What is Crankcase Microfiltration?

What is Crankcase Microfiltration?

Crankcase microfiltration is a green eco-friendly strategy to build sustainability and reduce costs by continuously recycling crankcase oil through a microfilter as the engine operates. This provides highly desirable point-of-origin pollution control by recycling the oil in the engine compartment to remove particle contamination as it is created by the engine or ingested from the atmosphere. ECO MicroFilters capture the 1-10 micron clearance-sized particle microgrit contaminants.

ECO MicroFilters are installed in the engine compartment. An input hose brings dirty oil from the engine to the microfilter. An output hose returns the micro-cleaned oil back to the engine crankcase. The device is installed in the by-pass mode, that is, the oil stream is not in series with the full-flow filter. The small microfilter oil stream is in parallel with the full-flow oil stream. On the top of ECO MicroFilters are oil sample valves, which provide a convenient and accurate method to sample the oil circulating in the engine while the engine is operating. The sample valve provides a sample of the unfiltered oil pumped from the engine before the oil is filtered through the microfilter cartridge.

Can the Engine’s Current Filtration Support Doubling the Oil Drain Interval?

No. The engine’s current full-flow filter only provides absolute filtration down to approximately 35 to 40 microns. Full-flow filters do not remove the harmful 1-10 micron particle microgrit, which cause the majority of the engine’s wear and friction and depletes the oil’s additive pack.

How Can Crankcase Filtration Be Improved?

Crankcase filtration can significantly improve filtration and removal of harmful microgrit.



How Do ECO MicroFilters Operate?





Do ECO MicroFilters Replace the Engine’s Full-Flow Filter?

No. The full-flow filter is not modified. It remains in operation as designed. The crankcase microfilter is added to the lubrication system in by-pass mode and is not in the same path as the full-flow filter.

How Do ECO MicroFilters Compliment the Full-Flow Filter?

By analogy, in a full-range speaker system, there is a woofer designed to handle the lower frequencies and a tweeter designed to handle the higher frequencies. With ECO MicroFilters installed the full-flow filter continues to capture the larger particle contaminants 35 microns and larger with absolute efficiency, while the crankcase microfilter is designed to capture particles with absolute efficiency from 10 microns down to 2-3 microns or less, which is the size of bacteria.

Can ECO MicroFilters Support a 50% Reduction in Hazardous Waste Oil?

Yes. Several fleet demonstrations demonstrate that the oil drain interval can be doubled with microfiltration, which will reduce both hazardous waste oil production and the consumption of petroleum based lubricating oil by 50%. Better filtration will allow the fleet to take full advantage of today’s superior new oil formulations.

What Size Particles are Captured in a Microfilter?

The crankcase microfilter is designed to operate with high efficiency in the 1 to 10 micron range. One micron is equivalent to .000039 of an inch. Particles in the 1-10 micron range are invisible to the unaided human eye. A person with good vision can see down to approximately 40-50 microns. The 1-10 micron range is the invisible range of the oil films between the moving parts. (See below, Clearance Size Particles, CSP.)

As illustrated below, there is an enormous difference between a 35-40 micron particle, the smallest particle captured by the full-flow filter with absolute efficiency, and a 2-3 micron particle, the size of bacteria, which is captured by the crankcase microfilter. A 3-microns size is the distance between the engine’s rapidly moving piston ring and the cylinder wall.


What can I do?

See ECO Microfilters Bypass Oil Filtration Systems