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Oil drain back

General engine tech -- Drag Racing to Circle Track

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moparian
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Oil drain back

Post by moparian » Fri Oct 04, 2019 9:41 am

I am doing a couple of oil drain backs from the heads and i have a remote oil filter with 2 inlets and to outlets can i use one inlet for a return line or will the pressure it back up the line to the head,i only use one inlet and one exit atm or punch a couple holes in the top of the sump.

Coloradoracer
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Re: Oil drain back

Post by Coloradoracer » Fri Oct 04, 2019 11:19 am

Oil drainback lines from the heads should be plumbed to the oil pan. DO NOT USE the ports off the oil filter housing.
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Dave Koehler
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Re: Oil drain back

Post by Dave Koehler » Fri Oct 04, 2019 12:25 pm

Mark is correct and you answered your own question.
Your initial idea would plumb a gravity fed line into a pressure fed line.
Yes, it will go the wrong direction and essentially send the pressure to zero.
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MadBill
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Re: Oil drain back

Post by MadBill » Fri Oct 04, 2019 8:12 pm

Also, gravity alone is not enough to push oil through any worthwhile mesh filter.
Felix, qui potuit rerum cognscere causas.

Happy is he who can discover the cause of things.

moparian
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Re: Oil drain back

Post by moparian » Fri Oct 04, 2019 8:52 pm

Thought that may have been the case ,Cheers guys

moparian
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Re: Oil drain back

Post by moparian » Fri Oct 04, 2019 11:39 pm

Will a vacuum pump make the problem worse or help with getting the oil back down to the sump?

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MadBill
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Re: Oil drain back

Post by MadBill » Sat Oct 05, 2019 12:14 am

Depends. If you suck from a rocker cover, likely worse. If from the valley, better.
Felix, qui potuit rerum cognscere causas.

Happy is he who can discover the cause of things.

moparian
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Re: Oil drain back

Post by moparian » Sat Oct 05, 2019 3:37 am

MadBill wrote:
Sat Oct 05, 2019 12:14 am
Depends. If you suck from a rocker cover, likely worse. If from the valley, better.
It pulls from the valve cover now but i will do a fitting on the valley plate.Cheers

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