Bowtieman4life

iTrader: (1)

It goes up to 42 lbs at 1500 RPMS but as soon as I drop to idle it drops to 18lbs. At 3000 RMPS it has 58 lbs. We were really careful and placed the o ring on the pipe before we installed it. I had a combo of oil(2 quarts 10/40 2 q 5/30 and 2 q 10/30 and the oil pressure was fine. It stayed right at 39. I had the oil changed with 6 quarts of 5/30 and it dropped immediately to 21lbs and then 18lbs. Its a new blue printed and ported oil pump from Scoggie Dickens. Any help will be appreciated.

Now that I think about it I only checked it a cold start up and at driving speeds before the oil change. It may have been a 18 before as well. I get 40 at cold start up but drops to 18 at warm start up or idle.
Something else, I should mention. I installed a double timing chain that required that I add small spacers to the oil pump. I wonder if this added distance is causing the problem.

bdawg/98mechamta#9

oil pump pick up tube O ring
mine does the same thing when its warm

LOnSLO

iTrader: (15)

yep, pinched oil pump O-ring

Krazy98Z28

iTrader: (12)

Dont always assume that. We thought my car had a bad oring turns out the pump was bad. Could also be the pump isnt installed correctly

Bowtieman4life

iTrader: (1)

I added some info. Please read and respond. I don't want to take it apart again but if I do, I am going to install a new pump.
Thanks

Bowtieman4life

iTrader: (1)

ttt

TaTommyWS6

Keep in mind, 15psi is supposed to be fine at idle. (I think 5psi would still be safe at idle, not that I wouldn't not freak out if I saw that on my car!)
Why not try running 2 quarts of 20w50 and 4 quarts of 5w30. That's what I do and it seems to really increase the pressure.

The only reason I am not jumping on the "o-ring bandwagon" is because you said you were very careful installing the o-ring and pump, so why rip everything apart unless you have to.

Good luck.

Tommy

LOnSLO

iTrader: (15)

If you are 100% sure that you installed the Oring correctly, then you have pump problems. 18psi I would consider OK at idle. Are you saying that now you only have 18psi across the board? What is your pressure at 2000rpm?

DanZ28

iTrader: (5)

You can be very careful with the o-ring and still pinch it. You can't see what your doing really when you only drop the oil pan an inch and your not putting the tube back in the oil pump perfectly straight when the pick up is still bolted to your block on the other end. I did a little test when I had my block out and saw the o-ring get pushed sideways and start to pinch, it's really not that hard to do. I was careful when I did my original cam install, the oil pressure was good, but when I pulled the pump out later, the o-ring was cut, and a little chewed up. Maybe it's the pump, but a better chance it's the o-ring IMO...

Dan

Bowtieman4life

iTrader: (1)

I get 42 at 1500 rpms and 58lbs over 3,000 rpms. Weird. I called Scoggie Dickens and they said chevy won't even change your pump until it goes below 5lbs at idle.

-Joseph-

iTrader: (12)

Thats not a stock GM oil pump though. You should have about at least the same oil pressure your old pump did, usually you would have more. The lowest I've seen with no problems has been ~25psi at idle with a stock pump.

First thing to check would be the o-ring, did you use a new o-ring? I've been using a film of grease to keep the o-ring in place, and it also helps prevent cutting the seal when its being installed in the pump.

BigTex

iTrader: (16)

Wasn't there a post a while back where someone bought a ported oil pump but before he installed it, he found the pump was assembled incorrectly?

Cal

iTrader: (1)

Since the problem changed after you changed oil, I'd say the presure relief valve picked up some debris causing it to not close all the way. If you take it appart, you can also use rtv sealer on the pickup tube flange to help it seal. I put some rtv on the o-ring as well to help hold it in place and lubricate it a bit for the install.

Cal

iTrader: (1)

Yes the gear impeller was installed upside-down. Before I installed mine, I disassembled the pump and made sure the dot was up. This person claimed that the pump won't even turn that way, so that's probably not his problem.

DEEZ98Z

iTrader: (5)

I bought a Ktech pump and my pressure at cold idle is around 45-50 warm idle 40 and WOT 60 or so. Just to give you something to go by. Good luck.

bfly

iTrader: (2)

hell my stock pump is at 55 at idle and 65 pluse at wot. i have a 01 good luck

Bowtieman4life

iTrader: (1)

Something else, I should mention. I installed a double timing chain that required that I add small spacers to the oil pump. I wonder if this added distance is causing the problem.

VSGLS1

iTrader: (8)

Ok, I will be doing the double roller in a few weeks. I was thinking of using something like vasoline to keep the O-ring situated while I reassembled the pump to the pick up tube. I guess grease would also hold it snug while working the pick up tube into the oil pump. Any other suggestions from people who have done this? TIA

CAT3

iTrader: (9)

1)What is your idle rpm? If it is low than the pressure will be as well.

2)Did you change the cam, or a shop? You may have scratched up the cam bearings. It only takes a little scratch.

3) Why are you mixing oil? If you take 2 of this and 2 of that and throw another 2 of WTFE in it, you can do the math and say Damn Mobil 10/30 is perfect! Try the 10W/30. Seriously now, you have 4 qts that go down to 10W when warm, and 2 that go to 5, law of average says 10. Then you have 4 @ 30w and 2 at 40W =30.

Bowtieman4life

iTrader: (1)

I was going to change the oil right away so I grabbed what I had on the shelf in my garage. I have 5/30 in it now. Please respond to the double chain.

Also, if you disconnect the pick up tube. It is safer and easier to place the o ring as far down as you can on the pick up tube instead of on the oil pump.