broken valve spring

[rgp6373]

i just broke my second valve spring in 2 months . they are comp dual springs and i was told they are good for 700hp or more and i dont make that much so what could cause the failure ? it was the outter spring both times different cylinders . maybe a bad batch of springs not sure what could cause a spring to break

[detjoe]

it mighht be a bad batch of springs...look at ls1tech for more info

 

http://www.ls1tech.com/forums/showthread.php?t=692113

[misterp]

Other culprits:

• installed height too low or outright coil bind
  
• over-revving (spring material overheats)
  
• valve-float issue (very rare this breaks a spring but...)
  
• letting sit un-used in an engine for many years (they "take a set")
  
• severe engine over-heating
  
• material deficiency/failure
  

With what you're doing I'd agree it's a bad batch, either bad metalurgy or bad temper.

 

Mr. P.

Edited April 10, 2007 by misterp (see edit history)

[12'SROCK]

did you do a heat cycle for them when you first bought them?

[CNE]

I was told on mine to let the engine warm up good before driving. Stiff springs are more brittle than stockers and if revved cold, can break. I was also told not to rev it much the first drive, let them heat up and cool back down.

[rgp6373]

i always let it warm up . i got the spring fixed it was on the other head so i think i got a bad batch of springs . so i made an appoinment to get them all replaced . i think i will be splitting the cost with the shop cause they shouldnt break but then agsin there is no warrenty on stuff like that