What is the normal oil pressure??
Login  | |
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 5:56:44 AM
|
|
|
portcqb
Posts: 410
Joined: 3/13/2008
Status: offline
|
I have the knock also for a second or so I think its due to the remote filter and normal after it sits for a night. As for the pressures on 5W30 Q-state torque power full syn in the winter I get 60 cold and 40ish hot. In the summer normally my cold is liike 55 and hot 35. 20PSI is still plenty for idle as long as when RPM's go up it goes up I think your fine.
_____________________________
1997 Olds Bravada AWD 4.3L Auto ~35,100mi(high idle time), CAI, Quad Beam Moded Mod
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 6:11:42 AM
|
|
|
rriddle3
Posts: 1555
Joined: 12/22/2006
From: Fort Worth,Texas
Status: online
|
I agree, the pressure appears to be within the acceptable range. If you're using 5W30 and have the start-up noise, try 10W30 next oil change and see if that makes a difference.
_____________________________
2002 Blazer LS 4dr 2WD Auto Trans
Hypertech PP III Programmed
Flowmaster 50 Series Delta Flow Muffler, C6 Corvette Exhaust Tip
TYC Elegante carbon fiber tail lights
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 3:00:16 PM
|
|
|
blazinrebel
Posts: 91
Joined: 3/26/2008
Status: offline
|
as for the knock, by what you said i would go with a thrown rod bearing. same thing happened to my truck. the reason that it only happens with ur truck sits is because there is no more oil in the engine so it is just metal on metal rattling in the engine. pain in the ass to replace and if not done proper can f**k up the engine.
_____________________________
'93 Chevy Blazer (Full-Size) two-door
350 small block
4x4
JL Audio Sub and Amp
Custom Camo Interior
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 4:05:03 PM
|
|
|
4x4blazerguy
Posts: 194
Joined: 3/9/2008
From: EXIT 105
Status: offline
|
Thanks for the responses. It doesn't sound like a rod knock, if a rod is going it will knock pretty regular. When I changed to oil about a 500 miles ago after changing it there was no knock at all on start up. Has anyone had a knock from the injectors at cold start? I've been told the Vortec is known for a slight knock at start up caused by the injectors. I have had two different mechanics tell me this. The other thing that came up is I have run NAPA oil for years & a mechanic I know just built a Chevy V8 & put in Napa oil and had trouble with a breaking down of the oil (hot). The presure was fine cold but as the engine heated up the pressure would drop. He said the oil was real thin hot. He said he changed it out and went with Valvoline & it cleared up the problem, plus the oil hot was thicker as it should be. 10-30 oil should be 10wt cold, & 30wt hot.
I drained a little out of the engine today to look at it and it is as thin as water hot.
Anyone else have an experience with this? Tomorrow I'm changing the oil to a different brand Mobil 10-40 change the filter & see what happens. This truck has got me gun shy with all the problems I have experienced. I don't want to lose an engine over oil.
Thanks,
Craig
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 6:25:17 PM
|
|
|
Hanr3
Wheels & Tire Moderator
Posts: 3523
Joined: 5/11/2005
Status: offline
|
I didn't read all the responses so this may have been covered already, bu there is my .02.
10psi per 1000rpm is GM recommended minimum.
If your getting noise upon start up after its cold, what filter do you use? The proper filter has a check valve in it to hold oil in the engine while it is off. Withuot the checkvalve the oil drains back into the pan.
Typically 40psi is normal at idle and it should go up 10 psi per 1000rpms above that, if your losing oil pressure at higher rpm's? I prefer to run a can of Marlevous Marvins Mystery oil through the oil system just before an oil change. I do that for 2 oil changes in a row. The MMM oil is pretty much Kerosene, and it cleans out all the sludge built up in teh engine. I do this once every 100,000 miles. There are other chemicals taht you can use, MMM is the one I use and have been for a long time.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 6:35:43 PM
|
|
|
4x4blazerguy
Posts: 194
Joined: 3/9/2008
From: EXIT 105
Status: offline
|
I run Wix filters. But that is a thought I hadn't thought about. Are the AC Delco filters at WalMart OK?
Thanks
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 6:58:20 PM
|
|
|
rriddle3
Posts: 1555
Joined: 12/22/2006
From: Fort Worth,Texas
Status: online
|
Stay with the Wix, you're not going to find a better oil filter, period. Now let's talk about oil for a minute. Oil does not get thicker as it heats up. If you have any doubts, put some in a pan and pour just a little out, noticing its thickness. Now, heat the oil that's left and pour some out. Is it thicker than before? No, it is thinner, this is basic chemical physics. The naming of oil with the 'W' in it was done just as a simple way to convey the viscosity properties when multi-weight oil came out. The easiest way to think of it (in the case of a 10W30) is that it is a 30 weight oil that has the cold pumping qualities of a 10 weight oil, not a 10 weight oil when it's cold that changes to a 30 weight when it heats up. Confusing - it can get even more so, but this is the Cliff Notes version.
_____________________________
2002 Blazer LS 4dr 2WD Auto Trans
Hypertech PP III Programmed
Flowmaster 50 Series Delta Flow Muffler, C6 Corvette Exhaust Tip
TYC Elegante carbon fiber tail lights
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/22/2008 9:27:03 PM
|
|
|
4x4blazerguy
Posts: 194
Joined: 3/9/2008
From: EXIT 105
Status: offline
|
quote:
ORIGINAL: rriddle3
Stay with the Wix, you're not going to find a better oil filter, period. Now let's talk about oil for a minute. Oil does not get thicker as it heats up. If you have any doubts, put some in a pan and pour just a little out, noticing its thickness. Now, heat the oil that's left and pour some out. Is it thicker than before? No, it is thinner, this is basic chemical physics. The naming of oil with the 'W' in it was done just as a simple way to convey the viscosity properties when multi-weight oil came out. The easiest way to think of it (in the case of a 10W30) is that it is a 30 weight oil that has the cold pumping qualities of a 10 weight oil, not a 10 weight oil when it's cold that changes to a 30 weight when it heats up. Confusing - it can get even more so, but this is the Cliff Notes version.
Great info thanks. For some reason in recent times NAPA oil has changed. Tomorrow the oil & filter will be changed I will see what happens after that. I took it to the shop next door. They did the fuel pump. I will keep you posted as to what is found.
Thanks again great info from all.
Craig
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 5:37:17 AM
|
|
|
portcqb
Posts: 410
Joined: 3/13/2008
Status: offline
|
Yah wix are fine I use AcDelco filters now since yah you definetly dont want FRAM stay away. As for 10-40 oil im not sure I would go to 10-40, but its up to you. I think GM only recommends 10-30 or 5-30. If you are in a really warm place 10-40 might be fine for me even 10-30 wouldn't work for most of the year.
_____________________________
1997 Olds Bravada AWD 4.3L Auto ~35,100mi(high idle time), CAI, Quad Beam Moded Mod
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 8:52:08 AM
|
|
|
Psychropod
Posts: 363
Joined: 5/23/2007
From: Baltimore, MD
Status: offline
|
What's wrong with Fram? I've been using 'em the whole time and haven't had a problem.
_____________________________
Raphael
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 9:13:16 AM
|
|
|
rriddle3
Posts: 1555
Joined: 12/22/2006
From: Fort Worth,Texas
Status: online
|
Here's my take on Fram:
They were once considered a standard in the industry, but about 10-15 years ago started developing a reputation for very cheap, poor construction and failure during service. Within the last 5 years or so their top-line models appear to have shown more control and quality in their construction, but the standard models have not improved. The oil filter is a part that I certainly would not want to leave to chance. The models that have improved have also had an increase in price and gimmickry, i.e. the added Teflon (PTFE) inside the filter media which is useless and perhaps harmful to the engine's internals.
I would rather pay a lower price and get filters with better reputations (Wix, Purolator, AC Delco). Bear in mind that I'm not saying you will kill your engine with Frams, I just choose not to chance it.
_____________________________
2002 Blazer LS 4dr 2WD Auto Trans
Hypertech PP III Programmed
Flowmaster 50 Series Delta Flow Muffler, C6 Corvette Exhaust Tip
TYC Elegante carbon fiber tail lights
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 9:23:37 AM
|
|
|
Psychropod
Posts: 363
Joined: 5/23/2007
From: Baltimore, MD
Status: offline
|
Point well taken. Frams no more...
_____________________________
Raphael
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 10:18:00 AM
|
|
|
nj4x4blaze
Posts: 1806
Joined: 8/5/2005
From: North Jersey
Status: offline
|
I've been running Fram Tough Guard for 4 yrs now and zero issues but I am going to look into that about fram. As for PSI when cold the truck is at 40 psi or sometimes higher and when hot at idle its sitting at 25 or 30 psi. Thats just an estimated psi when hot.
_____________________________
Dave- 01 blazer 4x4, 6" Superlift Kit,15x8 on 32''s and 20"x9" on 33''s,New Jersey Chapter
www.subsonickustomz.com
NJ,MI,IN,WI,IL,CO,MN,AZ,NC,
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 2:09:22 PM
|
|
|
4x4blazerguy
Posts: 194
Joined: 3/9/2008
From: EXIT 105
Status: offline
|
UPDATE:
Had oil & filter changed on the Blazer today. Went with Mobil 10-30 & added a 1/2 quart of Lucus. It seemed to make a world of difference in pressure. It is much more stable. In stead of just dropping from 40 PSI to 20 PSI when slowing down it drops slowly. I'm getting about 5-7 PSI better pressure. No knocking or noise anymore. I can't believe that the Lucas made that much differece. I went from 10-40 to 10-30 then added the Lucas. I'm no stranger to Lucas. I have run it for years in different vehicles. It makes some but not like I'm seeing now. So I believe that Napa oil have changed in the last serveral months.
Think about it, Napa oil 2.09/qt in the last 5 years it has gone from 1.89/qt to the present price. With oil going up as it has they can't keep a price low without cutting corners. I bought Valvoline today at Napa 3.29/qt.
I have always been one of these guys oil is oil, well Iam going to have to admit I may of been wrong. I will buy my oil from WalMart after this Napa is too high but I wanted to exchange some cases of Napa oil for Valvoline so I had to pay the higher price which is OK.
As for Fram Filters you guys are 100% correct. I know a mechanical engineer that did a personal test of some filters & he told me the worse filter on the market was FRAM PERIOD in his mind based on his personal test. So if an engineer feels that way I figured I better take notice.
Allied Signal bought FRAM, AUTOLITE, & SOME OTHER BRAND NAMES several years back I have seen BAD RESULTS of THEIR PRODUCTS over the years. AUTOLITE PLUGS are junk IMO. I put a set in an 02 Dakota 4x4 a few years ago with in 18,000 miles they were burned to nothing.
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 6:00:30 PM
|
|
|
Hanr3
Wheels & Tire Moderator
Posts: 3523
Joined: 5/11/2005
Status: offline
|
I prefer Castrol GTX (1st choice) or Valvoline oils and Fram filters.
been running Frams for 25 years or so without issue. Tahs two vehicles for 15 of those years and 5 vehciles for teh past 5 years. Zero issues.
My last 4.3L engine had 286,000 miles on it before I totaled out the vehicle. My current truck has 155,000 miles on it. Zero issues.
_____________________________
"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
|
|
|
|
|
RE: What is the normal oil pressure?? - 4/23/2008 7:10:18 PM
|
|
|
portcqb
Posts: 410
Joined: 3/13/2008
Status: offline
|
I didn't mean to turn this into a fram topic again, but yah as for filtering I really dont know if they are worse. There construction now is much worse I my mothers sable the flange warps with them(and on the taurus/sable forums this is very common issue) and I have had to practically tear apart the crumpled thin filter twice. If you have a little scale that measures to the oz you will see the weight difference among the filters. Hopefully this topic is done since 4x4 fixed his problems and it wont turn into another fram monster topic.
_____________________________
1997 Olds Bravada AWD 4.3L Auto ~35,100mi(high idle time), CAI, Quad Beam Moded Mod
|
|
|
|
|
Printable Version
