up doing.
04-27-2007, 11:51 AM
#6
Phil...
What do the valves weigh?
If we are talking about the stock Ti LS7 valves you are set. They are featherweights and are ridiculously light even for titanium. They are around 80 grams and possibly in the high 70's if I recall.
The weight of the valve is a key piece of this puzzle, not the diameter of the head.
Tony
I also like the beehive design but worry about the breakage. IMO if a lightweight dual spring would work it would be my first choice but I also concede that a beehive with similar seat and over the nose pressures may work better, mainly due to less overall mass.
What do the valves weigh?
If we are talking about the stock Ti LS7 valves you are set. They are featherweights and are ridiculously light even for titanium. They are around 80 grams and possibly in the high 70's if I recall.
The weight of the valve is a key piece of this puzzle, not the diameter of the head.
Tony
I also like the beehive design but worry about the breakage. IMO if a lightweight dual spring would work it would be my first choice but I also concede that a beehive with similar seat and over the nose pressures may work better, mainly due to less overall mass.
04-27-2007, 09:58 PM
#7
I'm trying to get the valve weight as we speak. I just got $800 that I wasn't expecting so I might as well go solid roller. Looking at my tire size and rear end I'll probably see 8000-8500. I'll post up the valve weights as soon as I get them.
Phil
Phil
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04-28-2007, 09:03 PM
#8
Originally Posted by gametech
If the only difference is a little less seat pressure, go with the beehive. A lot of people don't like them because a dual spring gives a little insurance if a spring breaks, but the beehives have so many advantages in the areas of harmonics and total mass that I would use them on anything that they have enough travel and open pressure for.
