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pizza oven powered by rocket stove

 
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reaching 900 F at 30 mins on the pizza stone.  
Sadly I had no experience with this type of temperature which is more appropriate for Neopolitan style pizzas.
 
Graham Chiu
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After a couple of goes using this pizza box oven, I'm still burning the bottom of the pizza so I suspect it's getting too hot compared with the rest of the oven.

I might try putting in another pizza stone on top of the existing one, and if that doesn't work, try a heat diffuser below it.

I think I'm using a 5" batch box to burn my pizzas!
 
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Graham you'd better get this fixed right away because burning pizza can earn you some pretty bad karma in no time!

Raising the oven a few bricks higher wouldn't help?
 
Graham Chiu
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I don't think so Gerry because these things are supposed to sit right on top of a gas BBQ, and that high up the heat is not likely to get inside the oven.

I might try another pizza stone just sitting on top, or, held apart by a small spacer to create an air gap.
 
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How is the heat transferred to above the pizza?
 
Graham Chiu
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There are holes all around the side of the pizza stone so it enters that way.
The inbuilt thermometer is on the roof of the box.
 
Rebecca Norman
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Hmm, then that sounds like there will have to be way too much heat below before there's enough heat above. Pizza needs substantial heat from above, and I can't imagine how that set-up would get enough heat above it without being far too hot underneath. I've tried jerry-rigged versions of this before, and always had the problem you're having. But the box you're using is sold commercially as supposedly working fine over a gas grill, right? So then I'm mystified why it would work over a gas grill. Have you looked at reviews of the item and seen if a significant number of people are actually using it successfully for pizza over a bottom-heat source?
 
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I use a DIY version of this on my gas grill.
Mine has firebricks sitting on the heat shields directly.
That puts them inches below the grill surface.
The pizza goes on the grill surface in a perforated steel pans.

To cook the top of the pizza, I place bricks in a three sided "U" shape,  on the grill surface.
The bricks are laid on their flat side.
On top of this I place a tray filled with more firebrick.

With this in place, I light the grill and crank it all the way up.
After 15 minutes the "pizza oven" is ready.

The thermal mass is less than an inch from the top of the pizza, but 2 or 3 inches from the bottom of the pizza.
In this way the thermal mass redistributes and evens out the heat.
Bakes great pizza, perfectly even top and bottom,  but half my family dislike the "grilled" taste, the cretins!

Based on all of that,  I think adding a huge chunk of thermal mass between the rocket exhaust and the bottom of the pizza will slow, spread and store  the heat.
If there isn't a chunk of steel or ceramic in the roof of the oven,  it might not be enough.



 
Graham Chiu
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Rebecca, I don't see any reports of my issue with this type of oven over a gas grill.  So, how can a 5" batch box be hotter than 3 burners on a gas grill?

William, I'd like to see your setup.  The original Bakerstone pizza box has stone on the floor, roof, and sides.  There's only a thin gap at the rear which lets the heat in but I presume that the floor of the box is also heated by gas.

I'm going to try a commercial pizza dough to see if that is the issue.  I can't see why changing from butane to wood gas makes such a difference.  More likely it's a mea culpa with the dough.
 
Rebecca Norman
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Great to know, William! Could you post a picture? I want to do this and if you're doing it successfully I'd try to copy your system to some extent. I think preheating thermal mass above sounds key.
 
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