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#4445024 - 06/29/17 02:13 PM New bypass system - How slow is too slow?
Mr4btTahoe Offline


Registered: 06/29/17
Posts: 8
Loc: Southern Indiana
Hey guys..

Just finished up my first bypass system using an LF777 filter/head. On the outlet side of the filter, I added an .035 orifice as the built-in .100 was too big.

Testing flow... oil wasn't quite at full temp, I was getting 1/2qt in 3 minutes. Just a slow constant trickle out of the return hose.

I know that slow is good... but when is it TOO slow? This is now a 14qt system meaning at that rate, it would take over an hour to flow the entire sump through the filter.

I'm thinking this is too slow to be effective.

Thoughts?

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#4445059 - 06/29/17 02:46 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
Rand Offline


Registered: 08/20/03
Posts: 12638
Loc: NE,Ohio
Hard to give any kind of advice with lack of information.

If my math is right:
your orifice change was to aprox 1/9th the cross sectional area of the org. orifice of .1"

So yes probably too drastic a change.
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#4445097 - 06/29/17 03:33 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
Mr4btTahoe Offline


Registered: 06/29/17
Posts: 8
Loc: Southern Indiana
What information do you need?

The engine is a 7.3 IDIT. Oil capacity with this filter is ~14qts.

Oil pressure running down the road is ~40psi... 18-20psi at idle.

Oil being used - Delo 5w40 synthetic

I never attempted to run it without a restriction as the filter is designed for a much larger engine. Also from what I was reading, most bypass systems such as amsoil use .030" orifices.

Based on what I was reading, this orifice should flow .177gpm @40psi of water. Petroleum based oils have a multiplier of 1.07-1.27 which should come out to roughly 3/4qt per minute unless my math is off.

I'm currently no where near that.


Edited by Mr4btTahoe (06/29/17 03:37 PM)

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#4445115 - 06/29/17 03:50 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
The fs2500 says it flows 1.5 quarts per minute.


Edited by motor_oil_madman (06/29/17 03:52 PM)
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#4445118 - 06/29/17 03:53 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
BrocLuno Offline


Registered: 09/06/15
Posts: 5502
Loc: Kalifornia Kollective
I would not run less than 0.050" orifice with only 40 PSI. Flow is pipe size and pressure dependent. 40 PSI is fine for the engine, but is not moving much oil through 0.035" ...

0.062 is only 1/16th inch. That is not much of a flow orifice.

I drill 0.035" holes in the end plugs of the lifter galleries just to lube a roller timing chain laugh


Edited by BrocLuno (06/29/17 03:55 PM)
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4445126 - 06/29/17 04:00 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7471
Loc: S California
I've always use 1/16th of an inch or 0.0625 for stationary engines, pumps and over the road vehicles. I think that's 1.5mm but I'm not sure and I don't have a calculator here.

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#4445128 - 06/29/17 04:02 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
ecotourist Offline


Registered: 07/09/08
Posts: 1067
Loc: British Columbia, Canada
I don't know how fast oil is supposed to flow through a by-pass filter, but why isn't running all of the oil through a by-pass filter in about an hour a huge improvement?

My understanding is that oil coming out of a by-pass filter is unusually clean, similar to fresh oil (though without fresh additives of course).
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#4445132 - 06/29/17 04:06 PM Re: New bypass system - How slow is too slow? [Re: ecotourist]
Mr4btTahoe Offline


Registered: 06/29/17
Posts: 8
Loc: Southern Indiana
Originally Posted By: ecotourist
I don't know how fast oil is supposed to flow through a by-pass filter, but why isn't running all of the oil through a by-pass filter in about an hour a huge improvement?

My understanding is that oil coming out of a by-pass filter is unusually clean, similar to fresh oil (though without fresh additives of course).


That's why I'm asking if it's an issue or not. I don't know the ideal flow rate.

I wanted to know when slow is too slow... or when would flow be too slow to be effective.

As far as flow... the orifice I chose was rated - water @ 40psi. Using the multiplier, it should give the same flow rate for oil @ 40psi.. unless I'm thinking wrong?

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#4445188 - 06/29/17 05:03 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
RichardS Offline


Registered: 01/14/17
Posts: 616
Loc: Melbourne, Florida
On average, how long does it take you to complete 60 minutes worth of driving?

Is it a few days of driving, or a month? I think that might be of consequence in regards to flow rate.
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#4445195 - 06/29/17 05:10 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
CT8 Offline


Registered: 10/09/14
Posts: 10920
Loc: Idaho
See the flow with hot oil.
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#4445284 - 06/29/17 07:13 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
BrocLuno Offline


Registered: 09/06/15
Posts: 5502
Loc: Kalifornia Kollective
I'm a believer in the orifice should equal the flow rate through your filter media (new), providing it does not drop the oil pressure to the engine by more than a pound or two...

As the media becomes contaminated, it will slow the flow. But fresh media can attain full flow, or close to it smile

Another way to look at this, is how fast do you want the by-pass to process the volume of your sump. It would be nice if the filter could handle the sump volume in 4 hours or so. Including going back and mixing with existing sump oil, it will take ten to twenty passes to get the oil fairly clean. So that would mean 40 hours filter time to get decently clean oil. All gravy after that smile
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4445340 - 06/29/17 08:16 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
Corelokt Offline


Registered: 09/12/14
Posts: 163
Loc: Tug Hill, NY
Would 1/8 copper gauge tubing be to small then?
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#4445372 - 06/29/17 08:53 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
BrocLuno Offline


Registered: 09/06/15
Posts: 5502
Loc: Kalifornia Kollective
Prolly work ... smile
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4445449 - 06/29/17 10:06 PM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
xtell Offline


Registered: 12/13/06
Posts: 520
Loc: ohio
Think long term filtration and don't worry about slow oil flow rate (unless the slow flow is caused by the filter having reached it upper limit of dirt holding capacity). You are getting 1/2 quart every 3 minutes / one gallon every 24 minutes and there is no way to tell exactly how long ALL 14 quarts of oil in your sump will be run through the bypass filter since oil is being diverted to the bypass and at the same time it is going through a FF filter and circulating through the oil passages. Run it as is and rest assured that your oil is continually being filtered to low micron levels. Give the system you have installed time to work!!!

Nuff said,

xtell


Edited by xtell (06/29/17 10:08 PM)

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#4445730 - 06/30/17 08:24 AM Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe]
Mr4btTahoe Offline


Registered: 06/29/17
Posts: 8
Loc: Southern Indiana
Thanks for the input guys.

As far as running at the rating of the filter... I believe it's over 2 gallons per minute which would kill oil pressure fairly quickly. Lol

I'll run it and call it good.

Thanks again!

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