Weak Valve Spring Symptoms?
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by GRX
What are the symptoms of tired valve springs? ...mid-rpm miss?
Instructor
Joined: Jun 2004
Posts: 249
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From: clinton ut
Tired valve springs would not probably show up until you reach higher rpm and then they float. Engine seems like it hit a rev limiter and you won't necessarily get a miss. This is if all or most springs are weak. If only one or two weak the other answers are also correct.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by GRX
What are the symptoms of tired valve springs? ...mid-rpm miss?
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- on my Dad's 86 it acted like a mild miss. Not as bad as a plug out or a failed injector.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
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From: seattle WA
Depends on which valve the spring is weak, intake or exhaust where the back fire will occur. I'd say if you ran your car in 1st or second reaching a higher RPM you may be able to tell.Then again-it could be a lifter. 
Race Director
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Generally, valve springs don't get "weak", they break. It's one of those components (like gears or axles) that work just fine right up until the point where they fail completely.
Once a valve spring breaks, the engine just drops that cylinder...permanently.
My own answer to the topic question: there are no symptoms of weak valve springs. Modern metallurgy (in the past 30 years that is) doesn't allow valve springs to get 'weak'.
That's my opinion.
Larry
Once a valve spring breaks, the engine just drops that cylinder...permanently.
My own answer to the topic question: there are no symptoms of weak valve springs. Modern metallurgy (in the past 30 years that is) doesn't allow valve springs to get 'weak'.
That's my opinion.
Larry
Last edited by rocco16; Oct 12, 2004 at 11:18 AM.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by code5coupe
Generally, valve springs don't get "weak", they break. It's one of those components (like gears or axles) that work just fine right up until the point where they fail completely.
Once a valve spring breaks, the engine just drops that cylinder...permanently.
My own answer to the topic question: there are no symptoms of weak valve springs. Modern metallurgy (in the past 30 years that is) doesn't allow valve springs to get 'weak'.
That's my opinion.
Larry
Once a valve spring breaks, the engine just drops that cylinder...permanently.
My own answer to the topic question: there are no symptoms of weak valve springs. Modern metallurgy (in the past 30 years that is) doesn't allow valve springs to get 'weak'.
That's my opinion.
Larry
RACE ON!!!
Drifting
Joined: Feb 2003
Posts: 1,976
Likes: 2
From: San Antonio Texas
Valve-springs do get "weak", especially with high rpm race-cars. They do it pretty quickly too;and are replaced at a regular interval. They just won't reach the RPMs anymore; same on a street car. It'll start missing at lower, and lower RPMs. If you run a weak one long enough, then it'll break.
Race Director
Joined: Dec 2002
Posts: 13,348
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
[QUOTE=RUBYREDVETTECARD]Are you SURE about that???? 
[/QUOT
Yeah. Every bit as sure as CFI is....
Nobody has to believe me, but I challenge them to prove me wrong.
Larry
[/QUOTYeah. Every bit as sure as CFI is....
Nobody has to believe me, but I challenge them to prove me wrong.
Larry
Last edited by rocco16; Oct 12, 2004 at 01:09 PM.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by code5coupe
Originally Posted by RUBYREDVETTECARD
Are you SURE about that????
Nobody has to believe me, but I challenge them to prove me wrong.
Larry
RACE ON!!!
