20PSI oil pressure in rebuilt motor.
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
So I just got my 404LS2 put back in my camaro. It has new diamond pistons, total seal rings, and all new bearings, new GM LS6 unported pump, ect. Well I got it fired up the other day and let it idle for a while(10 mins) to let it warm up before the test drive. It was holding 55PSI idleling. I take it up the road about a mile and turn around. I run it on up to around 4500rpms in first and second. then just go straight over to 5th and I notice the oil pressure is around 30psi at 2000rpms. I thought to myself that seems aweful low for a new motor....so I come to a stop and its idling at around 20psi. And I think to myself again, this IS to low.
So I park it, let it cool off and crank it up again to check cold idle pressure. What do you know, its still at 20psi. Well I rev it up a little and can only manage 40psi at like 3500rpms. There are no knocks or anything unusual sounds coming from the motor.
I havent changed the oil yet, but am going to tomorrow. Does anyone have any ideas on whats up guys?
So I park it, let it cool off and crank it up again to check cold idle pressure. What do you know, its still at 20psi. Well I rev it up a little and can only manage 40psi at like 3500rpms. There are no knocks or anything unusual sounds coming from the motor.
I havent changed the oil yet, but am going to tomorrow. Does anyone have any ideas on whats up guys?
#2
TECH Addict
iTrader: (9)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Im no expert on the matter but oil pressure in ls motors shows how much pressure is required to move the oil. Notice the differance on cold and warm psi. This factor can lead to synthic oil or dino weight. Dino oil will show higher oil pressure due to the more pressure to move it. Synthic will show less because of differnt blends in the oil. That being said what pressure spring did u use in the oil pump? I used the high pressure spring and see no less than 40 psi at idle and 70-80 at wot. I also use 0-w40 mobile 1. One other thing is the pick up tube rubber seal may be picnh wich is common.
#3
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
I am using Valvoline RACING oild 20w-50. And a bottle of the GM oil supplement. I have a STOCK oil pump. So no higher pressure spring or anything in there. after I change the oil and filter I'm going to go back into and check the o-ring.
I just dont see why it would of started with 50psi cold and now only be 20psi. And I just dont see how I could of spun a bearing so soon. It has maybe 20 minutes of run time all together.
I just dont see why it would of started with 50psi cold and now only be 20psi. And I just dont see how I could of spun a bearing so soon. It has maybe 20 minutes of run time all together.
Trending Topics
#8
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
20w 50????? why the hell are you running such a thick oil? you know that 5w 30 and 20w 50 have the same viscosity at operating temps? the difference is at start up where motors take the most wear and a 20w 50 is waaaaaaay to thick man you need to read this ASAP http://ferrarichat.com/forum/showthread.php?t=136052 and change your oil type soon
#10
TECH Enthusiast
iTrader: (51)
Join Date: Jul 2008
Location: Billings, Mt
Posts: 616
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
stay away from that valvoline ****. i have seen many engines lost from it. there is a little bar belle in the oil gally of the block. that may have been flipped around. also what were the bearing clearances ran on the engine. this would be useful information.
#11
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
20w 50????? why the hell are you running such a thick oil? you know that 5w 30 and 20w 50 have the same viscosity at operating temps? the difference is at start up where motors take the most wear and a 20w 50 is waaaaaaay to thick man you need to read this ASAP http://ferrarichat.com/forum/showthread.php?t=136052 and change your oil type soon
i agree. i put 20/50 in my 93 z28 years ago because i was told to by a buddy that i THOUGHT knew cars. in lees than two oil changes my motor started knocking and all kinds of noises.
#13
TECH Fanatic
iTrader: (6)
Join Date: Nov 2001
Location: NV
Posts: 1,224
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
This is a good post about VR1. https://ls1tech.com/forums/generatio...?highlight=vr1
I see alot of opinions about oil. Just take net advise with a grain of salt. Like the ones that say it's garbage, but never say why. Other than a buddy of a buddies used it, so it must be true. bobstheoilguy is a good place for info as well.
I see alot of opinions about oil. Just take net advise with a grain of salt. Like the ones that say it's garbage, but never say why. Other than a buddy of a buddies used it, so it must be true. bobstheoilguy is a good place for info as well.
#14
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
yea i have read alot alot about oil trying to find the best for my car and this is the best i found its written by a rocket scientist lol http://ferrarichat.com/forum/showthread.php?t=136052 check it out
#15
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The short block was assembled by a machine shop. The barbell oil plug is in. Also what would it matter if the can retainer bolts are the right ones? I used two longer bolts on the can sprocket. But they torques down fine and didn't bottom out. And yes I did use the right cam retainer bolts.
And about the oil...that is the exact oil that Texas speed reccomended me to use for break in. They have built quite a few motors so I took their word on it. I don't see how a thicker oil is going to hurt anything. Especially make me have LOWER oil pressure? This thread is bout suggestions on why by pressure is low, not nut swinging on oil types.
And about the oil...that is the exact oil that Texas speed reccomended me to use for break in. They have built quite a few motors so I took their word on it. I don't see how a thicker oil is going to hurt anything. Especially make me have LOWER oil pressure? This thread is bout suggestions on why by pressure is low, not nut swinging on oil types.
#17
TECH Enthusiast
iTrader: (51)
Join Date: Jul 2008
Location: Billings, Mt
Posts: 616
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
no oil goes through the center of the cam, so that would not matter. a little more than it was assembled at a machine shop would help. the clearnaces should be between 1.5 and 3 thousandths. if it is ran loose it would have low oil pressure. one other thing, have you changed the oil and filter and got the same oil pressure? because if it is cold out with a thicker oil and a run of the mill oil filter, it will bypass the oil filter and damage it inside. its hard to explane this in typing, but it has a crush sleeve in cheaper oil filters and a spring in upper quality filters.
#18
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
The short block was assembled by a machine shop. The barbell oil plug is in. Also what would it matter if the can retainer bolts are the right ones? I used two longer bolts on the can sprocket. But they torques down fine and didn't bottom out. And yes I did use the right cam retainer bolts.
And about the oil...that is the exact oil that Texas speed reccomended me to use for break in. They have built quite a few motors so I took their word on it. I don't see how a thicker oil is going to hurt anything. Especially make me have LOWER oil pressure? This thread is bout suggestions on why by pressure is low, not nut swinging on oil types.
And about the oil...that is the exact oil that Texas speed reccomended me to use for break in. They have built quite a few motors so I took their word on it. I don't see how a thicker oil is going to hurt anything. Especially make me have LOWER oil pressure? This thread is bout suggestions on why by pressure is low, not nut swinging on oil types.