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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 12-27-2012, 11:37 AM   #1
Learjetguru
 
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Broken Valve Springs?

I have noticed there are a few threads about broken valve springs. I don't want to speculate as to why there seems to be a trend. But I have built more than my share of big and small block chevy's. Unless Chevrolet has a quality issue with the springs, the only other thing to my knowledge that would explain this trend is floating the valves at a high RPM range, or coil bind from a cam change. Any one else have any thought's?
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Old 12-27-2012, 09:27 PM   #2
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Quote:
Originally Posted by Learjetguru View Post
I have noticed there are a few threads about broken valve springs. I don't want to speculate as to why there seems to be a trend. But I have built more than my share of big and small block chevy's. Unless Chevrolet has a quality issue with the springs, the only other thing to my knowledge that would explain this trend is floating the valves at a high RPM range, or coil bind from a cam change. Any one else have any thought's?
I broke a spring on a stock valvetrain at 36k miles while driving down the hiway to work. Car has never been to the track.
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Old 12-27-2012, 09:34 PM   #3
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You may get better response if you put this in the v8/mechanical forum instead of the tuning forum.
As far as I know, MOST of the spring failures are aftermarket, not stock springs with stock cam.
I would say many of the breakages are due to improper spring choice per cam specs ( aggressive ramp rates, lift etc.) And also lack of checking the springs periodically. Some failures I'm sure are due to defective product or install.
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Old 12-27-2012, 09:50 PM   #4
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Just looking for answers. Thanks for the reply.
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Old 12-27-2012, 10:39 PM   #5
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i dropped a valve on the way home doin 40mph, low rpm...destroyed the engine with 41k on it. replaced under warranty... intake and HF cats, only mods.
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