Notices
Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

Oil pump wearing out?

 
Old 04-01-2019, 01:15 AM
  #1  
Launching!
Thread Starter
iTrader: (4)
 
1988montecarloss's Avatar
 
Join Date: Nov 2011
Location: maine
Posts: 248
Default Oil pump wearing out?

My LS1 makes about 32-33psi cold idle 17-18psi warm idle and 25-30psi warm cruise and 55-56psi warm at wide open throttle with 10w-30 oil which is low compared to some that Iíve seen although itís above the 6-10psi per 1000rpm guideline Iíve seen, could it be the oil pump is just worn from higher mileage? Or another issue?

I did just just recently change the oil and had no metal residue in the oil or oil filter so I donít think itís a bearing issue

i really donít wanna have to do an oil pump right now as this car is 1. currently my daily driver and 2. I plan on camming it later in the year and donít wanna have to tear the motor down in the car twice

could I go to a 15w-40 oil or similar? Or should I just buck up and do the pump now?
1988montecarloss is offline  
Old 04-01-2019, 05:44 AM
  #2  
Staging Lane
 
Polyalphaolefin's Avatar
 
Join Date: Mar 2019
Posts: 52
Default

I don't think the oil pump is your issue, nor the bearings. A sudden drop in pressure like this makes me want to think a leaking o-ring on the pickup tube or something of that nature.

Do not go to a more viscous oil chasing oil pressure. That creates more problems than what you're dealing with already.

In any case, get ready to drop the oil pan. Given that you have sufficient oil pressure still, it's not something I'd stress too much about. It should still be looked into, but your engine isn't going to seize at that pressure.

Honestly, your current pressure is exactly what I shoot for on a new engine.
Polyalphaolefin is online now  
Old 04-01-2019, 09:41 AM
  #3  
TECH Senior Member
 
Join Date: Jun 2016
Location: Central Cal.
Posts: 9,782
Default

I really don't see an issue here.
G Atsma is offline  
Old 04-01-2019, 12:17 PM
  #4  
Launching!
Thread Starter
iTrader: (4)
 
1988montecarloss's Avatar
 
Join Date: Nov 2011
Location: maine
Posts: 248
Default

Originally Posted by Polyalphaolefin View Post
I don't think the oil pump is your issue, nor the bearings. A sudden drop in pressure like this makes me want to think a leaking o-ring on the pickup tube or something of that nature.

Do not go to a more viscous oil chasing oil pressure. That creates more problems than what you're dealing with already.

In any case, get ready to drop the oil pan. Given that you have sufficient oil pressure still, it's not something I'd stress too much about. It should still be looked into, but your engine isn't going to seize at that pressure.

Honestly, your current pressure is exactly what I shoot for on a new engine.
okay thanks for the input! I guess I will hold off on doing it for now and keep an eye on it and just do it when itís time for the cam swap but just curious why do you shoot for those oil pressures instead of higher?

Originally Posted by G Atsma View Post
I really don't see an issue here.
Thats good to hear, This will make it a little easier to sleep at night haha
1988montecarloss is offline  
Old 04-01-2019, 01:34 PM
  #5  
Staging Lane
 
Polyalphaolefin's Avatar
 
Join Date: Mar 2019
Posts: 52
Default

Originally Posted by 1988montecarloss View Post
why do you shoot for those oil pressures instead of higher
Oil pressure is a lot like money. There's only so much you really need, and the rest is just for showing off.

The bare minimum pressure spec'd by GM is just 5.6 psi at 1000 rpm. I go for 2-3x that amount just to be safe or 12-18 psi at 1000 rpm. That's more than enough pressure to keep oil supplied throughout the engine. More than that is just robbing power and straining the oil pump.
Polyalphaolefin is online now  
Old 04-13-2019, 09:12 PM
  #6  
12 Second Club
 
MplSS's Avatar
 
Join Date: Oct 2003
Location: Mpls. Mn.
Posts: 88
Default

I bought my '98 ss in 2000 with 9500 miles, in 19 years of ownership, and 750 some odd 1/4 mile passes, the oil pressure has never wavered; 22 lbs. Hot idle, 44 lbs. Cold start up, and has never exceeded around 50 lbs. At wot. This has always been in the back of my mind, but I always find oil on rockers and in head valley's when I take the rocker covers off, so I let her buck. Good to know I'm not the only one with "low" oil pressure.
MplSS is offline  
Old 04-13-2019, 09:42 PM
  #7  
TECH Enthusiast
iTrader: (12)
 
Join Date: Jul 2014
Location: Traverse City MI
Posts: 642
Default

If it bothers you I would put in a higher pressure oil pump vs running heavier oil.
onebadbowtie86 is offline  
Old 04-14-2019, 12:38 AM
  #8  
11 Second Club
iTrader: (1)
 
01CamaroSSTx's Avatar
 
Join Date: Feb 2015
Location: Texas
Posts: 894
Default

If this engine has many miles on it then some wear is certain. O-ring on the pickup tube could be worn to the point that air is getting by decreasing oil pressure just as bearing wear has gotten to the point that your losing oil pressure. Running a heavier oil will increase the pressure some and I don't see that as a problem but its just a (X::X) on the problem. I've seen a sludge'd 5.3 that the screen in the oil pick up tube was caked in oil deposits and causing a restriction. You can keep squeezing what you can out of it but start preparing for an overhaul.
01CamaroSSTx is offline  
Old 04-14-2019, 11:03 PM
  #9  
Launching!
Thread Starter
iTrader: (4)
 
1988montecarloss's Avatar
 
Join Date: Nov 2011
Location: maine
Posts: 248
Default

Originally Posted by onebadbowtie86 View Post
If it bothers you I would put in a higher pressure oil pump vs running heavier oil.
Originally Posted by 01CamaroSSTx View Post
If this engine has many miles on it then some wear is certain. O-ring on the pickup tube could be worn to the point that air is getting by decreasing oil pressure just as bearing wear has gotten to the point that your losing oil pressure. Running a heavier oil will increase the pressure some and I don't see that as a problem but its just a (X::X) on the problem. I've seen a sludge'd 5.3 that the screen in the oil pick up tube was caked in oil deposits and causing a restriction. You can keep squeezing what you can out of it but start preparing for an overhaul.
yeah I will probably go with a melling m295 pump when I cam it, motor is pretty clean inside from what I can see with the valve covers and manifold off so I donít think thatís the issue but Iíll replace the o ring when I do the pump too to make sure
1988montecarloss is offline  
Old 04-15-2019, 05:15 AM
  #10  
TECH Senior Member
iTrader: (3)
 
99 Black Bird T/A's Avatar
 
Join Date: Nov 2001
Posts: 6,157
Default

It might be worth checking with a mechanical gauge first
The gauge in the car isn't always reliable.

Also if there is flicker in the headlights and bouncing needles in the gauge cluster ever few seconds it can be the alternator is failing (voltage regulator). My TA appeared to have flickering oil pressure and it was actually a failing alternator.
99 Black Bird T/A is online now  
Old 04-15-2019, 08:52 AM
  #11  
Launching!
 
Join Date: Jul 2015
Location: Chicago
Posts: 234
Default

Yes. Never trust an electrical gauge, ecpecially the OE gauge on a twenty year old car.
rednari2 is offline  
Old 04-15-2019, 11:04 PM
  #12  
Launching!
Thread Starter
iTrader: (4)
 
1988montecarloss's Avatar
 
Join Date: Nov 2011
Location: maine
Posts: 248
Default

Motor is in my 88 monte with a mechanical gauge hooked up to it, thought I had that in the original post
1988montecarloss is offline  
Old 04-15-2019, 11:18 PM
  #13  
TECH Senior Member
 
Join Date: Jun 2016
Location: Central Cal.
Posts: 9,782
Default

Originally Posted by 1988montecarloss View Post
Motor is in my 88 monte with a mechanical gauge hooked up to it, thought I had that in the original post
Bottom line- The pressures you mention in the first post are well within normal. There is nothing wrong there.
G Atsma is offline  
Old 04-15-2019, 11:21 PM
  #14  
Staging Lane
 
Polyalphaolefin's Avatar
 
Join Date: Mar 2019
Posts: 52
Default

Originally Posted by G Atsma View Post
Bottom line- The pressures you mention in the first post are well within normal. There is nothing wrong there.
QFT! Send it!
Polyalphaolefin is online now  
Old 04-16-2019, 11:42 AM
  #15  
TECH Fanatic
 
gagliano7's Avatar
 
Join Date: Aug 2005
Location: Monroe,NY
Posts: 1,946
Default

O-ring
gagliano7 is offline  
Old 04-16-2019, 01:38 PM
  #16  
TECH Enthusiast
iTrader: (12)
 
BlwnLs1GTO's Avatar
 
Join Date: Mar 2006
Posts: 536
Default

G Atsma beat me to it. I don't see any issue what so ever.

Run it until the engine does of old age. You're well within spec.
BlwnLs1GTO is offline  
Old 04-16-2019, 06:44 PM
  #17  
TECH Senior Member
iTrader: (3)
 
99 Black Bird T/A's Avatar
 
Join Date: Nov 2001
Posts: 6,157
Default

Originally Posted by 1988montecarloss View Post
My LS1 makes about 32-33psi cold idle 17-18psi warm idle and 25-30psi warm cruise and 55-56psi warm at wide open throttle with 10w-30 oil which is low compared to some that Iíve seen although itís above the 6-10psi per 1000rpm guideline Iíve seen, could it be the oil pump is just worn from higher mileage? Or another issue?

I did just just recently change the oil and had no metal residue in the oil or oil filter so I donít think itís a bearing issue

i really donít wanna have to do an oil pump right now as this car is 1. currently my daily driver and 2. I plan on camming it later in the year and donít wanna have to tear the motor down in the car twice

could I go to a 15w-40 oil or similar? Or should I just buck up and do the pump now?

Originally Posted by 1988montecarloss View Post
Motor is in my 88 monte with a mechanical gauge hooked up to it, thought I had that in the original post
I don't see that stated in your original post. It might be assumed based on your screen name but many members have several vehicles. A daily driver and weekend or strip car / truck is pretty common etc.

In any cash, depending on the age and condition of the mechanical gauge it may not be trustworthy either.

However, at this point I don't think there an issue based on what's been presented.
99 Black Bird T/A is online now  
Old 04-22-2019, 10:18 PM
  #18  
Launching!
Thread Starter
iTrader: (4)
 
1988montecarloss's Avatar
 
Join Date: Nov 2011
Location: maine
Posts: 248
Default

Thanks for the help and peace of mind guys, I will put an oil pump in it when I do my cam, should I do a melling m295 or just an oem gm pump?
1988montecarloss is offline  
Old 04-23-2019, 12:56 PM
  #19  
12 Second Club
 
mintws6's Avatar
 
Join Date: Aug 2014
Location: Houston, Texas
Posts: 119
Default

WS6 Store/RPM speed has a nice ported pump for an affordable price (less than one hundred bucks). Works well for me.
mintws6 is offline  
Old 04-23-2019, 01:13 PM
  #20  
Staging Lane
 
Polyalphaolefin's Avatar
 
Join Date: Mar 2019
Posts: 52
Default

The Melling M295 will work fine.
Polyalphaolefin is online now  
 


Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: