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Engine - Turbo & Block Modifications and upgrades to maximize your Dodges turbo output & Improving strength and durability - pistons to crank.

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Old 03-25-2012, 02:03 PM   #1
Low oil pressure  
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Ok, what am I missing here ? @ years ago I did a T2 conversion and a fresh rebuild on the block ( rotating assembly and all ) . Turbo went bad last fall, replaced it . Have new turbo, bigger injectors, new turbo feed line with in line filter. Car runs great. One problem....low oil pressure after it gets warm.
Thought maybe just to light of oil (5w-30) . swapped out to 15w40. Still drops. Thought it may be the guage so I put a mechanical in line.....reads 60psi at start up after a mile or so of driving drops to 25psi or so. lDrive a little more , drops to 2-3 psi. What gives??? I put a new Melling pump in when I did the rebuild. Didn't have any noticable pressure issues before the turbo went bad.
Also the Engine is running nice and cool, never going over the 185 mark
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Old 03-25-2012, 02:34 PM   #2
Re: Low oil pressure  
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This low reading is only at idle.....over 1000 rpm it is fine, usually around 40 psi
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Old 03-25-2012, 08:34 PM   #3
Re: Low oil pressure  
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Quote:
Originally Posted by 2pt2 View Post
Ok, what am I missing here ? @ years ago I did a T2 conversion and a fresh rebuild on the block ( rotating assembly and all ) . Turbo went bad last fall, replaced it . Have new turbo, bigger injectors, new turbo feed line with in line filter. Car runs great. One problem....low oil pressure after it gets warm.
Thought maybe just to light of oil (5w-30) . swapped out to 15w40. Still drops. Thought it may be the guage so I put a mechanical in line.....reads 60psi at start up after a mile or so of driving drops to 25psi or so. lDrive a little more , drops to 2-3 psi. What gives??? I put a new Melling pump in when I did the rebuild. Didn't have any noticable pressure issues before the turbo went bad.
Also the Engine is running nice and cool, never going over the 185 mark


I've seen similar problems in the past. When I freshen an engine up, I usually go with a high volumne unit. Not high pressure but high volume. Before you condemn the pump though, make sure the pick up screen is clean. Since your turbo grenaded, junk from it may be laying in the oil pan and sucking up against the screen on the pick up for the oil pressure. It may be as simple as cleaning the oil pan. I can think of other things that might cause this but try the simple (and cheap) first.
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Old 03-25-2012, 08:37 PM   #4
Re: Low oil pressure  
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tryingbe is keeping our cars running
2-3psi of oil pressure at idle will kill the engine and turbo FAST.
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Old 03-25-2012, 09:32 PM   #5
Re: Low oil pressure  
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60 cold is good. After it warms up, you should get roughly 10 psi per 1000 rpm. At idle, it shouldn't be any lower than about 7-10 psi when hot. I've heard of folks getting 4-5 psi, but that would make me nervous. 2-3 is way too low. Have you been losing any oil? Check the high pressure line to the turbo. Also check the pan for material like OL said. And while you're in there, see if maybe the oil pump you replaced isn't seated flush to the block. I've heard tales of people replacing the pump and it not mating flat to the block surface.
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Old 03-26-2012, 06:40 AM   #6
Re: Low oil pressure  
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Pulled the pan, cleaned the screen, new oil return and feed. Pump has been on since the rebuild, no problem till swapped on new turbo. Thinking of running a motor flush ...any thoughts on that ??
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Old 03-29-2012, 07:28 PM   #7
Re: Low oil pressure  
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Spun the week old Bosch oil filter off tonight and spun on a Purolator P1. Oil pressure maintains higher , for a longer period of time. only occasionally dips to 4 or 5 at idle. Consistently 40-50 thru the RPM's.....
I am going to pull the Earl's inline off my turbo feed line this week and and look to see if any contaminants became lodged in it.
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Old 03-29-2012, 08:57 PM   #8
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I have a 89' Daytona T2, anyone know where I should purchase a high volume oil pump?
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Old 03-29-2012, 09:37 PM   #9
Re: Low oil pressure  
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I have a 89' Daytona T2, anyone know where I should purchase a high volume oil pump?
www.FwdPerformance.com
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Old 03-29-2012, 09:56 PM   #10
Re: Low oil pressure  
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Thats still wayyyyy to low at idle. I have about 5 cars with mechanical gauges and they all read from 17-25psi at HOT idle. What happens on your mechanical gauge when you are in throttle at cruising speed? Does it go down before up? It should go up to 45-55psi when at HOT cruising speed and not go down ever. Check that and if it goes down anytime during acceleration you might want to look at the main bearings.


Also FYI there are really no such thing as a "high volume" pump. The only ones available are the M118(re-boxed for many different manufacturers) and the factory Mopar pump.
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Old 03-30-2012, 06:12 AM   #11
Re: Low oil pressure  
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It goes up .....that what bothers me. I have good oil pressure driving 40-50. Cold start up 60plus. Hot idle it is around 4-5. Brand new motor ( less than 5000 miles , new rotating assembly , line bored , etc. ) then the old turbo shit the bed last fall. Put on new turbo and this is where I'm at......
the pump is a Melling HV , and is working, just no pressure at hot idle.
When I pulled that adaptor out that holds the sending unit(s) for the rebuild, could I have thread it back in to far and that be causing a restriction ???
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Old 03-30-2012, 08:03 AM   #12
Re: Low oil pressure  
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Have you tried a different mechanical gauge?
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Old 03-30-2012, 08:13 AM   #13
Re: Low oil pressure  
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thats what I'm going by....
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Old 03-30-2012, 08:56 AM   #14
Re: Low oil pressure  
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I think he means a 2nd mechanical gauge
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Old 04-13-2012, 11:08 AM   #15
Re: Low oil pressure  
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Just curious how this played out?
I have a similar issue
Cheers
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