| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
09-02-2021, 05:06 PM
|
||||
|
||||
Strange oil pressure readings
Below 3000rpm oil pressure is great and steady at 40psi cruising. Once I get above 3000 it drops to 20psi until I lift a little then it will rise to 35 psi but drop again to 20/25 psi. This is cruising at 65mph at 3250rpm.
Any ideas? Could it be low oil level? I have trouble reading the level on my dipstick as it had to be modified to fit into the sump. Oil pump is a 60 psi one.
__________________
69 Firebird 472, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 10.90 @123 |
|
#2
09-02-2021, 05:52 PM
|
||||
|
||||
|
I suggest a low oil level where the pump is sucking air. A distant Knocking will soon come closer.
Need to add more oil, like 2-quarts. |
|
#3
09-02-2021, 06:29 PM
|
|||
|
|||
|
Before driving it anymore,drain the pan.Put the required oil(probable 6qt) in and MARK the level on your dipstick.Dont guess,do it right.Tom
|
| The Following 2 Users Say Thank You to tom s For This Useful Post: | ||
|
#4
09-03-2021, 06:16 AM
|
||||
|
||||
|
Sounds like either low oil level, or the pump pick up has moved .
Either way having only 20 psi at 3250 rpm is right on the edge of needing to call a flat bed truck to bring you home! As posted add 2 Qts and see what changes, if that does nothing then its pull the pan off time!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
| The Following User Says Thank You to steve25 For This Useful Post: | ||
|
#5
09-03-2021, 10:57 AM
|
|||
|
|||
|
Pump cavitation normally bounces the reading. Where are you taking this measurment from?
__________________
Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
|
#6
09-03-2021, 10:59 AM
|
|||
|
|||
|
Low oil level will show itself in a turn pretty quickly. You will drop to nothing.
__________________
Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
| The Following User Says Thank You to chiefbigb For This Useful Post: | ||
|
#7
09-03-2021, 11:36 AM
|
||||
|
||||
|
Chief I'm reading from the next to dizzy and as it goes over 3000 it does go up and down but only by 10 or so psi and stays low. Thats cruising at 60/65.
Doesn't seem a problem on turns as below 3000 it's fine. I'll add some more and see what happens. If the pick up has moved would it not show up on low revs?
__________________
69 Firebird 472, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 10.90 @123 |
|
#8
09-03-2021, 02:01 PM
|
||||
|
||||
|
Not certain but.....I installed Spotts Scraper plate with the baffled Pan and seems the engine does well around turns, and i have not been checking the level like a persnickity 455 of old with a baffled pan or windage tray and baffled pan.
Spare engine build just has the Canton baffled Pan, no windage tray, no scraper, due to Aluminum Rods. Pickups don't move: cannot move up due to pump base, cannot move down due to pan. Can only fall off.
__________________
12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
|
#9
09-03-2021, 02:11 PM
|
||||
|
||||
|
just had a racing buddy with oil pressure issue -- when the rpms went up the pressure dropped off ---- took it apart and there was a bunch of silicone bits in the pan and on the screen -- at higher rpm they were getting sucked up into the screen and reducing the pressure -- then fall down again at lower rpm ---
|
|
#10
09-03-2021, 03:01 PM
|
|||
|
|||
|
Check pressure at the filter base.
__________________
Be carefull of the feet you step on today.They may be attached to the a$$ you kiss tomorrow. |
|
#11
09-04-2021, 05:30 PM
|
||||
|
||||
|
Looks like it was low oil level. Put more in and was ok for the drive home. Had steady 45psi at 3500 revs and never dropped.
Had a head gasket go at the track so I've got work to do anyway over the winter. Might be time for a freshen up too.
__________________
69 Firebird 472, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 10.90 @123 |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
