Oil pressure problem... need advice
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Oil pressure problem... need advice

  1. #1
    Speed is a function of $$ mightylandwalrus's Avatar
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    Default Oil pressure problem... need advice

    Saw a post on this a while back but I think I am looking at a little different scenario. I have a 468 BBC and I run Valvoline straight (4 quarts) 50 Wt. with a bottle of Lucus Oil Stabalizer. I believe the oil pan is a 5-6 quart oil pan. I change the oil every three times I go out to the lake after it gets fairly black.

    Problem: Fresh oil and first trip to the lake I am running around 80 lbs. of pressure. As the day progresses I notice that the pressure starts to drop to around 60 lbs. (Possibly to the thinning of the oil) Second trip I am running around 60 to 70 lbs of pressure but after a hard run say about 3-5 min at 5600 RPM I notice it has dropped to about 30 to 35 lbs of pressure. It never falls below this or hits zero like the last post related to this issue. It just gets really low especially when I let off the gas. I assume thats from the oil rushing to the front of the oil pan?

    Solutions: ??? Possibly a bigger oil pan? Different type of oil?

    All responses are appreciated. Thanks to all who respond
    Beer is the answer... but I dont remember the question.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    most stock bbc pans hold 7qts

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    Senior Member UNASHAMED's Avatar
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    Oil temp, excessive gas in the oil can be an issue.
    "Don't make me get my penguin"

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    Cas
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    Quote Originally Posted by mightylandwalrus View Post

    Solutions: ??? Possibly a bigger oil pan? Different type of oil?

    All responses are appreciated. Thanks to all who respond
    it could be that it has too much oil in it and the crank is aerating the oil.
    I'd take the filter off and cut it open to check for any kind of glitter. If you find glitter, you very well may have a bearing issue.

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    Inland Empire-Big River
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    I had similiar issues with my BBC.

    Is it a mechanical gauge?

    What brand pan is on it? Mine's a Milodon 10qt., I only put 8 qts and it helped. Milodon's seem to be troublesome and not my first choice.

    As Cas said you could be aerating the oil. There's so many variations and your answer is going to lie in the details.

    Be sure what pan/size you have, style of pickup, accurate gauge, etc...

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    Senior Member Fonz69's Avatar
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    If you are going to run it at 5600 for long periods of time a 10q pan is a must!

    Get a pan and a good oil pump and you will be happy

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by mightylandwalrus View Post
    Saw a post on this a while back but I think I am looking at a little different scenario. I have a 468 BBC and I run Valvoline straight (4 quarts) 50 Wt. with a bottle of Lucus Oil Stabalizer. I believe the oil pan is a 5-6 quart oil pan.
    straight 50 plus a bottle of Lucas Oil Stabilizer...damn > that's a thick blend!
    And probably bypassing(unfiltering it) most of the time.
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    Quote Originally Posted by HammerDown View Post
    straight 50 plus a bottle of Lucas Oil Stabilizer...damn > that's a thick blend!
    And probably bypassing(unfiltering it) most of the time.
    Not if the bypass is blocked off!

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by PS&B1 View Post
    Not if the bypass is blocked off!
    True but, do you really feel when 'cold' it's pumping to the vital small orifice parts of the engine?
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    Quote Originally Posted by HammerDown View Post
    True but, do you really feel when 'cold' it's pumping to the vital small orifice parts of the engine?
    My engine is never cold, Being that I warm it up for a couple a min. Before I hit the main part of the river. I don't take off until my water temp is 150-180 so by then my oil is usually 160* but at 60-80 lbs pressure Yeah you bet. Besides I count on the fact because it's so thick it stays in the little orfices!lol Put it this way. If you are painting a wall in your house what covers better THICK paint or thin paint. Same laws apply.

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by PS&B1 View Post
    My engine is never cold, Being that I warm it up for a couple a min. Before I hit the main part of the river. I don't take off until my water temp is 150-180 so by then my oil is usually 160* but at 60-80 lbs pressure Yeah you bet. Besides I count on the fact because it's so thick it stays in the little orfices!lol Put it this way. If you are painting a wall in your house what covers better THICK paint or thin paint. Same laws apply.
    Trust me, for years you would be preaching to the quire with the usage of straight 50wt >That's all I ever used. I agree about how the thicker oil coated moving parts better > when I did my own test I saw it first hand > with 20/50 the rockers/springs etc appeared dry when the engine sat for a week. Same test with the old ORIGINAL Kendall 50/wt and everything was coated.
    However, I've NEVER saw a oil cling/stick to parts like the old Kendall > even trying to wipe it off your fingers was a PITA!
    First time (and I can't believe it) I tried Valvoline VR1 Synthetic Racing 20/50...the stuff holds HOT pressure ie doesn't sheer down, takes sometime to build temp and > wouldn't run as hot in the same engine. I attribute this to, removing heat from parts better (maybe due to better flow) AND maybe, just maybe causing less friction in the engine.
    Trust me > I still have a full case of Brad Penn (old Kendall) at the ready (if) the I lose the warm/fuzzy feeling from the synthetic 20/50.
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    After warm, mine would drop off to 25 lbs right at 4000 RPM, but it would come back up below that (except warm at idle, it would be down to normal psi)...does yrs come back up? If so it could be a couple issues such as the oil moving away from the pickup, or pumping it all up top (windage can hold the oil up there too) If it is not coming back, then it could be aerating the oil (over filled?)

    Long story short, a Steph's custom pan solved my problems...

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    Some things i am pretty sure of...feel free to correct if i am wrong..

    BBC...always a 7qt pan from the factory.
    Running 4 qts in a BBC is way scary. Stock olds motor will need about 7 to keep the pickup covered @4500 and less than 2 minuets

    Aerating should be rather obvious when the lifters bleed down..at least that is what my olds does. 10 qts in an 8qt pan..even with pan mounted windage tray


    I was told by a General Motors engineer that the chemicals added to create multi grade oil have no/limited lubrication properties.....

    I bet i can tell the difference between val 20/50 and straight val 50wt with a few drops between my fingers

    For enough fuel contamination in oil to cause a problem with pressure it will be very obvious from the smell of the oil. and unless the the fuel has actually cleaned something, the color of the oil should not change.

    The Op stated a reduction of oil pressure after a hard run...with only 4 qts. the oil will heat much faster and should begin to return to normal
    after a few minutes if idling...my olds will pick up 10lbs of pressure after 10 min of idling in gear.

    Dash mounted mechanical oil pressure gauges seem 'lazy' to me...slow to respond..and i have tried 3 different gauges..all using the 1/8 od plastic line...and yes, all the air has been bled out..several times.

    I was told by someone around here that many people do not use the the normal oil filter adapter with the filter bypass...relying only on oil that is pumped through the filter for engine oil pressure?

    And i was also told that while i will usually pre-lube a motor with an old dizzy with the cam drive gear ground off on a 'new'motor.. i will always without fail, spin the motor over with the starter motor with the plugs removed until full oil pressure is achieved....

    by doing that i am actually damaging the motor...and that it actually is better if the motor starts instantly on initial start up.??

    thanx
    mike
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  16. #14
    Speed is a function of $$ mightylandwalrus's Avatar
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    Thanks all! I appreciate all the info. Think I'm going to start out with a bigger pan (10 quart) to see if that resolves the issue. If that doesnt work I'm sure I'll be hitting yall up again. Thanks
    Beer is the answer... but I dont remember the question.

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