This blend would most likely work very well. This blend wouldn't work in a normal cascade though, but in autocascade it's very doable. Big Sturl, may i recommend you reading
mytekcontrols thread, there he writes about pseudo-refrigerants, absorbtion of one refrigerant in another, etc. etc. which is vital to the understanding of this multiple evaporation unit.
I sincerely recommend you to first build a simple single-stage phase change cooler, we have all started like this. This is asking for trouble, especially with highly flammable R600 & R170 in the mix. You will most likely fail with this build. Sorry if this sounds harsh but that's the reality. Even the most skilled builders on this forums haven't really build one with much success. Besides, have you seen the price for a couple of kilos of R-14?
Be smart and don't rush to kill yourself
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