Converting to use BIODIESEL

[annodomini2]

ELAN+2 said:

According to Bosch, PD engines are not biodiesel tolerant, its down to viscosity, in that bio has longer molecule chains and the design of the injectors (5 micron fuel filtration in the injector body) and the injector and lift pumps need the lubrication properties of regular diesel. They will however tolerate the blended bio/fossil fuel thats for sale currently...... I've used veg oil in an old volvo without problems, infact quite the reverse, however modern high pressure systems (common rail and PD) are a different kettle of fish.

Viscosity is non-linearly proportional to temperature, above 20-30degC the Biodiesel will be thin enough, there are systems out there that are supposed to deal with this such as two tank, and heaters.

The problem will not be the filter, but the effective flow rate due to the higher viscosity.

[EwenMc]

I'm not sure you're confusing biodiesel with straight vegetable oil? Straight veg oil (triacylglycerides - 57 carbon atoms or so) is certainly more viscous than dino-diesel. Biodiesel is generally FAME (fatty acid methyl esters - derived from triacylglycerides - 19 carbons or so) and has similar viscosity to dino-diesel.

[EwenMc]

ELAN+2: Where did you get the Bosch information?