New oil pump time........
Thread Starter
Joined: Sep 2004
Posts: 3,212
Likes: 1,612
From: Michigan & Florida
New oil pump time........ Ok guys, I have a question. As some here know I'm rebuilding (again) my LS7 heads. I ran a Melling 10296 oil pump previously. Block has 8 piston squirters, which lowered the hot oil pressure@7,000rpm to approximately 50lbs. Pump is worn some (80,000 miles in 19 years), so I was going to buy a new 10296. I talked to @Che70velle about this and we agreed this should be good. New pump might bring pressure up 3-4lbs. BUT, something has changed since I talked to Scott. Tony Mamo is doing the heads/cam. But what has changed is Tony is recommending Johnson 2110 drop in lifters. I've researched these and it seems they tend to bleed off maybe 5lbs of oil pressure. This would put pressure down even a bit more, probably just under 45lbs@7,000rpm. I'm thinking thats a bit too low. Wondering if I should get the 10296 and run the high pressure spring, or get the Melling 10355?? What do you guys think? Thanks, I value your inputs.......
Thread Starter
Joined: Sep 2004
Posts: 3,212
Likes: 1,612
From: Michigan & Florida
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
Not yet. He is a great guy to work with, but he is so busy I hate to keep contacting him. I will run it by him before I buy, but wanted some opinions here, too. What do you think, Gary? My cam bearings look great at 53,000 miles, which kinda surprised me, backing up what Scott and I thought about 50lbs being OK. But if I lose another 5lbs, Im not so comfortable with 45lbs@7,000rpm......
A lot of flow at a slightly lower pressure shouldn't be TOO big a deal.
Tony IS a great guy who does NOT begrudge the time spent with customers. That's how he became who he is, besides knowing more than anyone about head flow... lol!
Call him anyway. This is important enough to bend his ear.
TECH Enthusiast
Joined: Feb 2018
Posts: 640
Likes: 297
From: Michigan
If you have piston squirters, you may want to look into whatever people are running on Gen 2 CTS-Vs and 5th gen ZL1s with the LSA block. I'm not sure what those guys are using but I know they need more volume because of the factory piston squirters.
I can give you some idea from where I’m at on my build. I’m running a modified dod pump in my lsa block with 2116 lifters. Engine still being broken in, so I don’t have good oil psi figures except with the break in oil.
pump is a Schumann, has the block to pump oring seal, ball bearing relief, purple spring, and ported entry/exit.
block is setup with .020-.021 rod clearance and mains, with the exception of #5 main is .015.
I ported all the internal oil areas of the block I could reach. Basically rounded any corners, smoothed the crossover surfaces, port aligned any holes, and did same to oil pan ports.
Improved racing oil barbell fitted, and pan filter bypass deleted.
startup is a solid 60psi cold on the br5 5-30 breakin oil.
last outing where I was doing some harder pulls and really got the oil up to temp idle dropped to about 25psi and the 50’s in upper rpm range.
engine has about 20mi on it now, and I’ll be changing this oil. Im going to do another round of br5 oil on it for 4-500 and go to m1 0w-40.
pump is a Schumann, has the block to pump oring seal, ball bearing relief, purple spring, and ported entry/exit.
block is setup with .020-.021 rod clearance and mains, with the exception of #5 main is .015.
I ported all the internal oil areas of the block I could reach. Basically rounded any corners, smoothed the crossover surfaces, port aligned any holes, and did same to oil pan ports.
Improved racing oil barbell fitted, and pan filter bypass deleted.
startup is a solid 60psi cold on the br5 5-30 breakin oil.
last outing where I was doing some harder pulls and really got the oil up to temp idle dropped to about 25psi and the 50’s in upper rpm range.
engine has about 20mi on it now, and I’ll be changing this oil. Im going to do another round of br5 oil on it for 4-500 and go to m1 0w-40.
Ok guys, I have a question. As some here know I'm rebuilding (again) my LS7 heads. I ran a Melling 10296 oil pump previously. Block has 8 piston squirters, which lowered the hot oil pressure@7,000rpm to approximately 50lbs. Pump is worn some (80,000 miles in 19 years), so I was going to buy a new 10296. I talked to @Che70velle about this and we agreed this should be good. New pump might bring pressure up 3-4lbs. BUT, something has changed since I talked to Scott. Tony Mamo is doing the heads/cam. But what has changed is Tony is recommending Johnson 2110 drop in lifters. I've researched these and it seems they tend to bleed off maybe 5lbs of oil pressure. This would put pressure down even a bit more, probably just under 45lbs@7,000rpm. I'm thinking thats a bit too low. Wondering if I should get the 10296 and run the high pressure spring, or get the Melling 10355?? What do you guys think? Thanks, I value your inputs.......
Trending Topics
If you’re worried about the lifter, katech sells an “true” sized 2110.
#2110K
https://katechengines.com/i-30497677...t-drop-in.html
#2110K
https://katechengines.com/i-30497677...t-drop-in.html
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Verdad Gallardo Thread Starter
Joined: Sep 2004
Posts: 3,212
Likes: 1,612
From: Michigan & Florida
Thread Starter
Joined: Sep 2004
Posts: 3,212
Likes: 1,612
From: Michigan & Florida
I can give you some idea from where I’m at on my build. I’m running a modified dod pump in my lsa block with 2116 lifters. Engine still being broken in, so I don’t have good oil psi figures except with the break in oil.
pump is a Schumann, has the block to pump oring seal, ball bearing relief, purple spring, and ported entry/exit.
block is setup with .020-.021 rod clearance and mains, with the exception of #5 main is .015.
I ported all the internal oil areas of the block I could reach. Basically rounded any corners, smoothed the crossover surfaces, port aligned any holes, and did same to oil pan ports.
Improved racing oil barbell fitted, and pan filter bypass deleted.
startup is a solid 60psi cold on the br5 5-30 breakin oil.
last outing where I was doing some harder pulls and really got the oil up to temp idle dropped to about 25psi and the 50’s in upper rpm range.
engine has about 20mi on it now, and I’ll be changing this oil. Im going to do another round of br5 oil on it for 4-500 and go to m1 0w-40.
pump is a Schumann, has the block to pump oring seal, ball bearing relief, purple spring, and ported entry/exit.
block is setup with .020-.021 rod clearance and mains, with the exception of #5 main is .015.
I ported all the internal oil areas of the block I could reach. Basically rounded any corners, smoothed the crossover surfaces, port aligned any holes, and did same to oil pan ports.
Improved racing oil barbell fitted, and pan filter bypass deleted.
startup is a solid 60psi cold on the br5 5-30 breakin oil.
last outing where I was doing some harder pulls and really got the oil up to temp idle dropped to about 25psi and the 50’s in upper rpm range.
engine has about 20mi on it now, and I’ll be changing this oil. Im going to do another round of br5 oil on it for 4-500 and go to m1 0w-40.
I would stay with 10296 (seems to be working for you)and try the copo spring
I would take it apart and port it.
I’m in the process rebuilding my engine /myself I think .0015 rear bearing clearance is a little tight for for my taste #5 main
i shoot for.0025 on #5 and 3# thrust bearing you have a lot of weight swings on the back of the crank
not trying to start anything
I would take it apart and port it.
I’m in the process rebuilding my engine /myself I think .0015 rear bearing clearance is a little tight for for my taste #5 main
i shoot for.0025 on #5 and 3# thrust bearing you have a lot of weight swings on the back of the crank
not trying to start anything
Staging Lane
Joined: May 2023
Posts: 90
Likes: 71
I would talk to Tony about it. I ended up using one of his ported oil pumps in my build. You can't go wrong with him if he's already doing the heads etc. We used a ported Melling HV pump with ST2126 lifters. I do not have squirters though 70# at 6850 rpm
On The Tree
Joined: Oct 2011
Posts: 126
Likes: 44
From: Colorado
With a massaged 10296 pump on my LSA block w/ oil squirters, I switched to 10w40 from 10w30 oil to make the pressure curve better track 10 PSI/1000 RPM. With 0.0022" rod and 0.0018" main clearances, I now get 60 PSI at 6K RPM hot with the "normal" pressure spring.
If you’re worried about the lifter, katech sells an “true” sized 2110.
#2110K
https://katechengines.com/i-30497677...t-drop-in.html
#2110K
https://katechengines.com/i-30497677...t-drop-in.html
According to Katech, this fixed the drop in oil pressure they were seeing on some engines.
I have some of these in my new engine. I pulled a new set of the regular version to put these in. They are definitely higher tolerance and more consistent than the regular version from Johnson.
According to Katech, this fixed the drop in oil pressure they were seeing on some engines.
According to Katech, this fixed the drop in oil pressure they were seeing on some engines.
