LS7 lifter imperfection?
10-01-2012, 11:57 AM
#1
Racer
Thread Starter
LS7 lifter imperfection?
I recently purchased some new lifters from one of our vendors. I wanted to post a photo of one of the lifters. There are a few more that are not as bad as this on but the other box I received doesn't seem to have significant imperfections. I guess my question is, Should I send these back? Figured I would post here before contacting the vendor. I am trying to hurry and get my car back together before we relocate to So. California.
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Last edited by apexman; 10-01-2012 at 12:57 PM.
10-01-2012, 02:55 PM
#2
Suckin' gas, haulin' ass.
Member Since: Apr 2010
Location: Newport News Virginia
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It looks like a ding during the manufacturing process. As long as the bore fit diameter and the roller remain unaffected, I wouldn't worry abou it. That isn't a machined or finished surface and wouldn't compromise fit, form, or function.
But I do think you should contact the vendor prior to posting. After a resolution has been settled between the two parties, then post. Leaving out names does make it a little better though.
But I do think you should contact the vendor prior to posting. After a resolution has been settled between the two parties, then post. Leaving out names does make it a little better though.
10-01-2012, 03:31 PM
#3
Racer
Thread Starter
Yes, no problems with the roller and it looks like the lifter will fit the bore without an issue. I wanted to get an opinion first before bugging the vendor.
Thanks for the reply Black89Z51
Thanks for the reply Black89Z51
10-04-2012, 08:38 PM
#7
Melting Slicks
It might not fail, looking at the pictures we have one of the lifter sides towards the bottom section of the lifter as far as the ding. Now I realize this imperfection might not effect the lifter roller mechanism in terms of contact to the cam, although, with the imperfection on the lifter and the effect of balance for this part on the engine, you have to take into account the momentum of the lifter with the balance for the components. This probably will not effect balance on the motor, and will probably be fine even if you plan to spin it for some reason to seven grand.
10-06-2012, 02:41 PM
#9
Melting Slicks
I'm not certain you can balance a set of lifters. However, even if one of them is unbalanced, it's unlikely the motor will see any significant hit in terms of loss of performance, even at these kinds of revs. You probably will not have your motor in the operating range for noticing the degradation, and the consistency of the parts will be unaffected.
Last edited by Hitman227; 10-08-2012 at 10:27 PM. Reason: misspelling
10-09-2012, 03:17 PM
#11
Safety Car
A failure is certain and can be determined and accurately predicted to within a small cycle margin by the Uniform Material Law (UML) when a material is subjected to repeated loading even without this type of flaw. This is the hardest working part in the engine and a failure here will cost you big time.
This indentation with it's sharp edges will drastically reduce service life by focusing stress points, where cracks will begin to form on and below the surface with certainty. The failure process starts with dislocation movements, forming slip bands that nucleate the cracks, a stochastic process as damage is cumulative. Sharp corners/edges, etc. will lead to elevated local stresses where fatigue cracks initiate.
The shape of the structure will significantly affect the fatigue life. Round holes and smooth transitions or fillets are therefore important to increase the fatigue strength of the structure.
This part can not be repaired. Does that help?
10-18-2012, 02:32 PM
#13
Suckin' gas, haulin' ass.
Member Since: Apr 2010
Location: Newport News Virginia
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Physics-materials science.
A failure is certain and can be determined and accurately predicted to within a small cycle margin by the Uniform Material Law (UML) when a material is subjected to repeated loading even without this type of flaw. This is the hardest working part in the engine and a failure here will cost you big time.
This indentation with it's sharp edges will drastically reduce service life by focusing stress points, where cracks will begin to form on and below the surface with certainty. The failure process starts with dislocation movements, forming slip bands that nucleate the cracks, a stochastic process as damage is cumulative. Sharp corners/edges, etc. will lead to elevated local stresses where fatigue cracks initiate.
The shape of the structure will significantly affect the fatigue life. Round holes and smooth transitions or fillets are therefore important to increase the fatigue strength of the structure.
This part can not be repaired. Does that help?
A failure is certain and can be determined and accurately predicted to within a small cycle margin by the Uniform Material Law (UML) when a material is subjected to repeated loading even without this type of flaw. This is the hardest working part in the engine and a failure here will cost you big time.
This indentation with it's sharp edges will drastically reduce service life by focusing stress points, where cracks will begin to form on and below the surface with certainty. The failure process starts with dislocation movements, forming slip bands that nucleate the cracks, a stochastic process as damage is cumulative. Sharp corners/edges, etc. will lead to elevated local stresses where fatigue cracks initiate.
The shape of the structure will significantly affect the fatigue life. Round holes and smooth transitions or fillets are therefore important to increase the fatigue strength of the structure.
This part can not be repaired. Does that help?
10-19-2012, 10:28 AM
#15
Safety Car
Who's the bum that sold it to you? Who made the parts? PM me.
Instead of exposing these bums, CF protects them because their revenue is more important to them than the well being of the forum members. It happens too many times to be a coincidence.
I know venders on this forum who should be in jail.
Instead of exposing these bums, CF protects them because their revenue is more important to them than the well being of the forum members. It happens too many times to be a coincidence.
I know venders on this forum who should be in jail.
