Baldwin Filters Australia
As modern, high-performance engines have continued to
evolve over the past 50 years, so has the requirement for
more sophisticated oil filters. While filters play a “passive”
role in engine protection, they nevertheless must work to-
gether with the lubricating oil to keep engines protected
and clean.Modern oils play vital functions in protecting engines, es-
pecially in heavy-duty situations such as trucking, construc-
tion, mining and agriculture. Lubricating oil acts to reduce
friction and wear, cool engine parts, seal combustion cham-
bers, clean engine components and inhibit corrosion.
These functions are carried out by special additives in the
oil, which complement the action of the oil itself. The pro-
tective action of the lubricating oil and its additives are sup-
ported and balanced by the work of the lube filter.Lube filters, particularly those designed for heavy-duty ap-
plications, have the sole purpose of keeping damaging con-
taminants away from sensitive engine parts. Filters trap oil
contaminants in two ways:
Some particles “adhere” to filter media as the oil flows
through the filter. Such particles attach themselves to
the media surface without plugging up the media
Other particles are trapped in the filter media by the
pressure of the oil as it flows through the filter. As the
oil changes direction in its path through the filter, par-
ticles are driven or “impinged” into the media. Ideally,
most of these particles are trapped in the outer portion
of the media, leaving inner media surfaces open to
continue catching particles that slip through. Eventu-
ally, however, media pores will “fill up” and the filter
will begin to lose its effectiveness and will need to be
replaced.The Basics of Lube FiltrationThe purpose of a lube filter is to promote long system life by keeping damaging contaminants away from sensitive engine components. Particles that are the most dam-
aging are in the 5 to 20 micron range. To put this in perspective, the thickness of a
human hair is about 50 microns in diameter.Contaminants come in several forms:
Ingested. Those that enter with the fuel, air or oil.
Built In. During the assembly of the engine, some dirt will be left in. Core
sand is relatively common.
Created. As the engine runs, friction between moving parts causes minute
pieces of bearings, cylinder walls, pistons, etc. to break off and circulate
through the fluid stream.
Over the years various filters have evolved:
By-Pass filters — with a by-pass system, about 10 percent of the oil flow is
finely filtered and returned to the sump where it sweetens the dirty oil. It’s a
continual process and within minutes all the oil is filtered.
Full-Flow filters — with this system 100 percent of the oil is filtered before it
reaches the bearings. It is less restrictive and more free-flowing than a by-pass
filter and should remove all particles large enough to cause immediate damage.
Dual-Flow filters — with this method, all oil is continuously filtered by the
full-flow filter before it reaches the engine’s critical components. About 10
percent of the oil is diverted to the by-pass filter where it is scrubbed of fine
contaminants. Oil from the by-pass is then returned to the sump.