Noahs944

What's the difference between 8 v turbo & na valve springs?
Do they "wear out" with mileage?

V2Rocket

turbo springs are "stiffer" to deal with the added boost pressure acting against them.
in an NA car that lends a little more high rpm capacity/stability for an aggressive cam.
they can wear out and lose some springyness but luckily they are cheap brand new still.

Van

ALL springs wear out over time due to number of cycles.

Noahs944

Okay...

Thanks guys.

I *think* MM mentioned that he's never seen a stock set of 16v springs wear out. So I thought I'd enquire about the 8v. For my uses I'll save the bucks & fork out for turbo ones. Are 951 engines fine with with 15lbs of boost and mild cam?

Noahs944

My mind can understand the aggressive camshaft requiring a stiffer spring rate... but I fail to understand the dynamics of boost requiring stiffer 'uns.

V2Rocket

15lbs + cam yes just keep the rpm down (stock redline or lower)
the spring wants to keep the valve closed.
boost pressure in the intake manifold wants to push the valve open (or keep it open if the camshaft has opened the valve already).

so cam pressure + boost pressure pushing down on the valve needs more spring power to pull it back closed.

Noahs944

Makes sense brother... thanks.