thin or thick oil pump O-ring?
Thread Starter
Burning Brakes
Joined: Sep 2003
Posts: 866
Likes: 22
From: Savannah GA
thin or thick oil pump O-ring?
Putting together an LS1 for the Vette.I was thinking of using either a melling pump with the standard spring, or a ported LS6 pump with the high pressure spring. But what I dont know is if I should be using the 'thin' or 'thick' o-ring. This LS1 was pulled back in '98 from an SS at the dealership. The engine was ticking and the o-ring split while sitting in the bay; they didnt know the problem at the time so they replaced the entire engine. Clean as could be otherwise for 320 miles 
Dont know what to use. this LS1 will have Livernois heads, LS6 intake, new stock injectors, ported TB, the same 226/230/114 cam I run now, LS7 lifters, 918 springs, LS2 chain and new rocker arms. If my oil pressure maxed at 50 I would be happy but I have yet to see it peak 40. Idles at 20 or less.
Dont know what to use. this LS1 will have Livernois heads, LS6 intake, new stock injectors, ported TB, the same 226/230/114 cam I run now, LS7 lifters, 918 springs, LS2 chain and new rocker arms. If my oil pressure maxed at 50 I would be happy but I have yet to see it peak 40. Idles at 20 or less.
Melting Slicks
Joined: Mar 2005
Posts: 2,364
Likes: 1
From: Rugby North Dakota
I THINK you will need the thicher O-ring
IF you put in a Melling Oil pump, use the BLUE spring - the Melling pump comes w/ a RED spring installed and w/ a BLUE spring if you want lower oil pressure - TRUST ME, you want to put the BLUE spring in the melling pump BEFORE you install it - how do I know, well, I didn't do that, and I get 65 PSI at 2500 w/ engine warm, and the PSI goes UP, WAY UP from there - so guess what I get to do
IF you put in a Melling Oil pump, use the BLUE spring - the Melling pump comes w/ a RED spring installed and w/ a BLUE spring if you want lower oil pressure - TRUST ME, you want to put the BLUE spring in the melling pump BEFORE you install it - how do I know, well, I didn't do that, and I get 65 PSI at 2500 w/ engine warm, and the PSI goes UP, WAY UP from there - so guess what I get to do
Instructor
Joined: Sep 2005
Posts: 199
Likes: 0
From: Chesapeake VA
+1 on the thicker O-Ring. As you can see from these pics the oversized ring fills the gap much better.
Original O-Ring
Oversized O-Ring (p/n 12557752)
Original O-Ring
Oversized O-Ring (p/n 12557752)
Last edited by HP Addict; Apr 19, 2007 at 07:46 AM. Reason: corrected o-ring p/n
Thread Starter
Burning Brakes
Joined: Sep 2003
Posts: 866
Likes: 22
From: Savannah GA
Sounds good...
Dont know if I want to use the melling pump or not yet. Seems like it has more flow capacity than the stocker which would be why it makes so much more pressure. Not sure if I am going to use a ported LS6 pump with a high pressure spring or the melling with the low pressure spring. Decisions, decisions...
Dont know if I want to use the melling pump or not yet. Seems like it has more flow capacity than the stocker which would be why it makes so much more pressure. Not sure if I am going to use a ported LS6 pump with a high pressure spring or the melling with the low pressure spring. Decisions, decisions...
Melting Slicks
Joined: Jun 2006
Posts: 2,983
Likes: 6
From: Redondo Beach Ca
Instructor
Joined: Sep 2005
Posts: 199
Likes: 0
From: Chesapeake VA
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