Choosing a gas burner for a large smokehouse presents a little problem. With a venturi burner the size of the exhaust ports on the forge can mess with the tuning on the burner, as Wayne said you dont want back pressure with a venturi burner. They are relatively cheap and can eliminate a lot of the guess work of trying to tune a burner system. A venturi brush (Amazon affiliate link) How to tune up your gas grill If still have your grill’s manual then this could come in handy as a good understanding of the inner layout of your grill will be useful as you work your way through it. A good blown burner may hit welding temps at less than 1 psi, but it's dumping a huge amount of propane through an 1/8" line. Adjusting the regulator doesn't change the atmosphere. With the AOG U burner, take a wrench to loosen the screw and turn the metal air adjustment and tighten when completed.. Try tuning it at lower gas pressure 6 to 10 psi maybe. Pressure means nothing when comparing venturi versus blown. Â That measurement is not exact. You will probably be surprised at how closed the choke will be when tuning he burner at 6psi! Lynx Brass burner, it is at the bottom of the burner (right where the burner goes over the valve.To adjust the air mixture, turn the metal air adjustment clockwise or counter clockwise. I bought a venturi kit from Darren Ellis and finally got it all together and I'm tuning it now. I think I need more air, but I'm not sure how to get it. Â I'm at work now but when I get home I'll get a closer look. This document also includes a section on tuning your burner. FLARE With the help of the funnel shaped burner intake, the mirrored funnel of the flare at the burner’s tip helps to create the vacuum effect known as “venturi”. Â What you want is for the Tweco tip to create a strong vacuum entering the gas side of the main tube. If you are building your own forge, buying a pre-made venturi burner is a good way to go. Most gas burners are very short, 4 - 6" and if placed inside will provide heat by the side wall only. Â So when I say about an 1/2 inch I'm saying 1/2" distance between the tip of the tweco tip and the mouth of the gas side main tube. I havent looked at my burner for some time. I still am running a burner I bought from Art Anderson 12 years ago when I built my first forge. Let's say that on the inside your smokehouse is 36 wide, 2' deep and 6' high, a total of 36 cubic feet. Venturi burners use high pressure through a tiny orifice to work, blown burners use low pressure through a huge hole. You will not be gaining more controllability with a blown forge. A blown forge will work very well, but you will not be gaining anything over a good Venturi burner forge but complications, noise, and difficulty of tuning, although the tuning may be almost identical depending on the blown forge design. He has also gone to very large plumbing diameters, main feed of 1-1/2", and forge lead in of 3/4", to obtain as little restriction on the gas flow as possible. The flare is made from a 3″ segment of 1″pipe that slides over the end of the 3/4″ burner tube. The burner is a venturi burner with a flare on the tip. At 10psi and under it doesn't take long for 3/4's of the burner flare to get red hot. What should I be looking at in terms of tuning it? You would have 5 years ago, but not today. I'm assuming I either have not enough of the venturi effect below 10psi or I have too much back pressure at the flare. Above that psi only 1/2" of the tip is red hot. Note: ... , so this doesn't fit in the category of a venturi type burner. 'M at work now but when I built my first forge I get home 'll. Not be gaining more controllability with a blown forge built my first forge above that psi only 1/2 of! 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