Oil pressure situation!!
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Oil pressure situation!!

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    Senior Member LicktySplitJr's Avatar
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    Default Oil pressure situation!!

    So I dont know if I should post this in Dyno section or here....but im choosing here because it seems to get more traffic.

    So here goes, I have an oil pressure problem. Im running a little 461 bb chevy with a standard volume melling oil pump and a dooley 10 quart. When cruising im only running about 45lbs of pressure at 3000 rpm's. When I stand on it almost instantly I lose oil pressure until I let up. It drops to around 5lbs maybe less if I decided to keep my foot in it. I just pulled the motor, pulled the pan checked clearance to p/u and all is well. Nothing is blocking the p/u......basically nothing I can see. Im running 20w50. Ive tried three different weights before pulling the motor so thats not it.........The only conclusion i can come to is the pump......Any suggestions as to what I should do? Im thinking of spending the money on a nice high volume....What to do?????????? Suggestions please, yuma next weekend is coming quick!! PLEASE HELP

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    Boat Nut sleekcrafter's Avatar
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    do you have enough clearance on the pick up, to the bottom of the pan? should be about a 1/4 inch space, less than that can cause the pump to cavitate. oops missed the fact you checked that, are you running a remote filter? any chance the lines are mixed up?

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    Quote Originally Posted by LicktySplitJr View Post
    I just pulled the motor, pulled the pan checked clearance to p/u and all is well. Nothing is blocking the p/u......basically nothing I can see.

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    Senior Member Boat 405's Avatar
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    How many quarts of oil are you putting it the motor?

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    Senior Member LicktySplitJr's Avatar
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    I have about 3/8 of an inch of clearance from the p/u to the bottom of the pan. No remote oil filter directly on the block and I have 9quarts in the pan 1 in the filter.

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    Quote Originally Posted by LicktySplitJr View Post
    I have about 3/8 of an inch of clearance from the p/u to the bottom of the pan. No remote oil filter directly on the block and I have 9quarts in the pan 1 in the filter.
    pull out 2 quarts. 9 is too much

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    Quote Originally Posted by widowmaker View Post
    pull out 2 quarts. 9 is too much
    Now im going to play dumb and ask, why would this cause a loss? Im trying to remember but I think I tried this.....maybe.....im just frustrated at this point and cant think. Spent my whole summer getting this thing on the water and everything went as planned except this

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    Quote Originally Posted by LicktySplitJr View Post
    Now im going to play dumb and ask, why would this cause a loss? Im trying to remember but I think I tried this.....maybe.....im just frustrated at this point and cant think. Spent my whole summer getting this thing on the water and everything went as planned except this
    Oil hitting the crank causing windage foaming the oil. Most 10 quart pans only work with around 7 quarts. I had the same problem in two different 10quart pans. When you accelerate there is too much oil in the back of the motor and it gets ugly, as you can see by the oil pressure. 7 quarts in the pan is plenty. I even had this problem on the dyno we ended up with 6.5 quarts in a static situation. You could probably get away with 6 when it is in the boat.

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    Quote Originally Posted by widowmaker View Post
    Oil hitting the crank causing windage foaming the oil. Most 10 quart pans only work with around 7 quarts. I had the same problem in two different 10quart pans. When you accelerate there is too much oil in the back of the motor and it gets ugly, as you can see by the oil pressure. 7 quarts in the pan is plenty. I even had this problem on the dyno we ended up with 6.5 quarts in a static situation. You could probably get away with 6 when it is in the boat.
    I have seen this happen before as well and it could likely be your problem. I run 7 quarts total in a 10 quart pan.

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    Senior Member LicktySplitJr's Avatar
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    What about the cruising oil pressure, that doesnt seem low? So I have also heard of clearancing a pump to increase oil pressure a little?......Would it be wise to buy a new pump along with trying the less oil to try an avoid pulling this thing back out? The bad part is I wont be able to test before yuma...long ways to drive to still have an issue....

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    I run a mellings HV77 pump and they have always worked well for me. They are cheap and if you have the time I would do it. along with dropping the oil level

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    I'm No Expert Shaun's Avatar
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    are you running a electric oil pressure guage or a mechanical? If electric, go buy a cheapy mech one and see what it says.

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    Senior Member LicktySplitJr's Avatar
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    Quote Originally Posted by widowmaker View Post
    I run a mellings HV77 pump and they have always worked well for me. They are cheap and if you have the time I would do it. along with dropping the oil level
    I believe thats the high volume? Mine isnt.....No time like the present to put another one in and it is a lot cheaper than what the other option could be

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    Quote Originally Posted by LicktySplitJr View Post
    So I dont know if I should post this in Dyno section or here....but im choosing here because it seems to get more traffic.

    So here goes, I have an oil pressure problem. Im running a little 461 bb chevy with a standard volume melling oil pump and a dooley 10 quart. When cruising im only running about 45lbs of pressure at 3000 rpm's. When I stand on it almost instantly I lose oil pressure until I let up. It drops to around 5lbs maybe less if I decided to keep my foot in it. I just pulled the motor, pulled the pan checked clearance to p/u and all is well. Nothing is blocking the p/u......basically nothing I can see. Im running 20w50. Ive tried three different weights before pulling the motor so thats not it.........The only conclusion i can come to is the pump......Any suggestions as to what I should do? Im thinking of spending the money on a nice high volume....What to do?????????? Suggestions please, yuma next weekend is coming quick!! PLEASE HELP
    This has been discussed a few times in the past, try doing a search. I remember something about the oil filter adapter can cause the problem you describe, a bypass not installed correctly or the indexing of the adapter to the block. Before you pull the engine pull the filter and remove and inspect or just change the adapter. Chevy guys will know more about this than I do as I'm a Ford guy.

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