Originally Posted By: dvldoc
Questions, say you have 2 filers on a dual remote mount set up. One is Luberfiner Imperial XL series with is Absolute at 20 microns & 5 microns nominal, the other is a LF9028 Venturi combo filter whose bypass section is 5 microns absolute.
What does that make the 5 micron efficiency on a single pass? with both filters.
How's your Cummins engine doing.
I think there's a couple different things you're looking at.
The Luberfiner XL series is an "Extra Life" full flow filter.
The Venturi Fleetguard is a Full Flow and By-pass combination filter. So there are two elements within the can. Same as Luber-finers equivalent.
Fleetguard uses the stack disc media. Luber-finer and others use a straight synthetic media as the by-pass portion of the element.
As with any by-pass element the flow is "metered" or controlled to take less than 10% of the oil flow volume. By slowing the flow down you can increase the efficiency.
Back to the question at hand. A 5 micron absolute and 20 micron nominal rating for a full flow element is about correct. 10 micron absolute equates to 25 micron nominal as well.
But be careful thinking an ISO test meets Cummins Filtration specs. Cummins uses their own test procedures. One of which is not to use AC test dust. Cummins uses Soft-C which is a sludge of material which includes carbon black. Nasty messy black stuff.
So neither element is a 5 micron single pass absolute rated filter. All are tested multi-pass.