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Old 06-13-2009, 01:27 AM   #10 (permalink)
Christ
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
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It's in a Briggs manual I have from 1977.. (don't ask)

You basically use low-compression heads, or double stack gaskets on certain models. You use a hotter spark plug (I think hotter, maybe colder, don't have the book right now), and you add a second fuel tank... it technically still starts on gas, b/c the kerosene needs a higher cylinder temp to run efficiently, but once you've warmed up the engine, you can just flip a valve and run it on the kero tank.

Once you're done running it, you can either drain the bowl and re-fill it with gasoline, to ease the next start, or you can let it run for another minute w/ the kero shut off, then turn the gas valve back on.

Briggs says expected HP is about 15 % less, and fuel economy should increase 20-25% using clean kerosene. I figure that since Kero and Diesel share many of the same properties, I should be able to run filtered/thinned out waste oil in the engine as well, which equates to free fuel. It's easy to get used oil around here. We even have a garage heater that runs on it.
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