BenzWorld Senior Member
Date registered: Oct 2005
Vehicle: MBZ '87 300SDL, MBZ '85 380SL, RR '77 Silver Shadow II, MBZ '98 E300TD
Location: Currently in SoCal, originally from far far away
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
This thread wasn't about whether you should run WVO in an OM606 motor, but whether a Facet pump or a similar low pressure electric pump with 3/8" fittings was a meaningful upgrade to help keep the fuel lines air-free.
As for WVO, if and when I run it in this car again, the issue that crops up is the same as it its always been: The quality of the oil stock used for the fuel, the process used to clean it up before using it, and finally, reaching and maintaining sufficient fuel pre-heating temperatures that then have to pass the heated oil into the mechanical lift pump which in turn feeds the injection pump.
I realize some hobbyists are doing the absolute minimum with their oil and that's the problem. Oil needs to be treated through a number of processes before I would consider it safe to use. Folks who just let it settle and skim their settling tanks with a pickup tube attached to a 12V gear driven pump for transferring oil either into a storage tank or the car's fuel tank are missing steps that really shouldn't be skipped. I'll also say that where you get your waste vegetable oil is also important and one of the reasons I'm not feeding the car WVO right now - it's strictly B99. The tempura place I used to collect from has made arrangements (while I was off on contract in another state) for someone else to collect their oil. I've been cut out of the free fuel that I used to get from them and a lot of the other places with second-best quality oil have changed owners, changed the frequency of their oil refills and the quality of their oil has slid further down the preference scale in addition to needing to sweet talk the owner, who might not even live in this state, into allowing me to collect their waste oil and explain the legalities to them in 5 minutes or less, which is about as long as you'll get many owners to talk to you about this subject. Emphasis has to go reducing their expenses and that it is legal for me as the collector and for him/her as the authorizing party to allow me to take it off their hands and haul it away. "I'll take it off your hands for free sir/mam so that you don't have to pay for collection, and it's all legal, I even have my permit right here!". That tempura place had the cleanest, sweetest smelling and easiest oil to quickly let it go through initial settling before passing it through the filters. It was also only 2 blocks away. Too bad.
After settling, I run the oil through a modified 55 gallon steel drum with heating elements (30 amp circuit) that heats it to 185 F (it has an overvoltage and thermal cuto-off switch to avoid starting a fire) with the tank heating the oil for over an hour before I flip the switch (manually, I haven't rigged up a solenoid valve to automate this yet) and then pass it through three filtering stages. The filters are huge elements, they look like the ones used in big rigs. The lid of the drum has a steam valve welded into it to allow the fuel to flash off the water. After the oil is processed, it is allowed to coil. Without filtering and dewatering, it's just used vegetable oil with loads of water and inclusions of particles that don't belong in an injection pump.