the MANN-Hummel centrifuge units are routinely installed on marine engines of up to 10,000hp
MAN-B&W, MTU-Detroit, Ssangyong, Wartsila are but some. These engines may have an oil capacity of 1500litres+ - the larger centrifuge units hold up to 6ltrs of dirt
It is important that the 10c paper insert is used on the wall of the centrifuge rotor cover and then the contaminants take a few seconds to remove - no digging!
I have used cartridge type by-pass filters on a variety of earthmoving equipment (dozers, scrapers, loaders etc.) and trucks - since the 1960s!. They were once common as a xtra spec option and installed externally alongside the hood on bonneted trucks. I do not know of a truck Manufacturer selling in OZ that offers them as an option now. The centrifuge seperator is a very different animal indeed
I would not start a new heavy diesel engine in any application without a centrifuge being installed first
For those wishing to use a TP or cartridge by-pass filter - great. This thread was however concentrated on the oil centrifuge - which incidently has been around for about 70 years!
Ralph - you said;
"I have a testimonial letter from a trucking company in Queensland with over a million K on a Detroit engine with no oil drains using depth filters."
I do not plan to commence a "...mine is best..." or "I'll show you mine if you show me yours" debate. For me I pay the bills and sign the capital cheques - if it does not pass the cost effectiveness/whole of life test it does not get purchased!
Many commercial equipment owners do not do this and that is why they still use mineral oils and the other "easy" technology that they feel comfortable with
I have however learnt to become very reticent about claims and testimonials.
An oft sold one of the classics in the heavy truck Industry is saying "...you get better fuel economy with XXX oil over YYY oil" Really????
Another is tyre brand and wear!
Unless facts and figures can be produced such claims can be quickly discounted - the variables usually overwhelm the "facts"
XS650 - the centrifuge model I use spins at up to 6000rpm