Valve Springs
#11
I recently learned that 60lb springs are basically a waste of time. They have the same spring rate at 1.40 lift I think as stock springs.
Just having better control over your valves, is well worth the effort of installing these springs whether you rev over 3200 or not. Remeber, valve float is when it's moving so fast that it bounces off the seat when it closes. You're getting a lesser amounts of that well before it bounces enough to hit the piston. Having better control of the valves is just better!
#12
#15
Perhaps true, but valve control is the real reason for the springs. Replacing valve springs is a proven high-performance that has been on-going in gas and diesel engines since the first person decided to up the rpm level of an engine to gain performance. This is rather proven technology.
#16
#17
Very true, but it will allow higher RPM before it happens. Any valve on any engine can float, and springs do wear out. They can not keep the same seat pressure forever. If you want to spin anymore than 3200 on a 5.9 you need a way to keep the valves from jumping back off the seat. Or maybe its only my ol' 308000 mile engine that floats at 3200.
#18
What I am saying is that 60lb springs raise SEAT pressure. When the spring is compressed as the valve opens the spring tension is near stock. Seat pressure doesn't keep valves under control with big Rs and high boost. I have 60lb springs in my truck right now but they will be coming out and Hamilton springs retainers and keepers are going in.
#19
#20
Just had a look at the Haisley site, they seem to be on top of their game also. I haven't contacted Hamilton Cams yet to see what their valve spring kit includes, but it seems as though Haisley has the intake and exhaust springs in theirs and it's only like $140. I'd like to find out from Haisley what the springs are like if they're only like the 60# springs or better.