Scania used to fit a centrifugal oil filter on their truck engines, with a small direct full-flow filter in the line to the turbocharger.
AlfaLaval made oil and fuel centrifuges, and still do, for bulk treatment of liquids.
Shouldn't be too hard to make something up that processes waste oil to get rid of the dirt and carbon in there.
We have some old Ruston & Hornsby sales brochures on running their horizontal diesels on waste engine oil, seems like it was quite a big thing in the post WWII years, with big garages/service stations deriving all their electricity from generators running on this fuel.
Peter
Peter,
Very interesting! I am running an experimental research setup which I have cobbled together in the past six weeks using what I know about using waste motor oil and bunker-c in a spray nozzle oil furnace having developed that technology to a degree of perfection when stationed at a remote research outpost in Canada`s Western Arctic bacik in the 80`s. I have been building the fuel processor after getting my recently purchased (thanx AltoPro!) JiangDong 175A engine all set up on a base with 2 kW generating alternator head recovered from a Kohler gasoline plant.
I had first light yeasterday and ran the engine at near full 1800 RPM output (1.8 kW load at 115 VAC, 60 Hz)) for just over four hours on my stock of filthy WTF, All appeared to be nominal until it started to miss and stutter and then I noted my DIY injector heater element had failed open circuit. This caused my FI temp to drop from 150 C to about 100 C, where it runs with self engine heat.
Today`s work schedule is to remanufacture and install a new DIY IP heater aftwer trying to determine what caused the failure of the first one. It was eight parallel strrands of #22 AWG Nichrome, all about 12 inches long inside a continuous sleeve of ceranic interlocking cupped beads. The pack ran non-incandescent at 3 VAC. Lot`s-o-amps. 60-100 watts depending on supply xfmer tap.
I plan a descriptive expose on this forum once I am able to post pictures. I use heat and gravity to remove the water and two fuel filters, a water blocking 10 micron and then a 2 micrton Caterpillar filter to clean the fuel oil prior to hitting the IP pump.
I had given a lot of thought to fabricating a centrifugal filter and still do want to give that a try.