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Everything posted by shoshi

  1. Hello, I have an Olympic torchbearer gas kiln model 2827G. It's a basic updraft with 4 venturi burners and I fire it manually using cones and a pyrometer with 2 leads to monitor the temperature. I've used it for bisque and oxidation glaze firing-both low and high up to cone 10. The problem has always been the temp difference between the bottom and the top shelves. There is usually around 100 degrees celsius difference (sometimes more) with the top being hotter. I've tried packing the top denser than the bottom with some success. I also tried moving my shelves to act as saggers with the hope it would redirect the flame. That made the bottom even cooler and I aborted that firing until I could rearrange the shelves back to usual configuration. The longer I fire it, the less difference there is but the longer the top shelf is at a mature temperature so it can end up over fired and the bottom under fired. Does anyone else have this problem with this kind of kiln? Any ideas on how to solve this? Thanks
  2. Hi,I've been diverting the flame on two burners, shelf two inches from the top, and packing denser for the past three firings and it is better than ever before but still a variable difference between top and bottom. So I just want to double check-- your bottom shelf is resting on the insulating bricks and is 2 inches from the floor with the flames traveling up the sides of the kiln with no diversion? Thanks
  3. Hi, I have been firing a 2827G for the past year with the same disappointing problem. I have tried the diverting flame on two burners, the self 1 1/2 inches from the top, packing more densely with staggered shelves - but to no avail. I deduced that it was colder at the bottom because more cold air was being drawn in via the rather large burner ports in the bottom of the kiln. Which was also the reason that I couldn't reduce the bottom half of the kiln. What I tried was to take 4" standard insulating bricks and drill a 2" hole near one edge and mitre the edges to fit snugly into the angle so that the hole is centred over the burner. The 4 bricks now support my bottom shelf. The difference in temperature between top and bottom is negligible (the bottom being slightly hotter) and I get reduction throughout the kiln.
  4. Thanks a lot! I'll try your suggestions. Shoshi
  5. Thanks a lot! I'll try your suggestions Shoshi

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