Centrifuge FAQ’s
Fitment
No. Almost all medium to high-speed diesel engines have minimum surplus to requirements oil pressure at lube pump in excess of 30%. The Mann+Hummel centrifuge takes up to a maximum of 10% of the engine oil pump output.
Therefore it is important to use the correct Mann+Hummel oil cleaning centrifuge for the application.
A full flow filter is a barrier filter – It stops large particles and should be left on the engine. Certain engine manufacturers fit a by-pass filter to tackle small damaging particles. Most by-pass filters can only filter down to around 10 microns. Most are around 20 microns.
When you fit a Mann+Hummel centrifuge you must remove any additional by-pass filter unless it is incorporated in the full flow filter, this because collectively they could affect the oil pressure. As the centrifuge is the superior cleaner, extracting dirt particles less than 0.25 of 1 micron, there is not need to have both bypass filters. This always results in an added economy and extends oil life.
Function
No. All additives are in solution. The centrifuge, at best, creates G forces of around 3,000 times the force of gravity and cannot remove additives. It is like sugar mixed with coffee, it cannot be removed once in solution.
Spent additives, when mixed with soot, become additional wear particles and contribute to oil thickening. Only spent additive package in lubricating oil is removed along with soot and other debris by the centrifuge.
It’s to be remembered that additives deplete, that’s why we change oil. It is also a known fact that the dirtier the oil the quicker the additive pack will destruct. This explains why engine oil burn often stops or decreases and oil lasts longer soon after fitting a Mann+Hummel centrifuge.
The perfect installation for the fitment of a Mann+Hummel centrifuge to an engine is with an oil specification of SAE30 or multigrade with a temperature of 75 (C) degrees or higher.At 75 degrees (C) on a SAE30 = 25CST this low viscosity through the centrifuge will create greater rotational speed as there is less restriction.
In conclusion, the hotter the oil and the thinner the oil the better the dirt/soot separation. The less abbrasives in the oil the longer engine componentry life, which results in substantial $avings in rebuilds and down time and of course dollars and cents. The better the oil quality, the better the result.
The Mann+Hummel Centrifuge has an excellent track record in controlling soot. Today’s modern diesel engines all suffer from some sort of soot related problems, some much more than others.
When soot is present in lube oil and not removed, not only will you see oil thickening but the soot has the ability to attack the ZDDP antiwear additive. This results in premature breakdown of the oil. We are unaware of any filtration system that will extract 100% of the soot particles from diesel engine oil. however, we have seen oil reports that show consistent extraction of particles of less than 0.25 of 1 micron.
The Mann+Hummel centrifuge is widely accepted as the industry leader world wide for maintaining traditional oil change intervals. Also with Quality oil sampling, and very best quality oils, many centrifuge users can substantially extend oil & filter change intervals while maintaining the boundaries of OEM oil cleanliness parameters. This will also achieving substantially extended engine life before rebuilds.
Definitely not. The centrifuge has a preset cut off valve set at approximately 19psi and it cannot function under that pressure. If the engine oil pump became weak or ceased to work, once the pressure dropped to less than 19 psi the oil supply to the centrifuge would be cut off. Therefore the Mann+Hummel centrifuge can never contribute to engine failure.
That factor is one of the significant reasons why the Mann+Hummel centrifuge enjoys the support of over 50 engine manufacturers worldwide.