blk00ss

iTrader: (66)

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?

OUTLAWZ RACING

iTrader: (9)

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.

blk00ss

iTrader: (66)

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.

KMS.1320

iTrader: (1)

When you stab the gas does the oil pressure drop a bit before it rises?

blk00ss

iTrader: (66)

I ahvent drove it since. But have revved it up some, and I havent noticed it doing that

willyfastz

Did you check the bearing clearances when you put it together? If so what were they. Did you use the right cam retainer bolts? And deff. check the pickup O ring.

618HAWK

iTrader: (361)

Just throwing it out there, was the "BarBell" put back in the oil galley at the back of the block.

DCsLS1

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

DCsLS1

by the way i dont care if they call it RACING oil there is no and i mean NO racing car or team that uses thick oil like that

novaflash2002

iTrader: (51)

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.

shtnfrds

iTrader: (1)

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.

DCsLS1

yea man thick oil is bad stuff i use Q horsepower full synthetic 5w-30 amd it runs great.

WhiteRhino

iTrader: (6)

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.

DCsLS1

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

blk00ss

iTrader: (66)

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.

shtnfrds

iTrader: (1)

if TSP recomended that oil, then i'd call them and ask what the problem could be. or maybe the shop that did the assy.

novaflash2002

iTrader: (51)

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.

DCsLS1

how is thicker oil going to hurt anything? well 20w 50 has a viscosity of over 100 when cold where a motor needs a viscosity of 10 so you start your car and your moving parts are not well lubricated for a while causing wear i wasnt trying to "nut swing on oil types" just telling you 20w 50 is to thick royal purple makes great break in oil witch is only 10w 30

blk00ss

iTrader: (66)

no I haven't changed oil and filter yet. Going to tomorrow. The main clearances are from 2.4589-2.4587. And the rods are 2.0986-2.0988.

How probable would it be for a new oil pump to be bad?

novaflash2002

iTrader: (51)

thats preaty loose, but thel oil pump could have went bad but not that probable.