![]() With smaller jets, it will be a expanded a little more. I used about a 2:1 area ratio for the diverging nozzle assuming a #56 jet. Since the flow is sonic and therefore choked, the diverging nozzle should allow further acceleration of the fuel flow and hopefully more air entrainment. On the inside, I added a 5 degree taper at the exit of the inner hole to create a diverging nozzle. He also has a set of old jets he found somewhere that have a similar design. Herb de la Porte has observed eddy currents around standard jets at the nozzle and this seems like a way to help rectify that. The idea of the transition is to smooth flow of the entrained. On the outside, the simple 3/8" hex is replaced with a smaller 5/16" hex that has a smooth taper down to the nozzle exit. ![]()
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