This is a summary of all important diagrams and charts of the diploma paper that can be downloaded at http://www.biocar.de. Author is Mr. Dipl.Ing. Soyk. There are no further comments of what is shown here. If you want to know more about the evaluation of these results, maybe contact Biocar. Biocar offers a heated dual tank vegoil conversion kit that is also made for use of solid, used fats. Anything in this paper assumes a Biocar kit.




Diagram 4.6.:

cinematic viscosity of:

blue: diesel

turquoise: sesame oil

green: soybean oil

pink: Mc Donald’s used fat

yellow: take away snack shop used fat

Above: Density of various oils.

Colours are the same as in the first diagramm.


Some data on the tested vehicles and their engines:

Fist Astra is a diesel without turbo, second Astra is turbocharged and only the last one is a direct injector. The first two are whirlchamber diesels with a mechanical Bosch VE injector pump that is controlled by it‘s inner pressure in the low pressure compartment. The DI injector pump is an electronically controlled Bosch VE pump.

Above: This is something on the vegoil conversion. Charts are as follows:

Date of conversion...

Date and kilometres at the end of the tests:...

Vegoil consumption (during the whole test)...

Diesel/RME consumption (~)...

Ways: 7km to work and many longer A road and city drives ; mainly motorway ; only 38km to work daily.

The first chart above shows the developement of power of the Opel Astra 1,7d, kilometre reading: 100.000km with fresh soybeanoil. The second charts shows the developement of black smoke value both related to speeds between 50 and 140 km/h.

The next charts show single exhaust gas emissions which had been taken according to EC emission test 70/220/EWG Type I.

Picture 5.8 above shows details of the EC emission test cycle. The only difference was that there was no cold start of the engine as the concept of this dual tank conversion is based on cold starts with mineral diesel which was unimportant here.

The next diagramm shows a comparison of the engine performance (KW) with the same alternative fuels: soybeanoil, sesamoil, McDonald’s WVO, snack shop WVO, mineral diesel.

6.2.: Next one is a diagramm about the efficiency of these fuels:




Diagram 6.3.: comparison of black smoke values


6.4.: HC emissions:

6.5.: NOx in g/km:

6.6.: Co emission:

6.7.: Fuel consumption:


6.8.: comparison of HC emissions of soybeanoil at different temperatures:

6.9.: The same with NOx values:

6.10.: CO emissions at different temperatures- still of soybeanoil:

6.11.: Influence of temperature on fuel consumption of soybeanoil:

6.12: comparison of all 4 values with diesel before and after the vegoil tests:

6.14.: comparison of power- again before and after the tests:


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