Go Back   Forno Bravo Forum: The Wood-Fired Oven Community > Oven Management > Firing Your Oven

Like Tree2Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-12-2013, 04:52 AM
Filthymutt's Avatar
Apprentice
 
Join Date: May 2010
Location: Beijing, China
Posts: 176
Default What is wrong??

Ok, Curing fires are done. Are done. Its ten days since I closed my dome and I'd lit several small fires during the process, ALL WITHOUT INSULATION to check for cracks/leaks, etc.

So I had a fire going at 625C (1150F) today. Oven is not going white, and things aren't that hot. What I mean is I measured the temp of the bricks a foot away from the edge of the fire and they are only hitting 75C ! The wones 1/2 a foot away are hitting maybe 125C. Even the top of the dome is only 3-400C

So, whats up? Am I measuring the heat of the fire wrong? Cause it was not a scary fire as I've heard the term bantered about. I used the laser thermometer and got that temp from the center bottom of the burn.

Is the heat not spreading because of lack of insulation? Shouldn't be because I felt the outside of the dome with my hands, in many different spots and it wasn't hot or even warm an hour into the burn.

I'd about 3 logs going. What is wrong? I need to burn like 6 or 7 big pieces of wood or what?

Thanks all.

Frustrated Bob
__________________
Bob

Always ready for pizza


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #2  
Old 09-12-2013, 05:30 AM
stonecutter's Avatar
Il Pizzaiolo
 
Join Date: Jun 2007
Location: South Carolina,USA
Posts: 1,891
Default Re: What is wrong??

Quote:
Originally Posted by Filthymutt View Post
Ok, Curing fires are done. Are done. Its ten days since I closed my dome and I'd lit several small fires during the process, ALL WITHOUT INSULATION to check for cracks/leaks, etc.

So I had a fire going at 625C (1150F) today. Oven is not going white, and things aren't that hot. What I mean is I measured the temp of the bricks a foot away from the edge of the fire and they are only hitting 75C ! The wones 1/2 a foot away are hitting maybe 125C. Even the top of the dome is only 3-400C

So, whats up? Am I measuring the heat of the fire wrong? Cause it was not a scary fire as I've heard the term bantered about. I used the laser thermometer and got that temp from the center bottom of the burn.

Is the heat not spreading because of lack of insulation? Shouldn't be because I felt the outside of the dome with my hands, in many different spots and it wasn't hot or even warm an hour into the burn.

I'd about 3 logs going. What is wrong? I need to burn like 6 or 7 big pieces of wood or what?

Thanks all.

Frustrated Bob
How long was the fire going when you felt it with your hand? Is there cladding on the oven? Are you sure that it is cured? Is the oven protected by the weather?

If anything, insulation help distribute the heat within the masonry a lot faster. It sounds like you still have a wet oven .
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Current WFO build -
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


When we build, let us think that we build for ever.
John Ruskin

Last edited by stonecutter; 09-13-2013 at 03:27 AM. Reason: sp
Reply With Quote
  #3  
Old 09-12-2013, 05:36 AM
Apprentice
 
Join Date: Aug 2012
Location: Arkansas river valley
Posts: 137
Default Re: What is wrong??

Don't know what kind of wood you are using, or how long the fire is burning, but, I use 7-8 pieces of dry oak,12-16", from wrist to bicept size and a handfull of kindling. It will take about 1-1 1/2 hrs to get to white in a 39" insulated oven..I think that you need more wood...if your dome is dry. I would insulate, soon. Really hot fire in a uninsulated dome will get the top hotter, much hotter than the rest....insulation will "temper" the heat and help to distribute, unifiy the heat minimizing temp. differences......and cracking... And what Stonecutter said above...it may still be wet....the insulation will help move the heat and drive out the moisture...
__________________
" Life is art, live a masterpiece"

Last edited by thickstrings; 09-12-2013 at 06:00 AM.
Reply With Quote
  #4  
Old 09-12-2013, 06:54 AM
boerwarrior's Avatar
Journeyman
 
Join Date: Apr 2013
Location: Santa Rosa, CA
Posts: 448
Default Re: What is wrong??

when you say the fire is at 625C (1150F) where are you measuring that?

If you are pointing your heat gun at the coals then that is not a very hot fire. When my fire is burning I can get the roof of the dome up to 1100 degrees F and my heat gun (which maxes at 1400 degrees F) cannot measure the heat of the coals...
Reply With Quote
  #5  
Old 09-12-2013, 09:12 AM
deejayoh's Avatar
Il Pizzaiolo
 
Join Date: Jul 2010
Location: Seattle
Posts: 1,380
Default Re: What is wrong??

takes 90-120 minutes for a cured oven to clear. Your new oven will take longer and probably more wood. Just keep stoking the fire. And 3 logs is not many. My 39" takes 4-5 logs going to clear
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #6  
Old 09-12-2013, 04:42 PM
Filthymutt's Avatar
Apprentice
 
Join Date: May 2010
Location: Beijing, China
Posts: 176
Default Re: What is wrong??

Thanks all, Yup, once I get the enclosure done and insulation in (can't get a blanket here gong to fill the enclosure with loose vermiculite) then I will go much hotter.
I was measuring at the coals 625C after 3 pieces of wood.
And was not waiting long enough.
Impatience, is always my downfall

I'll burn today but I won't try going too hot until the insulation is all in.
miltcook likes this.
__________________
Bob

Always ready for pizza


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #7  
Old 09-12-2013, 05:48 PM
mrchipster's Avatar
Il Pizzaiolo
 
Join Date: Apr 2010
Location: Minneapolis, MN USA
Posts: 1,260
Default Re: What is wrong??

Measuring the temp of the coals will always give you a high reading it has nothing to do with the brick.temps,
__________________
Chip
Reply With Quote
  #8  
Old 09-12-2013, 06:35 PM
Les's Avatar
Les Les is offline
Il Pizzaiolo
 
Join Date: Sep 2005
Location: Carson City, NV
Posts: 2,852
Default Re: What is wrong??

Quote:
Originally Posted by Filthymutt View Post

Is the heat not spreading because of lack of insulation?
The heat isn't spreading because fire brick is a crapy conductor of heat. You can get the oven incredibly hot without the insulation, it just won't retain the heat. BTW, 3 pieces of wood is weak. Get that sucker going with the fires of hell - flames jumping out the top and the entry (very cool to watch).
brickie in oz likes this.
__________________
Check out my pictures here:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


If at first you don't succeed... Skydiving isn't for you.
Reply With Quote
  #9  
Old 09-12-2013, 11:27 PM
brickie in oz's Avatar
Il Pizzaiolo
 
Join Date: Mar 2009
Location: Whittlesea
Posts: 3,455
Default Re: What is wrong??

Quote:
Originally Posted by Les View Post
BTW, 3 pieces of wood is weak. Get that sucker going with the fires of hell - flames jumping out the top and the entry (very cool to watch).
Thats the way......

Sounds like the oven is still wet.
__________________
The English language was invented by people who couldnt spell.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #10  
Old 09-21-2013, 09:39 AM
Filthymutt's Avatar
Apprentice
 
Join Date: May 2010
Location: Beijing, China
Posts: 176
Default Re: What is wrong??

Success! Finally got hold of Calcium Silicate blanket and went overkill on it with 150 sq.ft. worth. Fired up the oven at least a dozen logs worth. Cleared the dome! But I'm still wondering about temps. The heart of the fire, in the coals is only about 630C (1166F) and my hearth bricks adjacent to the fire top out at 300C (572F).
Is that as high as it should get?
I burned and kept it stoked for four hours. Closed the door on the coals about 9:00pm. This morning made Blueberry muffins in there. Closed the door again and reheated leftover pizza tonight 26 hours after the original firing without a relight. Amazing heat retention.

Bob
__________________
Bob

Always ready for pizza


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Were doing it all wrong brickie in oz Tools, Tips and Techniques 5 04-26-2011 06:36 PM
Escali scale measuring wrong weight Wiley Chit Chat 11 12-27-2010 04:58 PM
My oven was wrong. zilli Getting Started 5 08-12-2009 02:41 PM
Help I used the wrong castable....suggestions? Bill1 Getting Started 14 04-29-2009 05:58 PM
did i use the wrong mix mini Getting Started 4 04-23-2009 04:40 AM


All times are GMT -7. The time now is 12:20 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC