Menar du etanol utan bensin eller E85?
http://alternativefuels10.tpub.com/henn ... in0010.htmCitat:
The cetane number, also found in Table 1, is a measure of the ease (or difficulty) by which a fuelcan be compression ignited. Fuels with high cetane numbers have low autoignition temperaturesand short ignition delay times. Ethanol has a low cetane number, less than 5, compared to 40 to 55 for diesel fuel. This indicates that the alcohol fuels have higher autoignition temperaturesrelative to diesel fuel. This is reflected in the autoignition temperatures of ~600 degrees F fordiesel fuel and 793 degrees F for ethanol. Hence, the requirement of glow plugs to autoignite the E95 fuel in the 6V-92TA engines.
Table 1 finns här
http://alternativefuels10.tpub.com/henn ... in0011.htmoch här kan man läsa vad som kan behövas i en dieselmotor:
http://en.wikipedia.org/wiki/Cetane_numberCitat:
Typical values
Generally, diesel engines operate well with a CN from 40 to 55. Fuels with higher cetane number have shorter ignition delays, providing more time for the fuel combustion process to be completed. Hence, higher speed diesel engines operate more effectively with higher cetane number fuels.
In Europe, diesel cetane numbers were set at a minimum of 38 in 1994 and 40 in 2000. The current standard for diesel sold in European Union, Iceland, Norway and Switzerland is set in EN 590, with a minimum cetane index of 46 and a minimum cetane number of 51. Premium diesel fuel can have a cetane number as high as 60.[2]
Om man blandar etanol med eter (dietyleter) med cetantal över 125 enligt tabellen borde det funka. Det intressanta är att man tydligen kan generera dietyleter ur etanol med värme svavelsyra som katalysator. Man kanske skulle kunna ha en eter generator ombord som använder motor/avgasvärmen, då har man även löst kallstartsproblem med E100 i ottomotorer.