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Old 12-06-2013, 06:45 PM   #15
376LS3
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Originally Posted by Synner View Post
They didn't center the pump on the snout properly.
I am 100% in agreeance with this. This is why I dont believe in "upgrading" to a Mellling because I dont see it as any better than stock. I believe the oil pumps that fail, were installed incorrectly, or trying to run oil that they were not designed to move. Sure, just like any mechanical part, they break. But a Melling can break too. I just dont see it as insurance if everything was put back together per spec.

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The thing Is, he told me that the oil pump fails and caused the damage because of using a thin oil "mobil1 10w30" and he's telling mo that I've to use a thick oil "like mobil 20w50 or anything 20w50", someone's correct me If i'm wrong, but Isn't the clearences tight In my situation? "newly rebuilt engine" which needs a thinner oil not a thicker one!
I have always been one to say the thicker oil can cause the pumps to fail. If GM made them to run 30w oil, then pushing 50w through them is like moving molasses.
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Old 12-06-2013, 07:16 PM   #16
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What Oil to use after engine rebuild?

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Originally Posted by Synner View Post

Swapping a camshaft does not change a bearing tolerance ANYWHERE.
What about the cam bearings?

Don't listen to whoever built this motor. He is blaming his mess up on the oil. He screwed up. Next time it blows go somewhere else for the rebuild.
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Old 12-06-2013, 07:45 PM   #17
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What about the cam bearings?

Don't listen to whoever built this motor. He is blaming his mess up on the oil. He screwed up. Next time it blows go somewhere else for the rebuild.
Cam journals are the same size...
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Old 12-06-2013, 08:05 PM   #18
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Guys you can run a thicker oil without damage to the pump. That's not an issue.
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Old 12-06-2013, 09:02 PM   #19
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Guys you can run a thicker oil without damage to the pump. That's not an issue.
Hmm....Ive just always mentally been against that because the oil the factory puts in, is what the mechanical parts are setup to run. To run a 50w oil, youre almost doubling the viscosity of what that part is designed to run. Obviously with a built engine, stock specs go out the window, and the builder should determine the oil, and the oil pump needed. A Melling is crucial for built engines or stock engines that are road raced and sustain high rpms for minutes at a time. I would by all means listen to Zeke over me OP. That is just the way Im thinking of the subject, not necessarily a fact.
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Old 12-07-2013, 12:00 AM   #20
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Guys you can run a thicker oil without damage to the pump. That's not an issue.
Not in a newly rebuilt engine with a tight clearances!

This is what i found:

The thick oil like 20W50 can not flow through suck a tight space and engine does not get the oil it needs In time. Using 20W50 In an engine with modern tolerances will Inadequately lubricate the Babbit bearings on the crank and camshaft and the rings and valve stems .. pretty much everything, In fact.

The engine builder is telling me to use 20W50 I think I'll bring him 10W40 instead!
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Old 12-07-2013, 06:51 AM   #21
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Quote:
Originally Posted by InfernoLS3 View Post
Not in a newly rebuilt engine with a tight clearances!

This is what i found:

The thick oil like 20W50 can not flow through suck a tight space and engine does not get the oil it needs In time. Using 20W50 In an engine with modern tolerances will Inadequately lubricate the Babbit bearings on the crank and camshaft and the rings and valve stems .. pretty much everything, In fact.

The engine builder is telling me to use 20W50 I think I'll bring him 10W40 instead!
After everything I just read, I think I would just go to a different builder..
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Old 12-07-2013, 10:46 AM   #22
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I asked Andy at ADM about using a melling on my 417 and he said he always uses the stock GM pump on all his builds. He said it basically comes down to who installed the pump and cam or whatever build was going on at the time so he put a factory GM pump back on mine and I will be running 15w50 mobil1 in my new build.
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Old 12-07-2013, 12:54 PM   #23
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Quote:
Originally Posted by 10aSSee D View Post
I asked Andy at ADM about using a melling on my 417 and he said he always uses the stock GM pump on all his builds. He said it basically comes down to who installed the pump and cam or whatever build was going on at the time so he put a factory GM pump back on mine and I will be running 15w50 mobil1 in my new build.
Mobil 1.15w50 has a much better additive package than any of their other oils. M1 5/10w30 is designed with low emissions as a high priority. It's crap. I drive a cammed car everyday as my get back and forth to work car. I use VR1 synthetic 10w30.
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Old 12-07-2013, 03:05 PM   #24
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Mobil 1.15w50 has a much better additive package than any of their other oils. M1 5/10w30 is designed with low emissions as a high priority. It's crap. I drive a cammed car everyday as my get back and forth to work car. I use VR1 synthetic 10w30.
You are right on that.
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