GL skrev:
Isobutanol har en flampunkt på 28 grader C så det är ännu mera kallstartkänsligt än etanol som har 12 graders flampunkt. Det måste alltså finnas bensin eller annat lättflyktigt med i blandningen.
Det krävs då också något mera lättflyktigt för att inte gaserna i tanken inte ska kunna bli explosiva.
När det gäller kalstarten påstås här
http://www.ext.colostate.edu/PUBS/FARMMGT/05010.html i "Alcohol for Motor Fuels" att butanol skulle vara mindre känsligt:
Citat:
The relatively high latent heats of methyl and ethyl alcohol cause problems in mixing these alcohols with air and transporting them through the intake manifold of the engine. Heating the intake manifold may be necessary in cold weather or before the engine reaches operating temperatures. Without external heat to more completely vaporize the fuel, the engine may be difficult to start and sluggish for a considerable time after starting. Butyl alcohol is the least likely to cause starting difficulties or problems during warm-up. Note that its latent heat is almost the same as the latent heat of octane.
Men det kanske är nått för dieselmotorer ändå, kanske en blandning med rapsolja kan vara nått?
Citat:
Butyl alcohol can be mixed with diesel fuel in virtually any concentration. It does not separate as water is added or as the temperature is decreased. Further, butyl alcohol does not significantly change the cetane number of diesel fuel. In blends with diesel fuel, butyl alcohol tends to reduce the solidification temperature of the fuel at low temperatures.