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New bypass system - How slow is too slow? #4445024
06/29/17 02:13 PM
06/29/17 02:13 PM
Joined: Jun 2017
Posts: 8
Southern Indiana
Mr4btTahoe Offline OP
Mr4btTahoe  Offline OP
Joined: Jun 2017
Posts: 8
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?

Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445059
06/29/17 02:46 PM
06/29/17 02:46 PM
Joined: Aug 2003
Posts: 12,901
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 12,901
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.


2019 Jeep Cherokee Trailhawk 2.0T
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445097
06/29/17 03:33 PM
06/29/17 03:33 PM
Joined: Jun 2017
Posts: 8
Southern Indiana
Mr4btTahoe Offline OP
Mr4btTahoe  Offline OP
Joined: Jun 2017
Posts: 8
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.

Last edited by Mr4btTahoe; 06/29/17 03:37 PM.
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445115
06/29/17 03:50 PM
06/29/17 03:50 PM
Joined: Nov 2009
Posts: 4,942
Houston, Texas
motor_oil_madman Offline
motor_oil_madman  Offline
Joined: Nov 2009
Posts: 4,942
Houston, Texas
The fs2500 says it flows 1.5 quarts per minute.

Last edited by motor_oil_madman; 06/29/17 03:52 PM.

2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445118
06/29/17 03:53 PM
06/29/17 03:53 PM
Joined: Sep 2015
Posts: 5,858
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,858
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

Last edited by BrocLuno; 06/29/17 03:55 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445126
06/29/17 04:00 PM
06/29/17 04:00 PM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
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.

Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445128
06/29/17 04:02 PM
06/29/17 04:02 PM
Joined: Jul 2008
Posts: 1,090
British Columbia, Canada
ecotourist Offline
ecotourist  Offline
Joined: Jul 2008
Posts: 1,090
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).


2000 BMW 528i 5MT
2007 Honda Accord EX-L 4Door V6 6MT
Re: New bypass system - How slow is too slow? [Re: ecotourist] #4445132
06/29/17 04:06 PM
06/29/17 04:06 PM
Joined: Jun 2017
Posts: 8
Southern Indiana
Mr4btTahoe Offline OP
Mr4btTahoe  Offline OP
Joined: Jun 2017
Posts: 8
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?

Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445188
06/29/17 05:03 PM
06/29/17 05:03 PM
Joined: Jan 2017
Posts: 632
Melbourne, Florida
RichardS Offline
RichardS  Offline
Joined: Jan 2017
Posts: 632
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.


2008 Dodge Caliber SE 2.0 117k
4qt Imeditsu 0w-20, 1/2qt Mobil SS 5w-20 Fram HM

2003 Buick Century 107k
4.5q Havoline 5w-30 HM Fram XG
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445195
06/29/17 05:10 PM
06/29/17 05:10 PM
Joined: Oct 2014
Posts: 11,849
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,849
Idaho
See the flow with hot oil.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445284
06/29/17 07:13 PM
06/29/17 07:13 PM
Joined: Sep 2015
Posts: 5,858
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,858
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


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445340
06/29/17 08:16 PM
06/29/17 08:16 PM
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Corelokt Offline
Corelokt  Offline
Joined: Sep 2014
Posts: 163
Tug Hill, NY
Would 1/8 copper gauge tubing be to small then?


86 CUCV. 6.5L. Level-3 4L80. NP205. 9-16 14 ply tires, HX35/40 turbo. WMI. 5" exh. ARP studs heads & crank. Cooling upgrades. Rattle can camo.
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445372
06/29/17 08:53 PM
06/29/17 08:53 PM
Joined: Sep 2015
Posts: 5,858
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,858
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.
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445449
06/29/17 10:06 PM
06/29/17 10:06 PM
Joined: Dec 2006
Posts: 527
ohio
xtell Offline
xtell  Offline
Joined: Dec 2006
Posts: 527
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

Last edited by xtell; 06/29/17 10:08 PM.
Re: New bypass system - How slow is too slow? [Re: Mr4btTahoe] #4445730
06/30/17 08:24 AM
06/30/17 08:24 AM
Joined: Jun 2017
Posts: 8
Southern Indiana
Mr4btTahoe Offline OP
Mr4btTahoe  Offline OP
Joined: Jun 2017
Posts: 8
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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