High hp guys how often you change valve springs

[jery1234]

Is there a general rule for this ? Every company that sales valve springs is advertising the spring pressure & RPM, but non of them are saying anything when is the time to replace them.

 

[Lou98GSX]

I think it depends on your cams and how far you want to rev your motor to .

 

[Archer Fabrications]

There has to be a fatigue life of some sort. How much use did your springs have? I know @donniekak was telling me titanium retainers have a fitigue cycle limit. Do you think your retainers failed or the spring itself?

 

[jery1234]

Nothing wrong with the retainers the spring its self brock . True I vas revving to 9k but not like every day .Mild cams hks 272 .

 

[donniekak]

I've been revving to 8500-9000+ for a few years. I changes my valvesprings every year when I do my teardown. I do drive my car 10,000+ miles every year, and bang off the limiter every day. I also use steel retainers. It's rare for titanium retainers to fail, but they do eventually if stressed enough for enough cycles.

 

[bastarddsm]

There has to be a fatigue life of some sort. How much use did your springs have? I know @donniekak was telling me titanium retainers have a fitigue cycle limit. Do you think your retainers failed or the spring itself?

Yes, there is a very well defined fatigue life, it's called the s/n curve. The lift would be s, and rpm*time would be n. The problem is it's almost impossible to predict real valvetrain motion.

 

[too_genecide]

Valve springs need to be replaced when they start losing pressure at a given height.
Spring pressure is usually checked at installed height and Valve open height.
Its best not to wait until they break to replace them.

 

[Archer Fabrications]

Dunno if it was mentioned but jery is also a 2.3 for what it's worth

 

[biglady112]

That has nothing to do with valvespring lifespan.

 

[donniekak]

That has nothing to do with valvespring lifespan.

Most people with 2.3's aren't going over 7500-8000 rpms.

 

[biglady112]

The guys here in Denver are not most people. 8500rpm on stock springs is no big deal around here. I was just stating the obvious that displacement alone has nothing to do with valvetrain wear.

 

[jery1234]

I know displacement has nothing to do with broken spring I just don't get wtf is causing the spring to broke (not even 2 years old ) . I have finished brand new engine 2.3 vader rods wiseco hd pistons 60 miles on it and I have to replace one piston (got lackey with cylinder wall) not to mention cylinder head is a goner too . So I fill like all the company's that sale the springs should give us some idea when to replace the springs according to lift (from -to ) (rpm from -to).