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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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flatiron Offline OP
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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.
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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MoparforLife Offline
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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!
Re: Losing Oil Pressure upon luanch [Re: MoparforLife] #343408
06/10/09 06:05 PM
06/10/09 06:05 PM
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dIc dOc Deity ! Offline
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Roger that ..... do you have proper baffles in that pan ?

I can not believe how many pans are being sold that have NO WAY any type of "proper" baffling. And some that DO have baffles .. they are not sealed at all.

Re: Losing Oil Pressure upon luanch [Re: flatiron] #343409
06/10/09 06:07 PM
06/10/09 06:07 PM
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Santa Cruz, California
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Lefty Offline
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I had a similar problem once on the road to my house. I figured out I was loosing traction over some stutter bumps and spinning the wheels in the air. Sucked the pan dry quick. Real scary seeing the oil pressure go to nothing. I have a windage tray to go in, but I suspect i'm going to need to carry more oil also.

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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mike s Offline
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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
Re: Losing Oil Pressure upon luanch [Re: mike s] #343411
06/10/09 06:18 PM
06/10/09 06:18 PM
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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.

Re: Losing Oil Pressure upon luanch [Re: dIc dOc Deity !] #343412
06/10/09 06:35 PM
06/10/09 06:35 PM
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flatiron Offline OP
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Any recomendations on a good pan for a 67 Coronet 440 with a 383 stroked to a 431. Hoping to make it to a strip someday but mostly ran on the street.

Re: Losing Oil Pressure upon luanch [Re: dIc dOc Deity !] #343413
06/10/09 06:42 PM
06/10/09 06:42 PM
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mike s Offline
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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.


Leave the gun.......take the Cannoli's....Mike
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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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.

Re: Losing Oil Pressure upon luanch [Re: dIc dOc Deity !] #343415
06/10/09 07:12 PM
06/10/09 07:12 PM
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flatiron Offline OP
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Might seem like a stupid question but can I change pans with motor still in the car?

Re: Losing Oil Pressure upon luanch [Re: dIc dOc Deity !] #343416
06/10/09 07:22 PM
06/10/09 07:22 PM
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mike s Offline
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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
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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mike s Offline
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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
Re: Losing Oil Pressure upon luanch [Re: mike s] #343418
06/10/09 07:32 PM
06/10/09 07:32 PM
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flatiron Offline OP
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Thanks to all I gotta get out the door and go make more money to support my Mopar habit. Dang will I ever get to take this thing down a dragstrip?
I'll continue this post tomarrow. I'm looking at 440 source Pans and pick up's (good choice)? Also if I'm changing the pan would there be any reason why I shouldn't add a windage tray?
THANKS TO ALL FOR THE INPUT

Re: Losing Oil Pressure upon luanch [Re: flatiron] #343419
06/10/09 07:44 PM
06/10/09 07:44 PM
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Columbus, Ohio
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I had this problem shortly after installing my new MP short block, ended up putting a high volume pump with stock pan. 360ci. during hard acceleration oil pressure would drop out and come back when back at reasonable acceleration. Oil was not returning to the pan fast enough. Was okay if I ran an extra half quart of oil or so. I know it is not rec'd but it would be easy to check. Add an additional quart of oil and see if problem goes away. If so you too have an oil return problem and are uncovering the pickup.

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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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.

Re: Losing Oil Pressure upon luanch [Re: flatiron] #343421
06/10/09 10:31 PM
06/10/09 10:31 PM
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A street car on street tires? Zero oil pressure for 20 seconds after "launching" from a stop light is indicative of greater problems than just absent pan baffles....

Re: Losing Oil Pressure upon luanch [Re: kwikblownhemi] #343422
06/11/09 08:58 AM
06/11/09 08:58 AM
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flatiron Offline OP
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looking into installing a Melling M-63HV oil pump. Is this much of a job can it be done while in the car.

Re: Losing Oil Pressure upon luanch [Re: flatiron] #343423
06/11/09 09:08 AM
06/11/09 09:08 AM
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A HV/HP pump will make the prob WORSE.

Spend your money and time getting the proper oil pan on that car.

Re: Losing Oil Pressure upon luanch [Re: dIc dOc Deity !] #343424
06/11/09 09:20 AM
06/11/09 09:20 AM
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flatiron Offline OP
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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.

Re: Losing Oil Pressure upon luanch [Re: kwikblownhemi] #343425
06/11/09 09:25 AM
06/11/09 09:25 AM
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Quote:

A street car on street tires? Zero oil pressure for 20 seconds after "launching" from a stop light is indicative of greater problems than just absent pan baffles....


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.


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