> Spark ignition bio-diesel is a new one on me. Please explain. Do you
    > mix it with gasoline, and if so in what ratio?

   Didn't uncle sugar call that JP-5?
   jofarr, soddy tn

Nope,
Bio-diesel is refined from vegtable oils. It has roughly the same energy
per pound/gal as #2. No mods are neeeded to run it in cars. The fuel
does absorb water more easily than #2 diesel and it's suggested you
change the fuel filters more and run a water separator if running it in
a humid climate. This is one of those deals where the eco's want to use
recycled vegatable oils. I wouldn't suggest it for aircraft really. If
running spark-ignited heavy fuel I would certainly run Jet-A. I
suggested bio-diesel as a bit of a tease to Doug Fir. Alcohol has some
attractiveness but I can never get past the milage problem myself. I am
interested for the  RV-10 since running the 20B on heavy fuel would
probably bring it down to 230-250HP which is still enough and lower the
gals/hr in cruise...hummmm.
Bill Jepson


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