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Oilybits Wall Mounted Centrifuge
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Oilybits Wall Mounted Centrifuge

Oilybits OB-Series Centrifugal Oil Cleaners, mounted with 316 Stainless Steel Bolts to a 15mm thick, wipe clean, black HDPE Back Board and fitted up to a Pump, Washable Inlet Filter, and all Pipework and Fittings. The board can be drilled by the user and screwed or roll-bolted to a wall or stand

OB-020 / OB-025 Shown Above, OB-050 / OB-050-INVERT Shown Below

This type of centrifuge uses pressurised oil as a wet seal to prevent wear, and turns the incoming liquid flow into a fine jet which propels the rotor at speeds of up to 9100 RPM, creating centrifugal forces of 4166 times gravity. At this point all heavier-than-oil particles such as soot, dirt, swarf, earth, glycerine, fat, grease and water, are forced to the outside wall of the rotor, where they mass into a solid, or near solid layer, cleaner oil then flows outward into your storage vessel. Multiple passes (up to 3) may be required to gain the highest purity, as the centrifuge uses the incoming oil as a wet seal, and therefore passes some dirty oil throughout its operation

By increasing G-Force, you are doubling the relative weight of an object by 100% per 1G, at 0G an object weighs true upon the surface of the earth, at 1 G an object weighs twice its true weight, so, for example at 4000 G, a particle of dirt which might weight 0.1 gram will weigh 400 grams, and because of this, it will settle through a body of liquid much faster than it would if it were its original weight

The centrifuge will require emptying of contaminants periodically, although regularity will depend upon how contaminated your oil is, the better you strain your oil beforehand, the longer the centrifuge will operate before cleaning is required. Oil is filtered to 80 microns at the pump inlet, by a 10" Deep, Washable Nylon Monofilament Filter, this is mainly to protect the pump from damage. The pump and centrifuge are fully user-serviceable for cleaning and or maintenance

For cleaning of lubrication oil that has been used in a combustion engine, please note that whilst the centrifuge will remove all heavier-than-oil particles, it will not reverse changes that have occurred to the oil at a molecular level - for example the black colour of used engine oil is not only caused by carbon deposits such as soot (which will be removed) but by a change in the molecular structure of the oil caused by the combustion of hydrocarbons within it, and this colouring cannot be removed by using a centrifuge or any other means of fitration

Pictured Below, OB-020, OB-025, and OB-050(-INVERT)


There is one technical anomaly in the range, this is the OB-050-INVERT model. To achieve the much greater speed that this unit has, and the larger sump, the propulsion jets are situated on the top of the machined rotor, however, whereas a normal centrifuge will continue to hold this waste after the centrifuge has been shut down, the OB-050-INVERT will not hold onto any liquid waste, and this will drain out through the bottom when the centrifuge stops spinning.

Summarising, not only does OB-050-INVERT have by far the greatest G force (making it more efficient per pass), it also retains 50% more dirt and water than OB-050, and slightly more than the next model up OB-060, BUT it will not hold onto liquid waste when the centrifuge stops spinning.


The Oilybits Wall Mounted Centrifuge is almost completely a ready-straight-out-of-the-box system. The only adjustment required before the centrifuge is run, is the adjustment of the pressure control screw on the pump, to ensure the pressure into the centrifuge does not exceed 7 Bar. This needs to be set up after installation as the mounting height of the centrifuge above the vessel from which oil is being drawn, will affect any pressure that could be pre-set by us

The back board should be screwed or bolted to a vertical wall, rubber bushes could be used to dampen vibration and noise between the plate and the surface of the wall if required (not included). Once the back board is fixed, the drain hose is shortened to the appropriate length, connected to the bottom of the centrifuge with a jubilee clip and fed into a collection vessel directly below it. The suction hose is then shortened to the appropriate length and affixed to the filter inlet with a jubilee clip. The suction hose can then be placed into a vessel of HEATED waste oil, this should be at @40c

After switching on the power, the pump will self-prime, therefore drawing oil up into the filter, and through into the pump. Once the pump is wetted the pressure gauge reading will begin to rise, at this point the lever valve into the centrifuge should be closed. The pressure on the gauge will stabilise at any point between 0 and 12 Bar. Behind the pump inlet there is a brass slot-head screw, turning this screw anti-clockwise will reduce the pressure on the gauge, turning it clockwise will increase the pressure on the gauge. Turn the screw until the presure on the gauge reads 7 Bar, then open the valve into the pump, the pressure will then drop a little, so increase it back to 7 Bar, the pressure is now set and will not need adjusting again

The Centrifuge will now spin up to its maximum RPM, the stabilisation in noise pitch will identify when the maximum RPM has been achieved, this is when the centrifuge is most efficient, oil coming through the drain tube at this speed will be cleaner after a single pass than oil passing at a lower RPM


Due to a large number of enquiries following supply, we have enhanced the information and manuals provided with the equipment, and summarise what to expect (in average workshop conditions) from a Centrifugal Oil Cleaner below;

Purpose - An OB Series Centrifuge is a progressive fuel-polishing device, it is not intended to purify foul oil in one pass, moreso to gradually remove contaminants from oil that cannot be removed by the lowest rating of washable filter (this being 80 micron), and particles that are too small to be removed by any filter (smaller than 1 micron), by combining Washable Filters Socks, or Washable Filter Elements with a Centrifuge you can eliminate the need for disposable filter elements.

Particles - Any centrifuge will remove heavier-than-oil particles, but it will find it more difficult to seperate any particles if the main body of oil is heavily contaminated with material of the same Specific Gravity, in this case it would help if the oil is filtered / settled out to a better standard before pumping into the Centrifuge. The cleaner the main body of oil is, or gets, the faster the rate of separation will be, the progressive cleaning action of the Centrifuge will mean that the speed of cleaning will increase as the oil gets cleaner.

Liquids - Any centrifuge will remove heavier-than-oil liquids by the same means as it removes particles, but it will not remove "miscible" liquids, for example liquids that have the same "Specific Gravity" as the oil, or contaminants that are bonded to the oil molecules chemically. It is worth noting particularly with liquids that the maximum capacity of the centrifuge rotor cap (where dirt is held) is approximately 295 Grams, if you pump a lot of water, glycerol, or animal fat through the Centrifuge then it will become full very quickly and this will prevent further separation of contaminants, and additional contaminants will be forced straight through the Centrifuge.

Number Of Passes - An OB Series Centrifuge is not designed to purify oil in a single pass, unless the oil is very clean. The speed at which the Centrifuge separates contaminants from oil is determined by the cleanliness of the main body of oil and the RPM (not the RPM alone). The Centrifuge Rotor is driven by oil squirting out from two small jets around the circumference of the rotor base, creating a propulsional force, without the jets the rotor will not spin, so to spin at all it needs to pass oil at a rate of about 3 lpm... if your oil is too contaminated then most contamination will go straight through the Centrifuge with the oil to provide the propulsion, and only a small amount of contamination will be separated in the initial pass/es, if your Centrifuge fails to remove anything after repeated passes then your oil may need to be strained to a better standard beforehand.

Perseverance - OB Series Centrifuges take a bit of getting used to, many people expect too-much-too-soon and get frustrated without investigating their problems properly. Most problems are experienced by those who purify waste vegetable oil, and are mostly caused by excessive animal-fat in the oil (this is white in colour at room temperature) Animal Fat makes the oil cloudy and, being almost the same S.G. as the oil, makes it extremely difficult to separate. We recommend passing a small amount of oil through an ion-exchange or cellulose media to determine if any cloudiness is caused by animal fat

Working Diagram Shown Below:

Various Sludge Deposits Shown Below:

Wall Mounted Centrifuge Specification
Centrifuge TypeOB-020OB-025OB-050OB-050-INVERT
Pump TypePiusi Viscomat 200/2Piusi Viscomat 200/2Piusi Viscomat 230/3Piusi Viscomat 230/3
Mounting Board DimensionsW330 x H500 x Th20 (mm)W330 x H500 x Th20 (mm)W330 x H500 x Th20 (mm)W330 x H500 x Th20 (mm)
Max Particle Tolerance250 Micron250 Micron250 Micron250 Micron
Max Contaminate Storage200 CC250 CC500 cc750 cc
Nozzle Area    
Minimum Pressure2 Bar2 Bar2 Bar2 Bar
Max Pressure7 Bar7 Bar7 Bar7 Bar
Max Flow Rate210 LPH210 LPH540 LPH660 LPH
Max Temp (Celcius)90909090
RPM @ 2 Bar3500350035000
RPM @ 3 Bar5000500050005500
RPM @ 4 Bar6200620062007000
RPM @ 5 Bar7200720072008200
RPM @ 6 Bar8100810081008800
RPM @ 7 Bar9000900085009100
Max G Force at Rotor Wall3395 G3395 G3435 G4166 G

See the Oilybits OB-020 Centrifuge on Blue Peter! Youtube link below;

Read Lindsay Porters 4 Page Article on the OB-020 in the November 2009 Issue of Land Rover Monthly:

32mm Socket -To remove the Rotor nut on OB-050-INVERT you will need a 32mm Socket, these can be purchased from us. The socket we offer has a 1/2" Square Drive

Download Oilybits Centrifugal Filtration - Help Sheet PDFDownload Centrifugal Filtration - Help Sheet PDF

Download Oilybits OB Series Centrifuge Pump - Pressure Warning Sheet PDFDownload Oilybits OB Series Centrifuge Pump - Pressure Warning Sheet PDF

Download Oilybits OB Series Centrifuge - Service Instructions PDFDownload Oilybits OB Series Centrifuge - Service Instructions PDF

Download Oilybits OB-050-INVERT Centrifuge - Service Instructions PDFDownload Oilybits OB-050-INVERT Centrifuge - Service Instructions PDF

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Product CodeOILN144

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