control the temperture in reverse flow

Discussion in 'Reverse Flow' started by jeff burns, Oct 24, 2014.

  1. jeff burns

    jeff burns Newbie

    G-day Team

    Just looking for some guidance/advice on my smoker. I have tried to build it according to Feldon calculator. Still not sure i nailed it with the CC to FB opening. Anyway I have fired it up 2 x and both times if i leave the stack wide open and the FB vents wide open it reach's 300 degrees, but when I try to start to shut things down (even slightly)it drops to 200 or just below. I have a plate inside to send the heat to the left side of the smoker. Should I have holes drilled in it. Would these few things have bearing on temp control. No fire proof gasket on doors and it is quite a loose fit, my grease trap is not sealed, i find i get quite a bit of ash in the bottom of the fire box and I am sure it reduces air flow. I will attach some photo's. looking forward to reading your thoughts/suggestions.

    Thanks in advance

  2. Can you post a pic of your baffle plate and firebox vents. The opening between FB and the cook chamber looks a bit restricted, could just be the picture though. 
  3. jeff burns

    jeff burns Newbie

    Will do, but will be a couple of days as I am away.

    here are the numbers

    CC 14.5 inches diameter and is 33 inches long

    FB 11.75 diameter and 16 inches long

    Chimney is 3 inches diameter and 12.5 long (but also has that 5 inch horizontal elbow

    I have 4 x 1.125 hole drill in bottom of fire box (i will get some photo's up)

    The baffle plate lays just above the chamber opening I haven't welded it completely up the sides, but it is welded all around the round part of the tank and about 4 inches running into the tank

    I have attached my template that shows how big the opening is 4 inches high and 8.5 inches across. To be honest, i was very confused as to whether I had done this properly

    Looking forward to hearing your thoughts and thanks heaps

  4. jeff burns

    jeff burns Newbie

  5. Jeff, looking at feldons pit calculator it says you need 5.23 intake holes. So I would either make the four holes you have bigger or add a couple more. Looking at your reverse flow baffle I would make it go as far as your cooking grate and I would also cut out the firebox steel that is going into the main chamber to increase air flow. I definitely think your lack of temperature is from to much restriction of air flow and with a short baffle plate the heat is coming back to the stack to soon. I hope that I have helped. Keep us posted on your progress. 

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