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Old 11-10-2014, 08:33 AM
netboy's Avatar
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Join Date: May 2010
Location: Maryville TN
Posts: 194
Homemade conversion questions

First off I have been filtering and blending 50/50 WVO in the main tanks in my Dodge and MBs for a few years. I have a 83cd that will not start on grease but will run on it, so my plan is to two tank it by installing a plastic boat tank in the trunk for diesel and replumbing the main tank to run an aluminum line over to the exhaust and letting the exhaust warm the grease as it moves up towards the IP. Is there a problem with that idea that I haven't thought of?



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Old 11-10-2014, 09:32 AM
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Location: Ft Lauderdale FL
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Bad idea

Exhaust temp is not consistent at all and it will not work. A proper two tank conversion is not that hard and a lot cheaper than 50% diesel.
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Old 11-10-2014, 09:46 AM
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Location: MN
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Exhaust heat is highly variable. It is not a good idea. It will be too hot, or, too cold, it will rarely be just right.

Use coolant for heat, it is just right.

Do this: 1991 350 SDL Conversion to WVO

In your southern location, you may be able to get by without the flat plate heat exchanger.
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Old 11-10-2014, 10:44 AM
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Join Date: Sep 2010
Location: 2021 - The Great Florida Count-down
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x3. You cannot "control" exhaust temps which means you cannot control the transfer of heat to the WVO. With coolant heat transfer, you know you will never get over 180-ish. It is brutually hot in S.C., but I still advocate a 2 tank system. I ran 1 tank for over a year and never an issue, but 2 tanks is the safest route IMO.
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Old 11-10-2014, 12:01 PM
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lied to for years
Join Date: Nov 2008
Location: Elizabethton, TN
Posts: 6,254
I used a boat tank for my diesel,fattywagons wires to heat it,and heatexchanger.The wires I made a thermstat to turn off heaters,when heatexchanger was hot.I had manual valves.But I did a mistake by using main tank for 50/50 mix.The animals proteins ( the dreaded chicken skin ) took two years to clear from tank.
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Old 11-10-2014, 12:22 PM
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Join Date: Mar 2008
Location: Buffalo NY
Posts: 2,057
I heard it discussed, but I've never heard of it being done. I think people worry about getting the grease line too hot. Two tank systems I hear of are generally, coolant heated or electrically heated, or both. Both of these systems benefit from a thermostat- coolant temp is regulated by the engine thermostat and the electric heaters can be made from Positive temperature coefficient (PTC) elements that self-regulate to a specified temperature.

User GregMN has a link to his sharp coolant heated design somewhere.
Fattywagon (no relation) sells line heaters.

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Old 12-02-2014, 01:49 PM
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lied to for years
Join Date: Nov 2008
Location: Elizabethton, TN
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make that 2.5 and still having problems with chicken skin.I had tank off and cleaned,with cleaning solvent.When I have time I will use old tank as a mold,and make me a fiberglass main tank.Grease was fun until the rendering company got tight with the health department,and forced all eateries to use a render service.Thhey claim it keeps down the rat,population.

1999 w140, quit voting to old, and to old to fight, a god damned veteran
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