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Old 02-29-2016, 05:51 PM   #1
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Veggie conversion questions.

I've read a lot of this information on the use of old fry oil. That part isn't confusing. Some people that are using fry oil for their vehicles have these complicated processing plants in their garages where the oil is not only heavily filtered, but also has chemicals added to remove the lanolin. Apparently some of you are simply filtering the oil very well and feeding it to your bus with pretty good results.

Is it simply different types of injectors and pumps that dictate how processed the oil has to be? I understood that straight fry oil would gum up your pump and injectors on a regular diesel engine.

I've got three multifuel engines that run on anything from alcohol to grease, but this type of injector pump has a fuel density compensater built into it. I'd even be afraid of gumming those engines up by burning fry oil.

Am I misunderstanding your process of preparing oil for use as fuel?
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Old 03-01-2016, 12:24 AM   #2
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No chemicals added for me. You get the oil clean enough-and warm enough it won't gum anything up. Some motors like it better than others-but no changes needed to pumps or injectors. From anything I've read on WVO sites, 5.9's are fine with it. I converted a 24 valve-but can't attest to any long term reliability. Earlier motors are better with it.
Only first hand info I can give is 7.3 Fords. They LOVE it.
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Old 03-01-2016, 01:07 AM   #3
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Mechanically controlled engines will tolerate WVO.

The increased pressures in the electronically controlled pumps and injectors in newer engines can cause some real problems if you use WVO. Even blends in excess of 10% bio-diesel can cause some real problems.
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Old 03-01-2016, 11:09 AM   #4
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Based on what I have read there is also the water issue. Seems most WVO has much higher water content that needs to be 99.99% eliminated or it will cause major issues. The article I saw a while back described serious rusting on the rings and cylinders as well as just about throughout the fuel system. I'm no veggie fuel expert so consider this a question.
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Old 03-01-2016, 01:15 PM   #5
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The next question would be how to get the water out. Oil floats on water, so maybe a drain plug in the lowest point of the WVO tank? I'm assuming heating the oil can't get rid of the water, or effectively steam it off, because of being covered by oil.

Also, I'm sure there is a certain amount of sludge from the french fries or burritos. What do you do with the unusable leftovers? I'd imagine this clogs up filters pretty fast or has someone figured a cheaper way to filter the oil?

This sounds appealing but most restaurants around here already have one individual that gets their oil. On the other hand it sure would be nice to pick up a tank of "fuel" once in while. I'm seeing complications like not wanting to give up any interior space in my medium size bus or even smelling those tanks. I'm sure there are sacrifices for some free fuel.

Gentlemen, thanks for the info. It's always enlightening.
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Old 03-01-2016, 01:25 PM   #6
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Centrifuge filters are the best.
the easiest way to get solids out is to let the WVO sit for a month or 2.
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Old 03-01-2016, 02:26 PM   #7
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BTW...the same article listed over the counter "Bio-Diesel" as having the same problem with water content (?).
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Old 03-01-2016, 03:10 PM   #8
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Wow, that is a whole bunch of new information to consider. Beyond applications on older motorcycles I wasn't aware that this type of filtering system was used.

This opens up a possibility for that old carrot juicer I've been hanging onto.

More seriously I think the black diesel option would be best if you had a 275 gallon fuel oil tank strapped in the bus, as gas station waste oil tanks are usually several hundred gallons. One good hit at a gas station could pretty much get you across the country. That's cheap even if you pay for it at a rate equal to recycling companies.

30 years ago gas stations would pay 50 cents per gallon to have waste oil removed from their holding tanks, but I don't remember anyone using it for anything more than heating oil for their shops. It's probably sold back to recyclers now, much like VO being reclaimed by the sellers at restaurants.

Thanks again. There's always something new to learn. I like this idea better than messing around with solar panels and battery banks. I found Centrifuge for Dummies at Gravity Cent. Comparison | CentrifugeForDummies.com
Seemed fitting in my case.
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Old 03-01-2016, 03:15 PM   #9
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One more option...recycling used transmission fluid. Big rig autos dump huge amounts when changed and the only thing required is filtering (10 micron I am told).
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Old 03-01-2016, 04:12 PM   #10
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Yes apparently tranny fluid is the preferred juice for fuel, and tranny fluid is actually very cleansing to your fuel system as a pint in your automotive gasoline tank cleans injectors or carburetors. There is considerable talk about mixing oils and fuels to get a better burn but that seems to be subjective to the vehicle. There are forums for specific engine models that I need to study.

Things would be so much simpler if I'd just use multifuel engine from the army truck, or better yet just use this bus body and the deuce frame so I had a 6x6 bus, I mean van. I know how to split the injector pump and make those multifuel engines go 80. Those older army 2&1/2 ton trucks got about 16 or 17 on the highway and they're set up to burn just about any petroleum product including axle grease.

That's why these buses are never finished. There's always a new angle.
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