oil pressure drop ?
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oil pressure drop ?

  1. #1
    Senior Member CK7684's Avatar
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    Default oil pressure drop ?

    My oil pressure is dropping right at 4000 rpm. What might cause this? It is going from 60 down to about 25-30 Also checked with mech gauge...

    It's a BBC 468, melling oil pump and milodon 10qt jetboat pan, 20-50 Kendall oil

    When the R's go below 4000 the oil pressure comes back. It drops back to about 30 at idle when it warmed up. Anything over idle and it's back at 55-60 until I hit 4000 rpm. Even gradually increasing, so I dont thin k it's from sloshing. I have tried running the full 10 quarts down to about 7 qts with no changes in this condition...

    Any ideas??

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    Pull the pan and check for a cracked pickup.
    Chris Straub
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    Senior Member CK7684's Avatar
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    Thanks. While we are on the subject, what is a good pan for a budget? I've heard of a few good pans while reading the forum, but they all seem to be $1000 or more...my budget is pretty well dried up at the moment...

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    Sit N' Spin Jetaholic's Avatar
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    I've been running Canton's 9qt marine pan and have had no oil pressure issues. Comes with a windage tray and double trap doors. I think they're around $300-$400.



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    Senior Member Futs's Avatar
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    B&B pan is a really nice pan for the money. It's basiclly a steel stephs pan.

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    gn7
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    While you have the pan off check the pick up, check the distance off the bottom. Try for 3/8" but no more! 5/16" is better than 7/16. The bfurther it is off the bottom, the harder it is to maintain pressure at Rs. For some reason, 4000 seems to be the magic number for this to happen. And make sure it is FLAT AND PARALEL to the bottom.



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    Quote Originally Posted by CK7684 View Post
    Thanks. While we are on the subject, what is a good pan for a budget? I've heard of a few good pans while reading the forum, but they all seem to be $1000 or more...my budget is pretty well dried up at the moment...
    Check with REX marine on our B&B Pan. Mike stocks them on the "Left Coast" an they have become very popular with the Jet crowd....

    10 Qt pan including filter
    Removeable Windage tray and crank scraper
    8" Depth
    Acceleration ledge to keep oil from climbing up the back of the pan
    Comes with matching pick up and 12 bolt kit for easy installation
    Uses OEM GM dipstick
    Will clear up to 4.250" Stroke
    Chris Straub
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    Senior Member CK7684's Avatar
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    Thanks for the input. Things were all running fine for most of last season (engine being fresh as well) If I end up pulling the engine out, I may just switch pans at the same time...

    Naturally, I start hearing bad things about the Milodon pan after I had everything together, but it did seem to be working fine for awhile...

  11. #9
    I'm No Expert Shaun's Avatar
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    The B&B pan wants you to weld the pickup onto your pump. If your current pickup is welded to your pump and you plan on getting a new pump the guys at stefs have a pump with the pickups already welded on for purchase. Just FYI.

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    Senior Member CK7684's Avatar
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    Thanks. I believe mine is welded on...

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    Senior Member CK7684's Avatar
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    Got the engine pulled and everything looked good underneath. No issues with the pump or the pickup at all. I am wondering what the main differences are between the Milodon pan and the B&B pan. Does the B&B pan have a kickout?

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    Senior Member Bubbletop409's Avatar
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    You may have too much oil "trapped" in the valve covers and valley and after a while at speed you are running the pan low.

    Valley screens, Jesel drive, certain heads can all cause restrictions in the oils ability to return quickly to the pan.

    Many BBC run external oil return lines from the corner of the heads to the pan.
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    You could be collapsing the oil filter. What are you using

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    We welded Chevy oil pickups since the 396 appeared on the scene 1969, That was a given one of the first thing a Chevy builder did.

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