ZDECKICH
Well-Known Member
Noise is still there.
383 low oil pressure
- Thread starter ZDECKICH
- Start date
furious70
Well-Known Member
I agree put a high volume pump on it.
But that noise might be something else entirely
But that noise might be something else entirely
ZDECKICH
Well-Known Member
Ill try and take the video of the noise today. Looks like a PITA to take the oil pan off.
If you think getting the pan off is a pain? Better rethink trying to fix it in the car. In the last week my pan has been off, cam was damaged, new cam checked for spec and degreed, valve springs pressure checked, checked for coil bind, (required master cylinder removal, built a new windage screen, headers off and resealed, All in the car. Just depends how hard you want to work.
Doug
mopar 3 B
Well-Known Member
- Local time
- 12:50 PM
- Joined
- Aug 25, 2014
- Messages
- 11,585
- Reaction score
- 8,920
- Location
- Kingsville, MO
You have checked the flex plate bolts and torque converter bolts for clearance. Used the correct length starter bolt and stud? If so it stethoscope time. Move it around till the source is found.
diesel_lv
Well-Known Member
Big block not that bad. Jack car up n put on stands. Disconnect one side of center link n swing out of the way. Unbolt pan n if I remember correctly, drops right out.
- Local time
- 10:50 AM
- Joined
- Apr 13, 2012
- Messages
- 39,078
- Reaction score
- 142,761
- Location
- Granite Bay CA
I had a thread here where I was dealing with a similar issue.
I had 39-40 psi at 70 mph which for me is around 2000 rpms. This is almost double the old suggestion of 10 lbs for every 1000 rpm. To me, that still seemed low by Mopar standards. I tried a standard volume oil pump in my engine under the false belief that the higher volume pumps eat power and delivered pressure that was excessive. Looking at a gauge reading LESS than you're used to seeing is not comforting.
1MYTGTX
Well-Known Member
I concur with that. The HV pumps definitely put you at 70+ psi at speed. Standard pumps is 40 psi
Now this is an area that can be tailored. Though not necesary. There is nothing the matter with 70 psi. The power loss is miniscule. How ever by using a lower pressure relief spring, adjustable relief spring plug, or trimming the length of the relief spring will lower the upper rpm pressure. The relief spring in my racecar pump is so short it rattles. The lifter bore clearance is .0015". Had to trim the spring to get the pressure down to about 75 psi hot with 25 weight oil.
Doug
How much oil pressure would you have without the short spring? What makes your oil pressure so high? Just curious. My 440 runs around 80 psi with a high volume pump.
Thanks
Close to 100 psi Lifter bores are a huge internal leak, especailly when worn.
Doug
ZDECKICH
Well-Known Member
So this past weekend I changed the pump for a stock volume and pressure pump and pick up tube. Cold start it goes to 40psi and hit idel it goes to 5psi. Barley registers on the factory gauge. Any ideas? Motor seems to run fine and no blue smoke from the exhaust. Bad bearing or oil galley plug?
I don't think it has a bad bearing or a missing oil galley plug. I think the oil pump you put on would work perfect if it was bolted to a new engine. But it's bolted to an engine that I'm sure has massive oil demands. I think the engine new had .0015"-.002" main and rod clearances. My guess is yours are double that. Your lifters are in 16, 50 year old lifter bores. Do you think the lifter bores haven't worn in over 50 years? I've primed those kind of blocks before. You can't imagine how much hot oil goes past them when it's running. I'll take a guess and say your oil demand has at least doubled. But you didn't think about that. You were thinking, hey a new oil pump should fix me, right. No it shouldn't. Your oil demand has changed. Just like it has for 1,000's of other people. Many people have low hot oil pressure. Put a HV pump on it and let's see where you are at. A HV pump only has 25% longer rotors so don't expect a miracle. You might have to go with thicker oil too. And that's not a bad thing. Don't let this get you down. It's a learning experience we all have to go thru. Everything is going to be alright.
ZDECKICH
Well-Known Member
So, when I bought the car, I was told the engine was rebuilt. Don't know if its true or not as the guy lied to me on a bunch of things. Maybe his version of rebuilt was paint it and make it look new. I changed the pump and pickup tube as I figured it was an easy and fairly cheap way to see if he used an old pump and packed or pinched pick up tube. I also went with 20w50 VR1 for the oil. The oil pressure on a cold start improved but hot idle the gauge reads 0. Hooked up a mechanical one and it would dhow 5psi
ZDECKICH
Well-Known Member
Here is a video I took after I drove it around for about 10min. Car also drives fine and smooth and no white smoke.
Here is the oil pressure at cold start up.
Here is the oil pressure at cold start up.
Dave6T4
Well-Known Member
- Local time
- 1:50 PM
- Joined
- Dec 31, 2020
- Messages
- 7,921
- Reaction score
- 18,160
- Location
- Ontario, Canada
Cam bearings or lifter bores.
I still say everything could be fine. When people get low hot oil pressure they think they have a "bad" oil pump. No. These oil pumps almost never give it up. I started a 55 year old Road Runner with the original oil pump a few months ago. The pressure relief was stuck. I don't know how much oil pressure it made, I'm guessing over 120psi. It ballooned up the filter, then blew the rubber filter gasket out and dumped all of the oil on the ground. It looked like a 3 stooges movie. I tore down the oil pump, the gears were all gouged up. You would wonder if it would make any pressure. I wonder if I have ever seen a "bad" pump. It's usually something else. I'm still under the impression that there is nothing wrong with your car. I think it is over 50 years old, it's oil volume needs have changed, and you aren't listening to what it is saying to you loud and clear. It's saying, "Why did you come home with a stock volume oil pump when I already have one of those? Can't you see my gauge? Read my lips. My needs have changed, my clearances have increased from old age, you know you ain't the man you used to be either dude. Now go get me a HV oil pump like I clearly told you I wanted."
Last edited:
Back in the day a friend of mine had a unknown history 440 that he put into his 70 Coronet. Motor ran great, quiet without ticks or knocks, but oil pressure as you described. Hot idle was always a little under 10psi.
He decided to just beat the thing until the motor showed any symptoms. That car ran 5 or 6 years without issues and he sold it as it was to another friend. That guy continued to run that motor until he did something very stupid and took out a light pole.
He decided to just beat the thing until the motor showed any symptoms. That car ran 5 or 6 years without issues and he sold it as it was to another friend. That guy continued to run that motor until he did something very stupid and took out a light pole.
Similar threads
