Bypass Filtration. Good or Bad?

[Diesel Thunder]

I read the benefits of the bypass setup on Amsoil's website, but are there any drawbacks (ie: pressure drops, volume drops, etc... ) to a bypass setup, regardless of the manufacturer? I agree it is a very interesting concept. What is Cummins' stand on the idea of bypass filtration? And are there any warranty problems with Cummins or DC?



I am thinking about getting a bypass setup myself, but what is the general consensus? Is it best just to keep the factory setup and continue my 5,000 mile drain intervals?



Thanks in advance.



Diesel Thunder.

 

[nickleinonen]

the only thing i would do different with a bypass lube oil filter setup is to put a spring loaded check inline before the filter, that would require 15-20psi before flow to the bypass filter would happen. this would keep your oil flow at max to the engine during hot idling. .

 

[Diesel Thunder]

So there could be potential risks for a bypass setup? Do you think they are worth the trouble, especially with such frequent drain intervals like mine (every 5K)? Thanks for your help.



Diesel Thunder.

 

[DavidThompson]

So there could be potential risks for a bypass setup? Do you think they are worth the trouble, especially with such frequent drain intervals like mine (every 5K)? Thanks for your help.



Diesel Thunder.

BYPASS SYSTEM is well worth the time and money... . all your bearings and rings will love you..... soot being like very very small sand circulates thur-out your whole engines and causes wear..... Before I added my system I could feel the soot between my fingers and now at 5000 miles I cannot... ... Your oil will stay much clearer for longer before turning black... ... . trucksalesdave... ... central Georgia

 

[steved]

the only thing i would do different with a bypass lube oil filter setup is to put a spring loaded check inline before the filter, that would require 15-20psi before flow to the bypass filter would happen. this would keep your oil flow at max to the engine during hot idling. .

I get a new idea everyday on here... and it always cost more money... :-laf



Now to get a check valve witha 15psi cracking pressure!!!



steved

 

[Gary - K7GLD]

Sorry guys - but you're barking up the wrong tree!



The restriction built into most typical bypass setups reduces actual oil flow and resulting effect upon system PSI so little that there's really no noticeable effect visible on the oil pressure gauge. Fact is, especially on a cold engine and thicker oil, there's a substantial volume of flow that gets bypassed from within the OEM full flow filter itself - I'm not sure about when the typical oil gets hot, but the full flow filter bypasses FAR more oil volume than the bypass filters would even BEGIN to divert from the system.



For reference, the hot oil flow provided in the Cummins is way up in the gallons-per-minute range, and a bypass filter like my Frantz diverts *1 quart per minute* - hardly enough to get paranoid over! :-laf

 

[Partyat33]

The bypass flow is tiny. Check valve is WAY overkill.

 

[steved]

The bypass flow is tiny. Check valve is WAY overkill.

But I like overkill and gadgets...



I only need clarification on one point Gary, I didn't think the CTD filters had a bypass valve built in?



steved

 

[Gary - K7GLD]

But I like overkill and gadgets...



I only need clarification on one point Gary, I didn't think the CTD filters had a bypass valve built in?



steved

As far as I know, virtually ALL OEM full flow filters have bypass valves built into them...



And yeah, I sorta like "overkill and gadgets" too... :-laf

 

[Duluth Diesel]

Bypass filtration is well worth it, and obviously I am biased toward AMSOIL's offerings and experience in the industry.

 

[Arkapigdiesel]

the only thing i would do different with a bypass lube oil filter setup is to put a spring loaded check inline before the filter

Unnecessary. Bypass filters have a restrictor orifice built in (usually 1/16" of an inch) and when the oil is cold the restrictor orifice acts like a brick wall to cold oil. Oil must be warm to flow good through a bypass filter.



There are no downfalls whatsover to bypass filtration, period. Who wouldn't want clean oil circulating through their engine at all times? Remember fellas, oil wears out and depletes its' additive package because of dirt, insolubles, fuel contamination, etc... With a bypass filter the small micron dirt and insolubles are filtered with a bypass filter, which in turn keeps your TBN and detergent package at higher levels in your oil.



If you have excessive fuel dilution or coolant contamination nothing will help that. That problem should be fixed.



Go to Bob is the Oil Guy and scroll down to the bypass filters section to do a little reading.

 

[Pawpaw]

I only need clarification on one point Gary, I didn't think the CTD filters had a bypass valve built in?

If there were no bypass, what would happen if the filter got completely clogged? It's better to circulate dirty oil than none at all.



In our case, it's built into the filter mount:



#ad




Bob

 

[steved]

If there were no bypass, what would happen if the filter got completely clogged? It's better to circulate dirty oil than none at all.



In our case, it's built into the filter mount:





Bob

That was my point thought, I didn't think the FILTER had a bypass in it... I knew we had a bypass somewhere, just wasn't sure it was in the filter...



steved

 

[amsoilman]

That was my point thought, I didn't think the FILTER had a bypass in it... I knew we had a bypass somewhere, just wasn't sure it was in the filter...



steved

I can tell you the "DONALDSON" ELF-7349, as well as the AMsoil EaO-80 have a built in by-pass valve. They are set to open between 8-15 PSI Differential, which means 8-15 PSI difference between the inlet pressure and the outlet pressure.



Wayne

amsoilman

 

[amsoilman]

the only thing i would do different with a bypass lube oil filter setup is to put a spring loaded check inline before the filter, that would require 15-20psi before flow to the bypass filter would happen. this would keep your oil flow at max to the engine during hot idling. .

A by-pass oil system, if set up properly will not lower the oil pressure. There is no need for a check valve!



Wayne

amsoilman

 

[Gary - K7GLD]

I vaguely remember reading about that bypass built into the Cummins filter housing - and certainly feel it is built far better than what we find in most OEM filter cartridges. On the other hand, unless the oil filters used on our engines are a single application unit, made ONLY for the Cummins, I wonder if they don't still also have a built-in bypass valve for other engine applications not following the Cummins design?



(EDIT)



AH, I see Wayne posted while I was still typing - and pretty well answered my question! :-laf

 

[Diesel Thunder]

Wow, this information is great! So the general consensus is that oil Bypass filtration is good. I am looking into the Amsoil unit, but are there any suggestions as to other units on the market?



Finally, are there any warranty issues with DC or Cummins?



Thanks.



Diesel Thunder.

 

[Gary - K7GLD]

You won't go wrong with the Amsoil unit.



My own experience as far as warranty is concerned, has been a big "thumbs up" from the service guys at Dodge - they are VERY aware of the positive benefits of bypass filtration...

 

[Arkapigdiesel]

Wow, this information is great! So the general consensus is that oil Bypass filtration is good. I am looking into the Amsoil unit, but are there any suggestions as to other units on the market?



Finally, are there any warranty issues with DC or Cummins?



Thanks.



Diesel Thunder.

Diesel Thunder,



I installed an Amsoil unit on my new '06 this past weekend. Here's a thread on it: https://www.turbodieselregister.com/forums/showthread.php?t=173564

 

[amsoilman]

Wow, this information is great! So the general consensus is that oil Bypass filtration is good. I am looking into the Amsoil unit, but are there any suggestions as to other units on the market?



Finally, are there any warranty issues with DC or Cummins?



Thanks.



Diesel Thunder.

Here is a copy of an article from "Fleet Equipment" Magazine. IT is an old document, but it does refer to By-pass oil filtration on the Cummins engines.



Author: Gelinas, Tom

Journal: Fleet Equipment Vol: 14 Iss: 7

Date: Jul 1988 pp. 39-41 Abstract:

According to some estimates, 60% of the potential causes of engine wear and failure can be eliminated by a well-designed and properly applied filtration system. Cummins Engine Co. recommends that both a bypass filter and a full-flow filter be used.

A bypass filter shunts 10% of the total oil pump output through a filter and then back to the sump, bypassing the engine. Because this filter has high-pressure differential and low flow rate, it can filter out fine particles in the 5-micron range. In contrast, a full- flow filter has a low-pressure differential and filters out only large particles in the 40 micron to 60 micron range. However, the full-flow filter is located so that all of the oil must flow through it before reaching the bearings.

The combination of these 2 filter types gives double protection against wear. Studies at the Cummins Technical Center indicate that wear can be reduced up to 91% by using a bypass filter in combination with a full-flow filter.







Wayne

amsoilman