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Losing Oil Pressure upon luanch, problem fixed HOW
#343406
06/10/09 05:53 PM
06/10/09 05:53 PM
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Joined: Mar 2008
Posts: 724
PA USA
flatiron
OP
super stock
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OP
super stock
Joined: Mar 2008
Posts: 724
PA USA
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I have a 431 and while Driving at 2500 rpm my oil pressure holds at 62lbs. When I luanch from a red light it drops to 0 Then comes back up after 20 seconds or so. I have a aftermarket gauge and I noticed some air bubbles in the line could it be this or should I be looking at something else?
Last edited by flatiron; 06/12/09 10:52 PM.
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343407
06/10/09 05:55 PM
06/10/09 05:55 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Do you have baffles in the oil pan and a windage tray?? How far off the floor of the pan is your sump and do you have a deep oan??
Clean it, if it's Dirty. Oil it, if it Squeaks.
But: Don't fix it, if it Works!
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343410
06/10/09 06:15 PM
06/10/09 06:15 PM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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I agree with the other posts, you are uncovering the pick up screen.Baffles and a tray are mandatory.One more item to check is the pick up tube itself. It must be tight (and sealed) in the block and without any cracks.A few of those uncoverings could be very costly.Needs to be repaired asap.
Leave the gun.......take the Cannoli's....Mike
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Re: Losing Oil Pressure upon luanch
[Re: mike s]
#343414
06/10/09 06:48 PM
06/10/09 06:48 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Quote:
A tray ? ...is way WAY toooo high to control oil movement. It was designed for and is only good to get the oil AWAY from the rotating assembly.
You need baffles and "doors" to keep the oil in the area of the PU tube opening.
Windage not movement.Normal street pan can not keep the oil far enough away from the crank.Windage can add to the problem.
I am not following what you are saying.
I would AGREE that windage is an issue ... but not HERE ... with the OP's problem.
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Re: Losing Oil Pressure upon luanch
[Re: dOc !]
#343416
06/10/09 07:22 PM
06/10/09 07:22 PM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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I addressed the problem.These issues shouldn't be a problem.Everything I mentioned should be a part of any performance build.I was speaking in the builds' totality. Moroso and Milodon (and others)have nice 7 inch deep pans that fits early and late chassis.At the least any serious perfromance build should have a Street Hemi pan (6qts)if you are going to hammer the combo IMO. Stop yelling  if someone would have informed the writer during the build he would not have the problem he does IMO 
Leave the gun.......take the Cannoli's....Mike
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343417
06/10/09 07:25 PM
06/10/09 07:25 PM
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Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
mike s
top fuel
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top fuel
Joined: Jan 2007
Posts: 1,668
Mi,U.S.A.
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Yes,a bit of work but not too bad. Easier if you drop the centerlink and lift the engine slightly.
There are no stupid questions on Moparts. We all can learn something here.
Last edited by mike s; 06/10/09 07:26 PM.
Leave the gun.......take the Cannoli's....Mike
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343420
06/10/09 08:17 PM
06/10/09 08:17 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
I have a 431 and while Driving at 2500 rpm my oil pressure holds at 62lbs. When I luanch from a red light it drops to 0 Then comes back up after 20 seconds or so.
Your first priority should be getting a good HP oil pan.
And when you R&R the old pan ... I would check a couple of bearings. Letting a motor run(especially under WOT) and having to wait for the oil-pressure to come-back to normal COULD NOT have done the bearings any good.
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343426
06/11/09 09:34 AM
06/11/09 09:34 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
OK looking at the 440 source website and I see a #402 or a deep sump pan #121-1030 which one would be a good choice or should I look at a different manufacture? I'm a little worried about clearence on the street with a deep sump.
What is your EXACT engine/car combo? OEM engine mounts ? .... this will determine what pan you will need.
A deep sump ...on the street ...R U worried about crashing the sump? ..... a skid-plate on the Kmember is in order.
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Re: Losing Oil Pressure upon luanch
[Re: kwikblownhemi]
#343430
06/11/09 10:45 AM
06/11/09 10:45 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Even with only three quarts actually in the sump, it should be impossible for your car to uncover the pickup on initial launch -if everything is as it should be.
An improperly located pickup or even the slightest crack in the tube could cause an instant loss of pressure.
Huh ? .... hot oil in-the-sump is almost like water ! and if you launch the car with an oil-pan that has no baffling with THREE QUARTS of oil in-the-sump you WILL have oil pressure issues.
A crack in the pickup tube ....will affect ONLY during a launch ? ..... Huh ?? It will suck-air(depending on where the crack is) and effect oil-pressure all-the-time !
And to all that think baffling is not important ... LOOK at what the OEM put on any HP car. Most had front and rear baffling.
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Re: Losing Oil Pressure upon luanch
[Re: dOc !]
#343434
06/11/09 11:13 AM
06/11/09 11:13 AM
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Joined: Feb 2005
Posts: 143
North America
kwikblownhemi
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member
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North America
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Quote:
Quote:
Even with only three quarts actually in the sump, it should be impossible for your car to uncover the pickup on initial launch -if everything is as it should be.
An improperly located pickup or even the slightest crack in the tube could cause an instant loss of pressure.
Huh ? .... hot oil in-the-sump is almost like water ! and if you launch the car with an oil-pan that has no baffling with THREE QUARTS of oil in-the-sump you WILL have oil pressure issues.
A crack in the pickup tube ....will affect ONLY during a launch ? ..... Huh ?? It will suck-air(depending on where the crack is) and effect oil-pressure all-the-time !
And to all that think baffling is not important ... LOOK at what the OEM put on any HP car. Most had front and rear baffling.
"Depending on where the crack is"
You said it.
No one said baffling isn't important.
Good luck with your problem, flatiron.
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Re: Losing Oil Pressure upon luanch
[Re: kwikblownhemi]
#343435
06/11/09 11:25 AM
06/11/09 11:25 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
"Depending on where the crack is"
You said it.
And you left-out .... it will affect OP all the time.
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343437
06/11/09 11:27 AM
06/11/09 11:27 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Hey Doc
Look at 440's website the pan I'm looking at is Part#121-1030 with pick up part# 1271-017. I have to wait till later to call them but it seems like a direct bolt up.
LOOKS good to me.
But I would like to see the baffling and how well it is sealed to the side of the pan.
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343439
06/11/09 11:45 AM
06/11/09 11:45 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
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Florida STAYcation
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Quote:
Man I have to get to bed gotta get up at 2:30 for my kids. Mopars and 3rd shift don't mix. Think I might go the whole route windage tray, pick-up and deep pan
Good choices ... but DON'T forget that skid-plate !
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Re: Losing Oil Pressure upon luanch
[Re: dOc !]
#343440
06/11/09 11:49 AM
06/11/09 11:49 AM
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Joined: Feb 2005
Posts: 143
North America
kwikblownhemi
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member
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North America
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Quote:
And you left-out .... it will affect OP all the time.
I left out nothing. A crack that is submerged most of the time would only affect oil pressure when/if it is uncovered. But you know that.
Just so you understand my take on Flat's problem:
I frequently deal with people who have thrown money at their problems until in frustration they have someone look for the cause. For all we know, Flat's pickup may be 1" off the bottom of the pan. A new, baffled pan and accompanying pickup that ends up where it belongs would fix his problem, no doubt. Hence my previous statement, "If everything is as it should be."
It is easy to get on an Internet forum and spend someone else's money. I prefer to know what is causing a problem before spending my customer's money to solve it. That's all.
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Re: Losing Oil Pressure upon luanch
[Re: kwikblownhemi]
#343441
06/11/09 11:58 AM
06/11/09 11:58 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOc !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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...and where do most cracks happen ? ... from what I have heard and seen ... up where it is screws into the block. Now for that area to be submerged in oil .....  .. there would have to be well MORE than 3 quarts of oil in-the-sump.
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Re: Losing Oil Pressure upon luanch
[Re: dOc !]
#343443
06/11/09 12:11 PM
06/11/09 12:11 PM
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Joined: Feb 2005
Posts: 143
North America
kwikblownhemi
member
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member
Joined: Feb 2005
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North America
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Quote:
...and where do most cracks happen ? ... from what I have heard and seen ... up where it is screws into the block.
Now for that area to be submerged in oil ..... .. there would have to be well MORE than 3 quarts of oil in-the-sump.
It is apparent that having the last word is critical. And you shall. Goodbye.
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343444
06/11/09 06:53 PM
06/11/09 06:53 PM
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Joined: Mar 2008
Posts: 724
PA USA
flatiron
OP
super stock
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OP
super stock
Joined: Mar 2008
Posts: 724
PA USA
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Quote:
Ok fella's I greatly appreciate everyone's input and it does seem like I toss money I don't need to nor have to toss around. So I'm gonna back up a few steps. Slow down and trouble shoot this drain my oil, Measure it heck with the dipstick add a quart for one run and see what that does. I have to ask a question that might seem dumb to some and remember I'm new to this. Looking at a picture of a pick up it is threaded so if it's tight how could it be out of location? Now I need a promise from my Mopar buddies on here No answer's for about a hour I really got to get to bed and I can't get away from this computer. DARN 2.5 HRS TO SLEEP NO WONDER I LOOK LIKE CRAP. Goodnight
Any answer on my pickup question?
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343445
06/11/09 07:11 PM
06/11/09 07:11 PM
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Joined: Jul 2003
Posts: 6,342
SE PA.
QuickBpBp
master
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master
Joined: Jul 2003
Posts: 6,342
SE PA.
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Quote:
Quote:
Ok fella's I greatly appreciate everyone's input and it does seem like I toss money I don't need to nor have to toss around. So I'm gonna back up a few steps. Slow down and trouble shoot this drain my oil, Measure it heck with the dipstick add a quart for one run and see what that does. I have to ask a question that might seem dumb to some and remember I'm new to this. Looking at a picture of a pick up it is threaded so if it's tight how could it be out of location? Now I need a promise from my Mopar buddies on here No answer's for about a hour I really got to get to bed and I can't get away from this computer. DARN 2.5 HRS TO SLEEP NO WONDER I LOOK LIKE CRAP. Goodnight
Any answer on my pickup question?
It can be tight and be crooked it needs to be parallel to the bottom of the pan/block. I had this same problem with my 64 Dodge when I first started racing,it 60ftd in the low 1.60's and it would lose oil pressure and swing right back-up..It was an old gauge I changed it with a better liquid filled gauge and the same thing. kinda what I thought but wanted to make sure anyway. So off came the pan and welded in some baffles and it NEVER did it again...I think it's the pan buy one and never look back. Also if you don't have a windage tray get one and put it in while the pan is off....
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Re: Losing Oil Pressure upon luanch
[Re: flatiron]
#343449
06/13/09 12:30 AM
06/13/09 12:30 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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any idea how it ended up w that much clearance?
live every 24 hour block of time like it's your last day on earth
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20 seconds is a long time with no oil pressure. A windage tray is not a baffle, but it will help control slosh if you are running a pan with no baffles. Drain the oil and measure just how much you are running ( forget what the dip stick sez ). Try running an addition quart and see if the problem goes away ( don't concern yourself with foaming at this point in time ). Check the drain-back holes in the block valley area. A few more no oil pressure for 20 second passes and you will be pulling the motor for other reasons.
