giannid
Registered User
Hi, I'm new to the forum and am a contractor that has saved my waste oil from my trucks over the years and this winter I decided to build a centrifuge made up of parts I purchased locally and online. What I have is a dieselcrafraft oc50 centrifuge, Oberdorfer 1/3 hp gear pump, drum heating band from pa biodiesel, 100 micron strainers for pre filtering before the oil goes in the drum, thermostat in drum from pa diesel, some valves and gauges from home depot and a hot water pressure relief valve from home depot. I modified the drum, insulated it, and installed a bottom drain to drain and garbage from the bottom of the drum. Also, have it configured so I can pump the oil right into the trucks through a donaldson polishing filter. So my process is mix 35 gallons of waste motor oil with 10.5 gallons of diesel fuel, mix it for about an hour while heating it which is a 70/30 mix. Then I start to run it through the centrifuge and try to keep the oil between 140 to 180 degrees and 80 to 90 psi.. I shut the band heater off when it gets to 180 and that usually lets me filter it for awhile before I need to turn it on. It seems like the first day of filtering the oil I need to clean out the centrifuge twice as it got so gunked up on the first batch it stopped spinning. After the first day I clean the centrifuge one time a day. I've done 2 batches so far and the first batch I filtered for 4 days and the second one I filtered for 5 days. Is that normal or should I go longer or shorter? Seems like I'm still pulling contaminants out of the oil when I'm finished. I take it the centrifuge will always pull more out but when do you know when to stop? I have a 3 micron polishing filter and I figure that will get the rest out. I also let the oil sit for 24 hours to let the air out before using it. I ran two batches of it so far (90 gallons) in a 99 ford f800 dump truck with a 5.9 cummins in it. The truck seems to run a little better on it than regular diesel other than smoking a bit when it's idling. I have a tandem axle dump truck with an M11 cummins in it I'm going to try next but I'm thinking of a 50/50 mix in it. Is there anything else I should be doing? What is this coking of injectors I'm hearing about and is there anything I can do to help prevent it? The disease I'm mixing with it is a premium diesel fuel from a local supplier that is supposed to have soy and extra lubricity additives. We've always had good luck with there fuel. I'm in Ohio and plan on running the wmo only in the fair weather months. The trucks are both stock and no modifications have been made. ANy recommendations or comments would be appreciated. I also put an extra fuel filer with what I need to change it with in the truck I ran it in just in case. After 90 gallons no problems with the fuel filter yet. Thanks!
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