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ncsmoker 01-06-2014 02:05 PM

How long does your oven stay hot?
 
As the title implies, I'm curious to see how long and how hot your oven stays after firing. I have a Casa2G90, and added extra insulation both above and below. I also made an insulated door for my oven. Yesterday we cooked pizza and closed her down around 8pm or so. At 330pm this afternoon, the oven was right at 450, so we decided to throw a few loaves of bread in. Temps here in NC today were in the 30's to 40's. Most times, next morning the temp is right at 375-500 somewhere. Not sure why I get such a discrepancy. Firing times tend to be around the same, 2-3 hrs.

I've gotten almost 3 days of use before, where the temp on the last morning is around 200 and perfect for granola, fruit roll ups or jerky.

What are your typical times and temps?


My build
http://www.fornobravo.com/forum/f6/d...ild-20119.html

Les 01-06-2014 05:16 PM

Re: How long does your oven stay hot?
 
I posted the following around 5 years ago for the record.

Saturday at 6:30 PM after the fire; hearth=900 deg.
Saturday at 8:00 PM after pizzas; hearth=555 deg.
Sunday at 9:00 AM hearth=447 deg. - cooked a coffee cake
Sunday at 4:30 PM hearth=374 deg. - cooked coconut shrimp
Monday at 6:30 AM hearth=288 deg.
Monday at 4:45 PM hearth=244 deg.
Tuesday at 4:45 PM hearth=170 deg.

ncsmoker 01-06-2014 05:28 PM

Re: How long does your oven stay hot?
 
Thanks Les, do you remember how long you fired the oven for prior to cooking pizza?

I ask because I can fire mine for 90 minutes and get it up to temp, but the heat lasts nowhere near as long as when I let it go for 3 hours or longer.

Les 01-06-2014 05:49 PM

Re: How long does your oven stay hot?
 
I usually plan on three hours. I do not have a raging fire, I would say its a moderate burn. When the carbon has cleared to about 4 inches above the hearth I let the fire get a lot smaller.

wotavidone 01-06-2014 11:10 PM

Re: How long does your oven stay hot?
 
Mine doesn't stay hot long. Best I have seen 12 hours after a pizza night is about 300 degrees F.
I suppose I should really get around to making a nice close fitting insulated door.
I guess thin stainless steel sheet is really not much use for holing the heat.
When you fire it quick (60-90 mins), the bricks don't really saturate. The surface is hot but there is still capacity to pump more heat into the brick.

ncsmoker 01-07-2014 06:22 AM

Re: How long does your oven stay hot?
 
After building my insulated door, I am seeing a difference of about 50 degrees between that and the thin metal door. I honestly thought it would have been more of a difference.

Tscarborough 01-07-2014 07:02 AM

Re: How long does your oven stay hot?
 
After a full saturation burn, it goes about like this:

Doored after pizza, 850-900
24 hours 550
48 hours 350
72 hours 200
96 hours 150
120-168 hours ambient

ncsmoker 01-07-2014 03:22 PM

Re: How long does your oven stay hot?
 
48 hours after cooking pizza, we are at 200 degrees. It's usually a little better than this...might have something to do with the fact that it's 15 degrees outside!

oasiscdm 01-08-2014 03:31 PM

Re: How long does your oven stay hot?
 
A wise man once told me and we all know him [KD]. That once oven is fired and maintained for at least 3 hours for complete saturation of the mass then doored. Allow 90 minutes for complete saturation. What becomes important then is air temperature. My thermocouples after doing this all read the same as the air temperature.

Quote:

Originally Posted by wotavidone (Post 167786)
Mine doesn't stay hot long. Best I have seen 12 hours after a pizza night is about 300 degrees F.

I suppose I should really get around to making a nice close fitting insulated door.
I guess thin stainless steel sheet is really not much use for holing the heat.

Maybe check out my door when I get photos up I am using stainless steel throughout my door but isolating the internal SS from the external. My door will be 5" thick though heavier around the handles lighter inside the oven. eg.. from inside out SS/Calsil/SS/Hebel/SS/Handles............

david s 01-09-2014 12:10 AM

Re: How long does your oven stay hot?
 
For the door it is not just how well insulated it is in regards to performance, but also how well it seals. Think of a normal domestic oven with a faulty door seal, won't hold temperature. This is another whole can of worms because as the inner oven parts are moving all the time it affects the seal. Sometimes I have to wedge a tiny slither of wood under the bottom edge of my door to create a good seal, other times not. Italians had a good trick to help seal their ovens by using wet newspaper jammed in around the sides and the top. Not too pretty, but very effective.


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