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Exhaust Diameter

Posted: Tue Mar 20, 2018 10:52 am
by Motoclay
So I have a Texas Original smoker from Bucees....super badass, thick steel, heavy duty, has all the fire plates and all that.....problem is...I struggle keeping the fire rolling well....fire box door can be wide open, exhaust wide open, good bed of coals and a log or two burning and it just doesn’t seem to do all that well. Now, I can crack the main door open just a hair and the temps rip out of control and the fire starts raging....so here is my thought....it has a 2 3/8” piece of pipe for exhaust...I AE a lot of pits with 4”-6” pipe. I’m wondering if I increase the diameter of the exhaust if it would help it breath better and the of course if it’s too much I’d have a damper to slow it down....makes sense to me, but am I wrong as far as the pipe just isn’t big enough?

Opinions....??

Re: Exhaust Diameter

Posted: Tue Mar 20, 2018 12:28 pm
by Rambo
There are some smart pit guys here; someone will answer, not me

Re: Exhaust Diameter

Posted: Tue Mar 20, 2018 5:58 pm
by slamkeys
Maybe it needs to be longer. Plug your dimensions into the Feldon calculator to see what it recommends: http://feldoncentral.com/bbqcalculator.html

Re: Exhaust Diameter

Posted: Tue Mar 20, 2018 6:03 pm
by Red Farr
...I use 6" pipe with my vertical...and 2 reducers depending on the time of year...a 5 inch and 4 inch....in the summer 6 inch dead of winter 4 inch...in winter the 4 draws same as 6 in summer..easier fire mgmt...the exhaust pipe is insulated .

Red

Re: Exhaust Diameter

Posted: Tue Mar 20, 2018 6:31 pm
by Swamp Donkeyz BBQ
Kevin can probably give you the best advice.

Sent from my SAMSUNG-SM-N920A using Tapatalk

Re: Exhaust Diameter

Posted: Tue Mar 20, 2018 11:53 pm
by Motoclay
Super big help
Slam keys!!! Thanks!

Re: Exhaust Diameter

Posted: Fri Mar 23, 2018 6:04 am
by k.a.m.
Motoclay wrote:So I have a Texas Original smoker from Bucees....super badass, thick steel, heavy duty, has all the fire plates and all that.....problem is...I struggle keeping the fire rolling well....fire box door can be wide open, exhaust wide open, good bed of coals and a log or two burning and it just doesn’t seem to do all that well. Now, I can crack the main door open just a hair and the temps rip out of control and the fire starts raging....so here is my thought....it has a 2 3/8” piece of pipe for exhaust...I AE a lot of pits with 4”-6” pipe. I’m wondering if I increase the diameter of the exhaust if it would help it breath better and the of course if it’s too much I’d have a damper to slow it down....makes sense to me, but am I wrong as far as the pipe just isn’t big enough?

Opinions....??

You are on the correct path by increasing your exhaust diameter. Increasing the length of an already too small diameter will only increase the problem. What is the dimensions of the cooking chamber and firebox?

Re: Exhaust Diameter

Posted: Sat Mar 24, 2018 11:08 am
by Motoclay
20x40 cook chamber and 20x20 firebox

It’s basically the Yoder Whichita.....

All 1/4” thick, super heavy duty....I rebuilt the fire grate in the fire box using 3/8 rebar to get it up off the bottom so the air can draft through from the bottom....

The reason I lean towards making it bigger, when I crack the big lid and prop it open with a small stick, fire rips and temps sore....

Re: Exhaust Diameter

Posted: Sun Mar 25, 2018 7:01 am
by freddie987
Red Farr wrote:...I use 6" pipe with my vertical...and 2 reducers depending on the time of year...a 5 inch and 4 inch....in the summer 6 inch dead of winter 4 inch...in winter the 4 draws same as 6 in summer..easier fire mgmt...the exhaust pipe is insulated .

Red




Do you have photos of your insulated exhaust? How is it insulated?

Re: Exhaust Diameter

Posted: Sun Mar 25, 2018 6:28 pm
by k.a.m.
I would use a 4" ID exhaust 24" tall.

Re: Exhaust Diameter

Posted: Wed Mar 28, 2018 7:46 am
by Chasdev
I've noticed that Franklin's pits don't use a fire grate at all..the fire rests on the bed of coals.
When I experimented with grate vs coal bed my fires were more controllable without the grate.
Harder to get up to temp but I can run with the door wide open and control heat with the amount of new fuel once the coal/ash bed is built up.

Re: Exhaust Diameter

Posted: Tue May 29, 2018 9:08 pm
by Bitsbeardo
I have a lyfe tyme 20x40 w/20x20 firebox. Exhaust is 4.5”x 23”, pulls pretty well. Installed a piece of 18g sheet metal between firebox and cooking chamber to slow the fire/draw. Opening is football shaped and approx 5” at widest point. Removed grate at bottom of firebox and maintain solid coal bed for small 6-8” oak splits. Preheat splits on top of firebox or to side of fire in firebox. I run with both the exhaust and firebox door wide open. Easier to maintain/steady temp with just uniform splits and coal bed. Less is more.