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Old 12-05-2020, 02:28 PM   #1 (permalink)
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Old 12-05-2020, 05:20 PM   #2 (permalink)
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Originally Posted by DrBacon View Post
So this is a discussion I've had with a friend and we aren't really sure about, figured I'd ask here since you're all super knowledgeable people. But we're thinking THEORETICALLY, if you had an oil cooler and an oil fed turbo or supercharger, wouldn't it be smart to SLIGHTLY overfill your oil beyond the max line. The theory is that when the car sits the oil in the lines will drain back in the pan and give a higher than it actually is reading, when you go to start the car the oil is sucked in the lines and turbo/supercharger and now you're effectively low on oil. Does this sound insane or actually plausible?
For an oil cooler, it depends on how the lines run and how the cooler is positioned. Some people have mounted the cooler 'upside down', with the fittings facing the street. In that case, when the car is off the oil will travel from the cooler to the pan and actually give you a higher oil level reading than actual.



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Old 12-05-2020, 07:10 PM   #3 (permalink)
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Originally Posted by DrBacon View Post
So this is a discussion I've had with a friend and we aren't really sure about, figured I'd ask here since you're all super knowledgeable people. But we're thinking THEORETICALLY, if you had an oil cooler and an oil fed turbo or supercharger, wouldn't it be smart to SLIGHTLY overfill your oil beyond the max line. The theory is that when the car sits the oil in the lines will drain back in the pan and give a higher than it actually is reading, when you go to start the car the oil is sucked in the lines and turbo/supercharger and now you're effectively low on oil. Does this sound insane or actually plausible?
Meh, why overthink it? AFAIK, no ones ever lost a motor due to low oil in the above scenario, just check the level regularly and it’ll be fine. Also, too much oil is worse than too little (obviously very low on oil is very bad) but I’d rather be slightly low vs slightly too high personally.
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Old 12-05-2020, 07:25 PM   #4 (permalink)
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That doesn't happen. The oil stays in the lines and dose not drain back to the oil pan. I have had a many a turbo car with oil coolers. I do fill up to just below the full line. When the car is shut off you won't see the level grow too much. It will grow some due to the oil draining back down from the heads. You will see the oil level go down in the sump tank on a dry sump car. I have to wait 5 min. after shutting the car off before checking the oil after it warms up to operating temp in my C7 Corvette Grandsport. It has a factory dry sump.

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Old 12-06-2020, 01:18 AM   #5 (permalink)
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Old 12-06-2020, 01:37 AM   #6 (permalink)
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Originally Posted by DrBacon View Post
Not overthinking it, has actually nothing to do with me but rather a friend's built 350z running ~9-10psi oil pressure at idle @ 1k rpm which by everything we've seen is for sure on the low side. We're just hoping it could be literally anything other than something internal.
Sounds like he's got the wrong size bearings.
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Old 12-06-2020, 03:34 AM   #7 (permalink)
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Originally Posted by DrBacon View Post
Not overthinking it, has actually nothing to do with me but rather a friend's built 350z running ~9-10psi oil pressure at idle @ 1k rpm which by everything we've seen is for sure on the low side. We're just hoping it could be literally anything other than something internal.
Back in the “Old-School” days, 10# per 1k rpm’s was acceptable...but idk on that particular engine
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Old 12-06-2020, 10:00 AM   #8 (permalink)
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Quote:
Originally Posted by DrBacon View Post
Not overthinking it, has actually nothing to do with me but rather a friend's built 350z running ~9-10psi oil pressure at idle @ 1k rpm which by everything we've seen is for sure on the low side. We're just hoping it could be literally anything other than something internal.
Has he checked/replaced his galley gaskets on the front cover. This will cause him to loose the engine if he keeps driving it like this.
If the engine was just built, he's got problems with clearances.
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Old 12-06-2020, 12:38 PM   #9 (permalink)
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Quote:
Originally Posted by DrBacon View Post
Not overthinking it, has actually nothing to do with me but rather a friend's built 350z running ~9-10psi oil pressure at idle @ 1k rpm which by everything we've seen is for sure on the low side. We're just hoping it could be literally anything other than something internal.
Rule of thumb: OIL QUANTITY will not fix oil TEMP. or Oil Pressure problems!

(ok unless, you run so low that you aint picking the dam oil up-then it's your fault. LOL)

(or if you put too much in and the oil has no where to go, you'll build some sort of pressure.......somewhere. LOL.)
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Old 12-06-2020, 02:52 PM   #10 (permalink)
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Old 12-06-2020, 07:31 PM   #11 (permalink)
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1000hp build, I doubt it. I know what that takes and a first time engine builder can't put it together properly. I know how in-depth my engine build was and there is no way I could have done it properly.
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Old 12-06-2020, 08:44 PM   #12 (permalink)
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Old 12-06-2020, 11:23 PM   #13 (permalink)
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Sounds like it is time to fix it now or destroy everything he built. I would suggest he takes it back apart and figure out what is going on.
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Old 12-07-2020, 01:13 AM   #14 (permalink)
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Sounds like it is time to fix it now or destroy everything he built. I would suggest he takes it back apart and figure out what is going on.
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Old 12-07-2020, 10:50 AM   #15 (permalink)
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Did he put a new oil pump in? That's one of those details that first time builders miss...
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