Venturi

Burner is 1/8" brass tube for gas flow. It goes through a 1.5" × 3/4" bell reducer to a 12"×3/4" pipe and another 1.5inch reducer for the nozzle. I drilled out a 1/16 inch hole for gas flow and not a #57 . this is most likley my problem. Perhaps the gas flow is too great and pushing away my flame in the forge? I would've bought a smaller bit but I'm so poor I owe the bank $... thanks for the reply frozen. forgot to mention I'm using a high pressure regulator from tractor supply. no real measurement of psi

Hey I made a simple Ron reil type torch. It runs fine outside of my $350 furnace I just built but when inside it can only operate at lower psi. Upon observation I see the flame gradually leaving the torch nozzle then shooting back untill it shoots away one last time and goes out. I feel like this has to do with either my intake or exaughst. Can post pics of desired.