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

Reply
 
LinkBack Thread Tools Display Modes
  #21  
Old 01-24-2011, 05:33 PM
Tenorio74's Avatar
Laborer
 
Join Date: Jan 2011
Location: Peru
Posts: 78
Default Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

Quote:
Originally Posted by lwood View Post
also, make sure the wood is dry. Very dry. Wet wood will make it very difficult to get to pizza temp. I always put a load of wood into the oven to dry once it gets below 400 or 500 F. The wood should immediately burst into flames when put onto the fire at above 500F. If it doesn't IMMEDIATELY burst into flames, it's not dry.
Thanks for the insight. Are you referring to an air temp of 500F? I guess I'll have to bring in my home oven thermometer....

I have so far bought wood from two different suppliers... They both seem the same.

Only yesterday with the raging inferno did any wood thrown in light up fast, although they were only about 3" pieces max. I'm fluctuating between 2-3" sticks (diameter).

I'm not sure about the wood, I want to try another but I can't find any easily here, it is a bit frustrating. I'm not sure if it's not fully dry, or just the type of wood. The logs blacken and go golden coal on the outside, but don't really light up as I imagine. maybe it's wet wood, wood type or my poor technique.

I guess I'll just have to keep trying with other suppliers, or trying to find a different wood type to compare.
Reply With Quote
  #22  
Old 01-24-2011, 05:35 PM
Tenorio74's Avatar
Laborer
 
Join Date: Jan 2011
Location: Peru
Posts: 78
Default Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

I do get the chinese dragon / flamethrower effect though.... It's pretty cool hehehehehe...
Reply With Quote
  #23  
Old 01-24-2011, 07:17 PM
lwood's Avatar
Master Builder
 
Join Date: Jul 2009
Location: philippines
Posts: 642
Default Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

If they don't burst into flames immediately, I don't think they are dry. It's easy to test, either while you are firing or after for the next day. While firing and the oven is 500F or so, put some of your wood off to one side opposite of the fire. Very shortly they will start steaming if they are wet. Also you will see water coming out of the ends of the wood pieces. Wait for at least 30 min to and hour in the oven before you try throwing any of the drying wood into the fire. You should see the drying wood start to have little glowing embers on the drying wood before you toss them into the fire. They will even auto-ignite if they are dry enough, no matter what kind of wood it is. I once left them too long drying a large pile of wood and just as I first disturbed the pile of drying wood, it burst into flames and the whole oven was engulfed with flames. A little scary but I was diggin it after the first initial shock.

For the next firing, what I do is once I have finished everything for the night and the oven is down below 500F then I load the oven with as much wood as I can fit in the oven comfortably. Put the door on and leave it. So the next time I fire, the wood is nice and dry and ready to go. This make a huge difference in starting the fire and heating up the oven. You want the oven to be below 500F cause you don't want the wood burning jist drying. I find that if the oven is over 500F the wood starts smoldering and smoking and maybe burning even with the door on. My door is not that efficient. Otherwise you may have just ashes the next morning and no dry wood.

Test out the wood for dryness before you go looking for a new supplier. At least you will know the difference and maybe someone actually sells wood that is truly dry and you will know the difference.
__________________
Our Facebook Page:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #24  
Old 01-24-2011, 07:50 PM
Lburou's Avatar
Il Pizzaiolo
 
Join Date: Dec 2010
Location: DFW area, USA
Posts: 1,119
Default Autoignition temperature

Quote:
Autoignition temperature

From Wikipedia, the free encyclopedia

The autoignition temperature or kindling point of a substance is the lowest temperature at which it will spontaneously ignite in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the activation energy needed for combustion. The temperature at which a chemical will ignite decreases as the pressure increases or oxygen concentration increases. It is usually applied to a combustible fuel mixture.
Autoignition temperatures of liquid chemicals are typically measured using a 500 mL flask placed in a temperature controlled oven in accordance with the procedure described in ASTM E659.

Autoignition point of selected substances



Temperatures vary widely in the literature and should only be used as estimates. Factors which may cause variation includepartial pressure of oxygen, altitude, humidity, and amount of time required for ignition.For paper, there is considerable variation between sources. Part of this is because it takes longer for combustion to start at lower temperatures.[9]
Stating the obvious, dry wood in the oven below 450F....Paper is manufactured from wood, so has a similar autoignition point: About 450F
__________________
Lee B.
DFW area, Texas, USA

If you are thinking about building a brick oven, my advice is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Our One Meter Pompeii Oven album is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

An album showing our Thermal Breaks is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


I try to learn from my mistakes, and from yours when you give me a heads up.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #25  
Old 01-24-2011, 08:08 PM
lwood's Avatar
Master Builder
 
Join Date: Jul 2009
Location: philippines
Posts: 642
Default Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

Thanks Lburou for that. It appears my 500F wasn't too far off for drying wood.
__________________
Our Facebook Page:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #26  
Old 01-24-2011, 08:14 PM
Lburou's Avatar
Il Pizzaiolo
 
Join Date: Dec 2010
Location: DFW area, USA
Posts: 1,119
Thumbs up Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

Quote:
Originally Posted by lwood View Post
Thanks Lburou for that. It appears my 500F wasn't too far off for drying wood.
No offense intended, just dreaming of the day I'm drying wood in my own oven
__________________
Lee B.
DFW area, Texas, USA

If you are thinking about building a brick oven, my advice is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Our One Meter Pompeii Oven album is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

An album showing our Thermal Breaks is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


I try to learn from my mistakes, and from yours when you give me a heads up.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #27  
Old 01-24-2011, 08:18 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

You can fill the oven with wood at 900 degrees so long as you door it off. I generate almost 5 gallons of charcoal every burn by doing so. The charcoal works very well in my BBQ pit.

edit-I don't door it off at 900, I just door it off after the pizza is done. Most of the charcoal is generated in my ash can when I remove the coals to cook pizza.

Last edited by Tscarborough; 01-24-2011 at 08:21 PM.
Reply With Quote
  #28  
Old 01-24-2011, 09:51 PM
Lburou's Avatar
Il Pizzaiolo
 
Join Date: Dec 2010
Location: DFW area, USA
Posts: 1,119
Thumbs up Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

Quote:
Originally Posted by Tscarborough View Post
You can fill the oven with wood at 900 degrees so long as you door it off. I generate almost 5 gallons of charcoal every burn by doing so. The charcoal works very well in my BBQ pit.

edit-I don't door it off at 900, I just door it off after the pizza is done. Most of the charcoal is generated in my ash can when I remove the coals to cook pizza.
Not picking a fight here and I don't doubt that depriving the oven of oxygen does what you say, but I'd be concerned about 'flashover'....A temperature where the combustible material will flash into flame even without oxygen....Don't know what that temperature is for wood though
__________________
Lee B.
DFW area, Texas, USA

If you are thinking about building a brick oven, my advice is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Our One Meter Pompeii Oven album is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

An album showing our Thermal Breaks is
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


I try to learn from my mistakes, and from yours when you give me a heads up.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Last edited by Lburou; 01-25-2011 at 08:42 AM.
Reply With Quote
  #29  
Old 01-25-2011, 12:57 AM
lwood's Avatar
Master Builder
 
Join Date: Jul 2009
Location: philippines
Posts: 642
Default Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

Yes Lee, that's why you don't want to put the wood in the oven above the flash over temperature. It will turn to charcoal. Maybe 500F is too high for you comfort level but in my experience 500F is usually where my oven when I am finished and the wood does smolder above 500F. But below 500F it seems to be ok. So put the wood into dry at 400F, make your self feel better. The time when I had the flash-over, my oven was at about 600F.
__________________
Our Facebook Page:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #30  
Old 01-25-2011, 05:35 AM
lwood's Avatar
Master Builder
 
Join Date: Jul 2009
Location: philippines
Posts: 642
Default Re: Amount of wood to fire a 51 inch (130 cm) oven to pizza temps?

Don't get me wrong Lee, I appreciate your input and it backs-up what I am saying. But the wood will auto-ignite given the right conditions. I think the additional mass and all the other inaccuracies can explain any differences in the numbers. I admire your enthusiasm.
__________________
Our Facebook Page:
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
Why Italian Wood-Fired Ovens are Round james Newbie Forum 50 04-01-2014 10:14 PM
Tuscan and Naples designs james Pompeii Oven Construction 5 09-11-2011 05:53 PM
Pizza Variables - Wood heliman Australia 26 12-19-2010 06:18 AM
creating draft on fire in oven leff1rj Tools, Tips and Techniques 10 06-28-2010 09:38 PM
Pizza Oven on top of a wood burning chimney Texpolo007 Design Styles, Chimneys and Finish 6 02-05-2010 04:24 PM


All times are GMT -7. The time now is 11:53 PM.

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