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Reverse flow problems - Page 2

post #21 of 27
this just confirms my suspicions that a insulated firebox is definitely the way to go
post #22 of 27
Quote:
Originally Posted by urbotrimmm View Post

I would almost bet you have two big problems your vent needs to be underneath your fire and you need some way to shut your stack down so not so much heat is going out of it

 

No do not do this, it will not only cause a smoldering problem by chocking your fire but will result in temps dropping.

Quote:
Originally Posted by urbotrimmm View Post

this just confirms my suspicions that a insulated firebox is definitely the way to go

 

This will not help in getting heat through the firebox, circulation is the key, you need a good draw from the stack to pull the smoke and heat through, this refers to your first statement as well.

post #23 of 27
Quote:
Originally Posted by SQWIB View Post

 

No do not do this, it will not only cause a smoldering problem by chocking your fire but will result in temps dropping.

 

This will not help in getting heat through the firebox, circulation is the key, you need a good draw from the stack to pull the smoke and heat through, this refers to your first statement as well.

 

 YEP.... Smoking 101, you need a good convection for proper heat and smoke.  

 

 

The draw needs to start lower than the bottom of the basket and the stack needs to be unobstructed...not sure i like the 90 in the stack also. 

post #24 of 27
Quote:
Originally Posted by BHawkins View Post

Thanks Dave, I think I can handle that.I was wondering what the best way to do that was. Any specs on how big this needs to be or do I just cut the stack off the chamber and make sure it covers the existing hole, or do I make the hole in the tank a little bigger, change it to square....?

 

I did raise my coal basket above the intake and it was still running cold. I took some bar clamps and stretched them across to pull in the FB door tighter and it got up to about 275*ish. I think I am going to have to re build the FB door and make it stiffer, so I can seal it better. I was also thinking about putting in slot vents close to the bottom of the FB. Do you think I should put one on one side, one on each side, or one in the door?? My way of thinking is that if I put one on each side then they don't have to be as tall and I will have more head room for piling on the coals for long burns.

 

I don't know if I will have it by memorial day or not, but will be cooking somehow. Got two butts and three rack pack of ribs, and corn on the cob!!

B, afternoon.....   I would make the plenum about 7" tall where it attaches to the CC.... the top about 4" square... That way the hole in the CC is covered and the 3" stack will fit on top of the plenum...   Cut the hole in the CC to fit the plenum, what ever size you make it....   

 

Dave

post #25 of 27
Thread Starter 

Thanks Dave, Knew I could count on you guys. I did cut the rectangle vents down low, raised the fire grate just barely above it,(just playing with what I could find around here, will do better when I get back to work),also tweaked the flanges around the FB door to try to get a better seal. Reached 300* easily enough. I think I can work with this until I can get things really right. At least it seems that I am going in the right direction. I also think the plenum will be a great help. Gotta make some dampers for my new vents, and a better fire grate/basket. 

post #26 of 27

Sorry Squib, you are right.

post #27 of 27
Thread Starter 

Just wanted to say thanks again! I scrounged around here and found a few things that I was able to do that really helped out. I came home from work last week with a stomach virus and missed a couple of days where I just didn't care about it. Now that that is over I am looking back at the SMOKER again.(used to calling it a grill). I really do like the way the reverse flow design works. I did my two butts yesterday, and was chasing temps all day. Still have to stiffen up my FB door. It wanted to warp out from the heat and let too much air in the bottom, and too much heat out the top.I do still want to add the plenum, however I don't think the 90* bend in the stack is as big an issue as we first thought. I can achieve 300* plus right now. I stiffen and seal the FB door and I am sure it be better.Once I go back to work I can get some good angle and weld around the edges of the door to hold it straight, then I will be able to seal it off better. What I was able to do was cut in the rectangle vents down low. I found some angle that I had bent from gauge material for something else, and cut a couple of pieces and bolted then to the sides above the vents, giving myself enough room to keep the ash cleaned out from underneath, and some dampers for the vents. With the vents completely closed off I am still leaking enough air to run a little on the hot side at times.

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