Chubby Coal Temps

jjs777_fzr · Post by **jjs777_fzr** » Mon. Jan. 16, 2012 3:08 pm

Didn't want to hijack any other old threads for chubby's but...what are the temps you folks like to run at ?
I just woke up after filling up the stove and shaking/poking etc - and my intention was to revisit after 15min while the MPD and draft were wide open.
Then I fell asleep.
When I woke up I logged into my pc to check on work stuff...and of course hit my webcam that shows the temp of the basement chubby.
I thought I was seeing things when the number showed 724F.

The video below shows a nice burnpot cook'n along.

I normally cruise at 350-450 with MPD 90% shut and the draft about an 1/8th inch open.
The MPD I had to replace a few months back because the rod was all bent out of shape. The new MPD is made in china - and the holes are a bit different than the original MPD which was made in North Adams MA (Interestingly the same place the Penn Coal stove was made).
I'm sure theres a noticable operational difference between the original MPD and the replacement china model - the original had a few larger holes.

Anyways what do you folks that run Chubbys like to run them at ?

-John

Post by **Rob R.** » Mon. Jan. 16, 2012 4:20 pm

I assume you already read this thread: Coal Chubby Operating Temp?

700 is pretty high. You can do it, but it will definitely shorten the life of the grates.

DOUG · Post by **DOUG** » Mon. Jan. 16, 2012 4:31 pm

I've already run my Chubby at a constant 700 degrees without a problem. I don't have any concern with running the Chubby stove hot. It just makes for a shorter burn times burning it over 650 degrees. I found running at 650 degrees with .05 inches of draft, I can get about 8 hour burn times. The Chubby can take it and kick off some serious heat when called upon. As for the dampers, I think that the chimney's ability to draft is a bigger factor.

echos67 · Post by **echos67** » Mon. Jan. 16, 2012 4:55 pm

Wow you opened the door durring the video and it was like you had a piece of the sun in there

, good to hear the others say it no worries, that is impressive.

jjs777_fzr · Post by **jjs777_fzr** » Mon. Jan. 16, 2012 5:20 pm

Rob R. wrote:I assume you already read this thread: Coal Chubby Operating Temp?

700 is pretty high. You can do it, but it will definitely shorten the life of the grates.

thx...reading it now

coal bob · Post by **coal bob** » Mon. Jan. 16, 2012 7:22 pm

You thinks thats hot this is every day for me

I'm On Fire · Post by **I'm On Fire** » Tue. Jan. 17, 2012 8:05 am

coal bob wrote:You thinks thats hot this is every day for me

Wow! What is it that you do for a living that you get to set stuff on fire?

Post by **ONEDOLLAR** » Tue. Jan. 17, 2012 8:43 am

John

I wouldn't lose any sleep over it either. These Chubby's are like Timex watches. They can take a lickin' and they keep on tickin'. MY little Jr will cruise along at 650 no problems if I want her too and once I had her up to the 700 range. She just sat there and warmed the house up and gave me lots of fine ash in return.

BTW I cracked open the first bag of coal from our joint venture yesterday. All is well I have to say!

Ciao!
m

coal bob · Post by **coal bob** » Tue. Jan. 17, 2012 4:11 pm

I'm On Fire wrote:
coal bob wrote:You thinks thats hot this is every day for me
Wow! What is it that you do for a living that you get to set stuff on fire?

Pipe line welder. That was a 16" gas line we cut with a torch after the line was some what shut down, if its burning she aint going to blow,also keeps you warm this time of year.. And heres the end results

I'm On Fire · Post by **I'm On Fire** » Tue. Jan. 17, 2012 5:37 pm

That's insane. You're braver than I am. Stay safe.

tcalo · Post by **tcalo** » Wed. Jan. 18, 2012 7:30 pm

Just found out that the magnatic temp gauge on the side of my stove is somewhat out of whack. I bought a new magnetic temp gauge for my stack for when I burn wood. Just wanted to test the accuracy between the 2 gauges so I placed them side by side. Found the old gauge was accurate to about 400*, then it climbed pretty fast. When the temp went over 400* the old gauge seemed to be about 200* off...wow! Spring must be worn out

. Hit the stove with a laser temp gun and the new gauge is pretty accurate. I was pushing my stove to 700*, but in reality is was only burning at about 500*. The stove seemed to struggle when the outside temps dipped into the teens, happy to know she has more to give...stupid gauges

! To answer your question, I usually run my Chubby between 500*-550*. Heating a 1200 Sq.Ft. ranch, keeps it around 70*. Stay warm!

jjs777_fzr · Post by **jjs777_fzr** » Thu. Jan. 19, 2012 5:22 am

While reading Larry's literature on coal tending - I think I recall it states closing the draft all the way or at least that its possible.
Does anyone do this and if so - where is the under grate air suppose to come from if you are closing the draft ? I realize there is some air thats going to enter around the shaker handle orifice - is that it ? I also know that some over fire air will enter thru the purge holes even if they are closed (by design).
If you do run the stove for a long burn with draft intake all the way closed - what are the temps - is the fire staying lit?

On another note - I've noticed how sensitive adjusting the MPD effects the drafting ability. On one of my purge vent covers- while MPD is wide open - I adjust the purge vent to the point where its making a almost whistling noise with air - that's the air being sucked in to the stove. Just to see the effect of moving the MPD had....I noticed the slightest pitch of the MPD varies the sound of the air going thru the purge hole.
I guess what I'm saying is...I sort of use my ear to set the stove MPD in combination with the under grate intake air handle for not too much and not too little.
I think I'm caught up in this stuff...but I enjoy tinkering and trying to perfect the burn.

tcalo · Post by **tcalo** » Thu. Jan. 19, 2012 10:41 am

jjs777_fzr wrote:While reading Larry's literature on coal tending - I think I recall it states closing the draft all the way or at least that its possible.
Does anyone do this and if so - where is the under grate air suppose to come from if you are closing the draft ? I realize there is some air thats going to enter around the shaker handle orifice - is that it ? I also know that some over fire air will enter thru the purge holes even if they are closed (by design).
If you do run the stove for a long burn with draft intake all the way closed - what are the temps - is the fire staying lit?

The MPD is designed with holes in it so it allows a draft even in the fully closed position. When I burn coal I close the MPD 100% and control the fire through the ash door air intake. With the MPD 100% closed and the air intake about 1/3 open my stove runs 500*-525*. I believe with the ash door air intake fully close there is still air sneaking in, but not much. You would probably get much lower stove temps. I burn wood during the day and supplement with coal for the long overnight burn. The only time I have a problem with the fire going out is in the morning when I fail to refill the firepot. I usually add wood just before the fire goes out, but don't always catch it

! Hope this helps.

Chubby Coal Temps

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