How much oil stays in the oil pan ?
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How much oil stays in the oil pan ?

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    Resident Ford Nut Sleeper CP's Avatar
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    Default How much oil stays in the oil pan ?

    With a 10 or 12 qrt pan does anyone have a guess as to how much oil stays in the pan after running 1/4 mile over 6,000 r's ?


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    Distinguished Member David 519's Avatar
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    This might be an interesting thread. I don't know the answer, but I bet there's a bunch of variables that make a hard and fast answer difficult/impossible. How good the block drain back is, how long it takes to run the quarter, how good the pump is, etc. Pretty much any pan I've ever run has had good oil pressure for the whole pass, suggesting enough oil over the pick up.
    My flats have all had issues on shut down though. Now we run an accusump and it's solved the oil pressure on shut down issues.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

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    what is the volume of all the oil passages, oil pump cavity, etc?

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    With a 10 or 12 qrt pan does anyone have a guess as to how much oil stays in the pan after running 1/4 mile over 6,000 r's ?


    S CP
    There should be about 6 1/2 7 still in the pan. Are you running oil restrictors?
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    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by 71hallett View Post
    There should be about 6 1/2 7 still in the pan. Are you running oil restrictors?
    So you're saying some 3 qts are in the heads, block oil passages, other parts and clinging to things as it's making it's way back down south?
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    Cantard 71hallett's Avatar
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    Quote Originally Posted by HammerDown View Post
    So you're saying some 3 qts are in the heads, block oil passages, other parts and clinging to things as it's making it's way back down south?
    I would say a quart+ is wraped around the crank alone.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    I agree with David519 and Hallet, both...there are tons of variables for one answer to be right, but you can bet at least three quarts are in transit. My guess is more. Also, the question might be how much is enough in the pan whlie running? Drag application vs. endurance. We know the lower the oil level the better for windage control, but we also like to get oil back in the pan to get it cooling as soon as possible. When is more oil in the sump better?
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    Quote Originally Posted by David 519 View Post
    This might be an interesting thread. I don't know the answer, but I bet there's a bunch of variables that make a hard and fast answer difficult/impossible. How good the block drain back is, how long it takes to run the quarter, how good the pump is, etc. Pretty much any pan I've ever run has had good oil pressure for the whole pass, suggesting enough oil over the pick up.
    My flats have all had issues on shut down though. Now we run an accusump and it's solved the oil pressure on shut down issues.
    david are you guys jus plumbed into the oil gallery with the accusump with the valve open? jus curious, seems like a nice easy way to ensure pressure never dives too low plus you can preoil before cranking.turbos like to keep spinnin after the motor is off, seems like a nice way to maintain oil pressure on the turbo instead of it coming to a stop with no oil pressure

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    Quote Originally Posted by David 519 View Post
    This might be an interesting thread. I don't know the answer, but I bet there's a bunch of variables that make a hard and fast answer difficult/impossible. How good the block drain back is, how long it takes to run the quarter, how good the pump is, etc. Pretty much any pan I've ever run has had good oil pressure for the whole pass, suggesting enough oil over the pick up.
    My flats have all had issues on shut down tho ugh. Now we run an accusump and it's solved the oil pressure on shut down issues.
    How about oil temp.....probably the most important variable....the difference between 90* oil and 150* is about half an hour on an oil change if i just let it run out the drain hose 10-15 min hot and 40+ cold.....
    As far as oil stuck in the valve cover on a BBO.....with no oil restricters and the drain backs DRILLED and polished.....i took a junk valve cover and sunk a 3/4 pipe fitting in it as close to the head as i could get it....made a nut for the inside to make it seal....hose clamped a 7/8 piece of clear vinyl hose and hooked it into my oil drain hose.....i ran it 4-4500 for maybe 4 minuets with the oil up to temp...had to keep lookin over my shoulder to keep an eye on it...but the only time i saw any kind of oil in it was turning and that valve cover was on the outside of the turn....and even that might have gotten pushed up from the oil pan.

    A sorta good check to see how much oil is in the upper part of the motor is wait for the motor to get cold with some 50Wt in it check oil level, fire it up for 30 seconds at 2k rpm..shut it off and check the level again...
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    Lunati did a test on this many years ago. It was good tech info in the catalog but they took it out after a few publishings. I will try to find it.
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    Senior Member stix818's Avatar
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    I know my dry sump really isn't comparable to what you guys are looking for BUT during a run there's anywhere from 4 to 5 quarts in the sump with 8 quarts in the motor initially.. No restrictors and the lifter valley is open..
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    Quote Originally Posted by 71hallett View Post
    i would say a quart+ is wraped around the crank alone.
    Quote Originally Posted by sleeper cp View Post
    with a 10 or 12 qrt pan does anyone have a guess as to how much oil stays in the pan after running 1/4 mile over 6,000 r's ?


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    Distinguished Member David 519's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    david are you guys jus plumbed into the oil gallery with the accusump with the valve open? jus curious, seems like a nice easy way to ensure pressure never dives too low plus you can preoil before cranking.turbos like to keep spinnin after the motor is off, seems like a nice way to maintain oil pressure on the turbo instead of it coming to a stop with no oil pressure
    With a Dart block, we go into the big plug above the oil filter. For the most part, we leave the valve open and it fills in a couple seconds after the engine starts. At the end of the day, if we're not gonna change the oil, we'll start the motor and let it fill, then close the valve to pre-oil the next day. To be honest, the pre-oiling feature is not a big deal to me. It's mostly about maintaining oil pressure during a run/shut down.

    Quote Originally Posted by Sold honda.bought hondo View Post
    How about oil temp.....probably the most important variable.......
    We try to never run the motor WFO until the oil is at least 140+.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    gn7
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    Jenkins did some test on a small block back in the Vega days, and had his small blocks down to 1/2 qt missing from the reservoir tank at 9000 Rs. It couldn't been much worse before he started making mods, because he only used a 5 qt reservoir.

    Bet Warp Speed knows down to the teaspoon in one of his deals.



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    Last edited by gn7; 10-06-2010 at 11:38 AM.

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