Flow problems with my custom build smoker

Discussion in 'Smoker Builds' started by metaldoctor21, Sep 27, 2013.

  1. sqwib

    sqwib Smoking Guru OTBS Member

    I thought so!

    Seems like your drafting from the inlet... I think you will see an improvement with the fire grate above the inlet hole
     
  2. sqwib

    sqwib Smoking Guru OTBS Member

    I would not modify anything just yet.
     
  3. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    I see the problem with the calculations....  With a firebox at 241% of recommended, and all the rest of the calculations based on the firebox, the calculations think the cook chamber is 241% bigger than it actually is......    

    Dave
     
  4. metaldoctor21

    metaldoctor21 Fire Starter

    Fire box side of cooking chamber
     
    Last edited: Sep 29, 2013
  5. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

     
  6. metaldoctor21

    metaldoctor21 Fire Starter

    If I try to use any type of tuning plate it really kills off any flow I have and I can't get the other end of the smoker to get any heat.
     
  7. metaldoctor21

    metaldoctor21 Fire Starter

    I tried running the pit with the grate completely above the inlet and it still didn't seem to change much. I still have a lot of heat at the fire box end about 450-500 degrees at one point and I struggled to get up to 200-225 degrees at the other end. It took me at least an hour to get 200-225 degrees at the exhaust end. I did have to raise the grate up pretty high in the fire box to get above the inlet. I am not sure if that would effect anything.
     
    Last edited: Sep 28, 2013
  8. metaldoctor21

    metaldoctor21 Fire Starter

    Running with fire box door cracked open and grate raise
     
    Last edited: Sep 29, 2013
  9. metaldoctor21

    metaldoctor21 Fire Starter

    Fire box door cracked open with grate raised
     
    Last edited: Sep 29, 2013
  10. metaldoctor21

    metaldoctor21 Fire Starter

    Fire box door cracked open and grate raised
     
    Last edited: Sep 29, 2013
  11. metaldoctor21

    metaldoctor21 Fire Starter

    Grate Raised
     
    Last edited: Sep 29, 2013
  12. metaldoctor21

    metaldoctor21 Fire Starter

    Grate Raised
     
    Last edited: Sep 29, 2013
  13. metaldoctor21

    metaldoctor21 Fire Starter


    So do I need to change something to get the correct calculates for the actual size of my pit?
     
  14. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    Post #9 has the calculations for the CC size, I think...  I can't get feldon's to open this morning.....  I wouldn't change any thing on your smoker except......  Move the stack over the FB.... Install a RF plate...  then install a choke plate on top of the stack because it is over sized...

    That would be the simple, easy way to make a great smoker....    

    Before any of that is done, Check with SQWIB and Ribwizzard for their input....   I could be off base here... 3 opinions are better than one especially considering the work involved....

    Since the smoker you have is an assembly of several different styles, I would go with a more conventional style....  Ignore the numbers.... this drawing was for jmud....  And some theory has improved upon this design, since it was drawn...   Dave

     
  15. metaldoctor21

    metaldoctor21 Fire Starter

    If my inlet hole, fire box to cooking chamber, and exhaust stack are all to large would this cause me to draw to much. Thus losing all my heat at the other end. I have a 3" stack 24" long that I can bolt on. I can close the internal damper from the fire box to cooking chamber down some. Then block off part of my inlet hole. I did notice when I ran my pit last night with the charcoal grate above the inlet hole that my exhaust stack got so hot that I could hardly touch it. I did close my fire box to cooker damper down and was able to get my pit within 50 degrees end to end, but it was a struggle to get the exhaust end up to 225 degrees. I also adjusted the damper on my stack from full open to almost closed and anywhere in between, but it didn't seem to bring the heat up on that end any.
     
    Last edited: Sep 28, 2013
  16. sqwib

    sqwib Smoking Guru OTBS Member

    I'm camping right now but when I get back I'm going to go over everything again. I would say no you do not have proper draft because smoke is coming out of the Inlet. The draft would literally pull the flame. You can also look into a deflector plate.
    I'll check Monday.

     
  17. With the grate raised in the firebox, and tuning plates removed does it work and draw properly. If still having problems I would do what Dave suggested and convert to a Reverse Flow.

    If the tuning plates are removed I don't see why it would not draw correctly ?

    Gary
     
  18. metaldoctor21

    metaldoctor21 Fire Starter

    Finished Product

     
    Last edited: Sep 29, 2013
  19. sqwib

    sqwib Smoking Guru OTBS Member

    Does that mean everything is working fine?
     
  20. metaldoctor21

    metaldoctor21 Fire Starter

    No still having the same issue we have been talking about. That is just the picture of what it looks like all painted.
     

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