Valve spring question

[KonaGT]

Does anyone know if the O.D. of the intake springs is the same as the exhaust?

Does anyone know the factory installed height and spring rate on the stock springs?

 

[Coyotetivct]

The intake and the exhaust are the same OD. The stock springs are 50-70lbs at the seat. It is not a lot of pressure.

 

[beefcake]

i'm running the livernois, shimmed a bit

Specifications:

Install Height: 1.575
Max. Valve Spring Lift: .580
Spring Pressure Closed: 70lbs
Spring Pressure Open: 190
Coil Bind: .950

 

[KonaGT]

It would be a inexpensive upgrade to swap over to the Boss springs. I wonder if anyone is doing that with stock cams.

 

[Wnt2gofst]

It would be a inexpensive upgrade to swap over to the Boss springs. I wonder if anyone is doing that with stock cams.

Not stock cams but switching to Boss springs and valves with my Comp Cams Stage 3 cams.

 

[beefcake]

Not stock cams but switching to Boss springs and valves with my Comp Cams Stage 3 cams.

the boss springs are not much over stock. if your going to take the time to swap, i'd go with the livernois

 

[audidog]

the boss springs are not much over stock. if your going to take the time to swap, i'd go with the livernois

Very true I was shocked to see how little difference there was between the two when I was looking at my options.

 

[KonaGT]

Who makes Livernois springs for them?

 

[SteveP]

the boss springs are not much over stock. if your going to take the time to swap, i'd go with the livernois

+1

 

[slvr08gt]

This is probrobaly a stupid question but does upgrading the springs require a different tune? I would guess not.

-Nick

 

[beefcake]

Who makes Livernois springs for them?

Dunno, one would think pac, but can't say for sure

This is probrobaly a stupid question but does upgrading the springs require a different tune? I would guess not.

-Nick

NO

 

[KonaGT]

Dunno, one would think pac, but can't say for sure



NO

I was hoping PAC, but I know Associated Spring is right there near them in Michigan.

 

[KonaGT]

I want to leave the stock cams in my car is the thing, so I don't really need a bunch of extra spring pressure. I'm just thinking maybe the Boss springs might be better for a little more RPM and possibly a little better valvetrain stability. I won't need them for more aggressive lobe profiles.

 

[Sky Render]

I want to leave the stock cams in my car is the thing, so I don't really need a bunch of extra spring pressure. I'm just thinking maybe the Boss springs might be better for a little more RPM and possibly a little better valvetrain stability. I won't need them for more aggressive lobe profiles.

Why would you up the spring pressure with stock cams? How would that affect "valvetrain stability" or let you raise the rev limit? All it would do is slightly increase valvetrain power loss (due to the increase in needed force to open the valves) and perhaps cause unwanted spring harmonics. The stock valve springs were specifically engineered for the stock cams.

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[Kingcrabb]

Why would you up the spring pressure with stock cams? How would that affect "valvetrain stability" or let you raise the rev limit? All it would do is slightly increase valvetrain power loss (due to the increase in needed force to open the valves) and perhaps cause unwanted spring harmonics. The stock valve springs were specifically engineered for the stock cams.

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Valve Float?
A stronger spring will reduce floating valves allowing him to rev higher safer and still make power...
Thats all i could come up with. But still, if you're going to take the time and money to do it you may as well go with the best spring out there.

 

[KonaGT]

Stock vlave springs may not have been designed to go much more than the stock rev limiter either?

And perhaps they may have more harmoics, and perhaps they may have less. You should do a spintron test and let us know.