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oil return idea

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Old 08-19-2007, 03:54 PM
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i have a custom remote turbo set-up on my blazer. just swapped to a T-70 on the truck. i was working on my friends comptech charged s2000 and the return oil line goes back to the oil drain plug. i was wondering what would be wrong with doing something like this on sts cars/trucks. we do have oil pumps and instead of dropping all that oil into the valvetrain and heads why not just push it back into the oil pan?
Old 08-19-2007, 06:12 PM
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was it basically just a tapped plug? Might not work due to it being too small. I would go no smaller than 3/8" and I don't think the plug is that big. Maybe it is...
Old 08-19-2007, 07:35 PM
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It will not work, oil drain MUST be above the level of oil in the pan.

Although if it is being pumped back in, I guess its possible using the drain plug could work.
Old 08-19-2007, 08:04 PM
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I wonder if the pump can flow enough to pump back into the oil. Anyone with experience?
Old 08-19-2007, 08:12 PM
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Here is the only problem I see with it. The pump would have no problem pumping the oil back and into the pan as its rated to pump 25psi continusly and this would be well below that, BUT, it also pumps a lot of air at the same time, so you would be airating the oil in the sump and that might cause some problems.
Old 08-19-2007, 10:09 PM
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huh...... so still taping it above the oil line is the best method. i was just wondering.

on his s2000 there is no pump its just gravity feed.
Old 08-20-2007, 12:07 AM
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Gravity feed into the sump is bad news - foamy oil can easily back up and cause trouble. He needs to mod his pan.

I tried to get my Canton pan built with the oil returns in the sump and Canton would not build it, because of their experiences with oil return problems. They recommended at the front of the pan behind the windage screen.

Jim
Old 08-20-2007, 05:21 PM
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are teh STS pumps only 20psi?

so the oil would be foamy if you came through the drain plug?
Old 08-20-2007, 05:29 PM
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If it came below the level of oil...it is posssible.



Stick with what works. Oil drain above the level of oil in the pan.
Old 08-20-2007, 05:42 PM
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Originally Posted by 02Vortech
are teh STS pumps only 20psi?

so the oil would be foamy if you came through the drain plug?
These are the specs on the STS pump.

The compact GP-301 series gear pumps are designed to transfer lube oil, diesel fuel and water. Utilizing straight cut bronze gears and stainless steel shafts, the GP-301 transfers liquids up to 3 GPM. Used mainly for oil change and diesel fuel transfer, pre-luber, oil scavenging and similar applications. This pump will generate high pressures, but should be limited to 30-40 psi or damage to the motor will occur.
Old 08-21-2007, 04:29 PM
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Any pump can only generate pressure, if there is a restriction against the flow.

Pumping into the oil pan, should represent negligable resistance.
Old 08-21-2007, 05:16 PM
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Needs to be above oil level. Mine is returning to the pan above oil lever and still has problem getting it back fast enough. I had to buy a restricter for mine. I have braided hoses and all so it a good setup and still had issues keeping up.
Old 08-22-2007, 01:09 PM
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what pump and whats your setup? So it couldn't pump the oil back into the pan fast enough?
Old 08-22-2007, 01:26 PM
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sts pump and setup. without a restrictor it could not pump it back fast enough. I constantly had oil in the intake and exhaust pipes. I think one problem is there pump kinda sucks. But I have always heard to return it above oil level.

Tapping the pan isnt that hard. You can read on here how a lot of people tap it on the car with a drill bit and vaseline
Old 08-22-2007, 03:35 PM
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this is where I've put my return line into the timing cover:


Old 08-23-2007, 09:45 PM
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That's creative! I only would be concerned about the flow of foamy oil through a banjo bolt. No room for a nice 90 -8 or -10 fitting is there?

Jim
Old 08-23-2007, 10:32 PM
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Originally Posted by Tiger2o69
...I think one problem is there pump kinda sucks....
I think you are being too kind. It sucks big time, and not in a good way. I went round and round with them on this issue. But it does work after its own fashion.
After all:
Originally Posted by kbracing96
The compact GP-301 series gear pumps are designed to transfer lube oil, diesel fuel and water....



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