losing heat in stack

[dblact38]

I have two home made evaporators a 55gal barrel and a 36x20x24 box I made with a 6" stacks on both. The stacks both 90 out from the back of the evaporators 2 inches from the top. My question is should I lower the stacks a couple of inches so that the heat does not escape fast and gets trap where the pans are or will I kill my draft or make things worse and by the way I get a lot of smoke coming out thru my door my stack are 6 feet tall Thanks any advice would help

[maple flats]

Lower it 2" out the back and then if needed add 2' more height for more draft.

[wmick]

just a guess.... but if you have smoke coming out the door, you are likely not losing a ton of heat up the stack... or it would be drawing more.
Sounds like you might want more heat in the stack... or like mentioned.... taller stack.

I'm certainly no expert,.. but the evaporators I've been looking at pretty much all stack from the back top of the evaporator... and most of the attention is given to "forcing" the heat to travel very close to the pan on its way to the stack.

[dblact38]

Thanks guys I will try to drop it 2 inches and also add another section of stack

[Wannabe]

Not trying to disagree with MF but maybe just try adding the section of stack first before you drop the exit. Keep that fire as close to the pans as you can. My barrel rig (275 gal. fuel barrel) really pulled more draft once I added more height, only smokes a very little out the door at start up and then nothing.

[dblact38]

ok thanks Wannabe ill try that on a practice run this summer