Referring you to my previous post and hoping the link works..
http://wasteoilheaterforum.com/index.php?topic=81.msg326;topicseen#newNow that this is working....
I was thinking that a good way to help improve both the burn efficency and the efficiency of heat extraction, might be to fit an 1/8" thick steel plate somewhere near the mid height of the combustion chamber (AKA the gas bottle). A steel plate of a little smaller diameter than the internal diameter of the chamber, with an hole in the centre to allow the air inlet tube to fit through, perhaps dished so the edges are higher than the centre.
The idea is to force the flame out to the metal of the gas bottle, form a secondary burn chamber at the top and perhaps introduce a separate supply of air to the secondary chamber. Since resolving my earlier problem, I notice it is now producing a small amount of smoke and I thought this modification might resolve this.
Comments welcome on the likelihood of it working, if you please.