Got this 1320 up and running on pure alcohol (as supposed to). No date code at all underneath the fount?? (Wish I could find/swap a Primus Globe for it in 122mm x 122mm)
@Harder Sorensen A question about fuel consumption, Harder. Is it noticeably worse using alcohol because of the larger jet orifice, maybe requiring more frequent re-pressurising during a session as the fuel depletes more quickly than with kero? John
@presscall In my opinion - yes. I recall last time, when I had a 1320 - I was surprised how fast it would spend fuel compared to its brother - the 1020. Pump-wise - a bit more often as the 1020, but that is my best guess, as a comparison would demand a test with the 1020 being pumped the same amount of strokes and the same amount of fuel i both founts - which I haven’t done - yet…
I suppose it illustrates - historically speaking - that it scored over its kerosene stablemate when alcohol was more readily available than kero.
@presscall The fuel consumption is noticeably higher with the alcohol version. There is still enough for a good night of burning, but it needs to be filled up each day. This all relates to the size of the jets. For a 1020, the jet is about 0.2 mm. This gives an area of 0.31 mm^2. For the 1320 the jet is 0.3 mm, giving an area of 0.71 mm^2. At the same pressure, this should give more than twice the consumption. The advantage is that alcohol usually doesn't need as high a pressure. At best, I have had up to 2/3 burn time with alcohol.
I’ve only had experience of alcohol-fuelled pressure stoves, where even with the larger jet orifice compared to the kerosene-fuelled equivalent, not only is the fuel consumption greater but the burner puts out less heat because of the lower calorific value of the fuel. Whereas extended boiling times for a stove fuelled on alcohol are noticeable compared with a kerosene-fuelled burner of the same type at a given tank pressure, the illumination of a mantle evidently isn’t when tank pressure is reduced. Makes sense, given the nature on mantle incandescence.