Duramax Diesels Forum Truck of the Week
  #31  
Old 09-16-2012, 07:32 AM
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Pull the motor on a Friday night, do the swap on Saturday, put it back in Sunday...lol
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  #32  
Old 06-13-2014, 12:45 PM
Dallas S Dallas S is offline
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Bringing this back to life

How big are ppl opening oil squirters? And anyone ever shim the stock oil pump? If so how much? Is it possable to shim pump to compensate for bigger squirters or is there simply not enough volume from a stock pump?

Only ask cause I'm in the bottom end, and if I can simple drill the squirters and shim a pressure reg while I'm here, may as well do it.

*edit* on second though, guess there could be some cold start issues associated with higher psi... At any rate id like to hear other ppls opinions.
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Last edited by Dallas S; 06-13-2014 at 12:57 PM.
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  #33  
Old 12-23-2014, 06:32 AM
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both can't hurt. The advantage to shimming the relief and regulator is to help lubricate the mains and camshaft at higher rpm and load. Some can say it is unnecessary, but If we are doubling the torque and increasing RPM by 50%, then it is only logical to address the critical systems such as oil supply and cooling. I don't remember off the top of my head what I drilled the squirters out to, but for some reason .073" rings a bell.
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"Sore Subject" - Still don't have time for it.
I would never have learned what I have without George Alexander, Mike Lovrich, David Browning, Matt Handwork, Ben Tyler, Evan Drosehn and countless members of this forum and others.
Thank you.

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Last edited by juddski88; 12-23-2014 at 07:20 AM.
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  #34  
Old 12-23-2014, 09:24 AM
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Quote:
Originally Posted by juddski88 View Post
11% is what I've been told.
11% more oil flow.... I like that...

or running decent HP and heavy loads
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  #35  
Old 12-23-2014, 12:28 PM
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It is the best option other than Mellings high volume pump and Socal billet pump. Cost for everything for a plug and play conversion would be around 600 bucks for new items.
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  #36  
Old 12-23-2014, 01:33 PM
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How much more flow is smelling HV pumps?http://dirtyhookerdiesel.com/i-14902...-oil-pump.html
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  #37  
Old 12-23-2014, 02:20 PM
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Most if their pumps are 25 percent more flow. The least that I have seen that they offer is 10 percent.
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  #38  
Old 12-22-2015, 01:52 PM
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Bringing this back up. Curious what the final verdict was on if the conversion is worth it.
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  #39  
Old 12-22-2015, 02:08 PM
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I put melling 316 pump on. At 180 oil temp idle is 45 and 2000 is 75 taken at #2 main
Summit is the cheapest I've found for the said pump
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mispeeling wrods n a thraed nere u
99 chevy 3500 HD 06 LBZ/4L85E sold
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  #40  
Old 05-14-2017, 12:59 PM
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Bumping this up to the top, I took both a Melling M316 and stock LB7 oil pump apart and found the gears are identical width, diameter, and tooth count. So after finding this how can this pump actually flow more oil? The Melling has piss poor surface finishes, gears didn't look as nice as the factory ones either so the only thing I can assume is the housing holds a tighter clearance when hot vs the stock one (cast vs Aluminum) and maybe the relief valve spring is a little stronger. When I get time i'm going to try and test the opening point of both, anyone else running the Melling could they post there experiences I did see in this thread a few people are getting higher pressure readings just looking for more input on them.
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  #41  
Old 05-14-2017, 02:03 PM
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Mellings pump gears are taller and little bigger diameter than OEM

Aluminum has to be thick to yield same strength as steel.. making the pump out of cast iron means you can thin the walls out without sacrificing wall strength thus increasing ports for bigger gears and flow.

If orfice remains the same and flow is increase.. direct result pressure increases as well... pressure is directly corisponding to restriction.
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mispeeling wrods n a thraed nere u
99 chevy 3500 HD 06 LBZ/4L85E sold
07.5 3500hd RCLB LMM GT4088R, 4.56 gears 225/70/19.5 efi live with 418k as of 3/27/17
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  #42  
Old 05-14-2017, 04:53 PM
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Quote:
Originally Posted by malibu795 View Post
Mellings pump gears are taller and little bigger diameter than OEM

Aluminum has to be thick to yield same strength as steel.. making the pump out of cast iron means you can thin the walls out without sacrificing wall strength thus increasing ports for bigger gears and flow.

If orfice remains the same and flow is increase.. direct result pressure increases as well... pressure is directly corisponding to restriction.
He said he had it apart and everything was the same.

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  #43  
Old 05-14-2017, 04:58 PM
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Quote:
Originally Posted by LBZ View Post
He said he had it apart and everything was the same.

Sent from my D5803 using Tapatalk
I got one of each at the house...
If they where the same the gears would be interchangeable and I wouldn't see a 15 psi increase at idle
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mispeeling wrods n a thraed nere u
99 chevy 3500 HD 06 LBZ/4L85E sold
07.5 3500hd RCLB LMM GT4088R, 4.56 gears 225/70/19.5 efi live with 418k as of 3/27/17
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  #44  
Old 05-14-2017, 08:35 PM
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The gears from the LB7 pump fit in the Melling pump no problem so riddle me that, guess my caliper reading skills must be fukd
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  #45  
Old 05-14-2017, 08:41 PM
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That's pretty good info, I've been planning a build for when the time comes and I still scratch my head over an oil pump, I've always put a different pump in the gassers I had done, usually a high volume pump with the oil filter bypass blocked off, and never an issue, but seems like on the duramax a stock LB7/LLY pump with maybe a little stiffer return spring.
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