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« on: May 29, 2008, 07:42:47 AM »
Veggie, List,
I run 30-40% WVO to 60-70% diesel. It mixes well. I even add the WVO after the Diesel and let driving around mix it.
The common rail Land Rover engine is a direct injection. very high pressures involved.
This is a little experiment I did a few weeks back on WVO viscosity. It was prompted by reading about adding acetone, but I now suspect that it just helps clean the injectors a little (my guess only)
Its a very simple drip test and WVO may act different under pressure but its the best I could do.
Apparatus:
1 x washing up bottle with the bottom chopped off, then invert so the little hole is at the bottom.
1 x measuring cylinder
1 x Thermometer
1 x Accurate weighing scales to help check repeatability of liquid measurement.
1 x Kitchen with wife absent at time of experiment (although she said it would have been nice to have helped)
OK I added 250ml of diesel to the washing up bottle and allowed it to drizzle out and timed how long the bottle took to empty.
I then repeated it with all of the below items. The experiment was repeated 3 times each and averaged the results.
Diesel @ 15c 30.63sec
vegoil @ 14.5c 1.05
veg oil @ 20c 49
veg oil @ 70c 33.45
new corn oil 51.31
veg oil 20% pet + 0.2 acetone 51.75
veg oil with 20%petrol 51.75
veg oil with 0.2% acetone 59.35
60% derv 40% veg 34.4 (similar time to veg at 70C)
veg oil with 20%petrol @ 70c 34.81
As you can see veg with acetone does not make much difference under normal conditions, it may have an effect under pressure. Altering the temp of the oil is the best and main factor in reducing viscosity (but I am sure we all knew that)
Adding a few blobs of washing up oil made no difference to the viscosity either.
Girls and boys, don’t heat oil especially with petrol in it unless supervised by the fire brigade and St johns ambulance.
No animal or human was hurt during these experiments.
Hope this helps someone
Stephen