Why do I keep breaking valve springs???

[nick6690]

I've had a problem with breaking valve springs on my motor and I can't figure out what the problem is. I have AFR 185's #1492, a Comp xe282hr cam and comp pro magnum 1.6 rocker arms. When I had the heads converted to stud-mount, the machine shop put in comp springs, I'm not sure of the seat pressure but about a year after driving the car, I broke one of those. The machine shop gave me another one to put in. I broke another one of the comp springs about a month ago so I put a whole new set of Crane springs in and Friday night at the track I broke one of those and the valve dropped and hit the piston, bending the valve and scarring the piston a little bit. It's not just one valve or cylinder that's been the problem. I've had an exhaust one break, an intake break and all have been on a different cylinder. Has anyone else had this problem? Any help is appreciated.

 

[Shaolin Crane]

sounds like it could be your pushrods arent the right length

 

[capri debris]

Unless you're over-revving it alot, I'd say the pushrods are too long and smashing the springs. If that's the case, you better get it fixed or the rocker arms will be the next thing breaking.

 

[nick6690]

But that would only happen if i had extremely tight valve lash, but mine are fairly loose.

 

[JR4 Motorsports]

But that would only happen if i had extremely tight valve lash, but mine are fairly loose.

Define 'fairly' loose?

 

[nick6690]

Sorry that kinda was the wrong phrase to use haha.

I only tightened the rockers down about 3/4 turn past zero lash so they werent adjusted too tight.