Hi Dies anyone know if this Optimus 100 roster burner should have a flame spreader ring? It seems to work ok without it. Cheers John
Wow @John6022 you've been around a loooong time . member longevity is huge plus fo0r the site. > yes, it definitely should have a flame spreader . thanks for posting. --------------- clarification, btw. I like your Optimus 100 (stove & ok with the title) *there's truth to that (intentional or not) Per the box (and probably per your stove) it is a [Primus Trading Co.] "Primus 100" specifically Primus 100/4128 (with it's No.4128 roarer burner) *100% manufactured at Optimus (Upplands Vasby) yet "Optimus" is no where on your stove or packaging.
It will for a while, but the ‘flame spreader’ (misnomer, as Ed has just said, it serves more as a flame restrictor) narrows the flame output to maintain vapourisation in the mixing chamber - the circular component with the crossed tubes in it. Without the flame ring and particularly in adverse conditions (cold, wind) the mixing chamber may not stay hot enough and vapourisation of the fuel begins to stop, initially with spurts of fuel-rich yellow flames culminating in liquid fuel emerging from the jet and igniting. On a warm day with no breeze you might get away with using the burner without a flame ring for long enough to boil water. John
