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Post by matthewwalker on Oct 17, 2017 11:18:05 GMT -8
Hey Gang. As you all know the pre-port secondary air system when used in Peter's batch and my ceramic fiber batch and cook stoves offer a lot of advantages, but have one significant disadvantage. They deteriorate over time, and the better the stove, the faster they go. I've finally found a solution to the durability issue for all of us. Aftermarket auto exhaust parts are often made of 309 stainless, thin wall, and come with flanges for mounting. I simply drill and tap the lower horizontal section, and bolt the vertical to it. Cheap, easy, durable. Amazon linkMy Walker Stoves pre-port page |
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Post by Orange on Oct 17, 2017 12:40:06 GMT -8
haha great!
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Post by briank on Oct 17, 2017 15:09:58 GMT -8
Great, perfect timing too, as I was noticing severe spalling after just a few fires (one of which I let get way too hot) in a ceramic board batch box:  |
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Post by matthewwalker on Oct 17, 2017 15:28:01 GMT -8
Thanks guys. Glad to hear it's helpful.
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Post by permaculturebob on Oct 17, 2017 16:43:24 GMT -8
I'm a bit confused, is this secondary air supply what was called the P channel?
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Post by DCish on Oct 17, 2017 17:00:14 GMT -8
Hah! Too cool! Any slit cut into it, or are you just using it open like that?
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Post by matthewwalker on Oct 17, 2017 17:33:32 GMT -8
Bob, you can read about my pre port air in the link to my site above.
DC, no slit in these. I haven't tried. I suspect they are more durable as a complete pipe, perhaps with a small performance trade off. Needs to be A/B tested to know for sure. Maybe this winter.
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Post by Vortex on Oct 18, 2017 1:30:46 GMT -8
Matt, your 'Amazon Link' is just a link to this forum thread page, I presume it's meant to go to the exhaust part?
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Post by matthewwalker on Oct 18, 2017 5:59:29 GMT -8
Thanks Trev, fixed I think.
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Post by permaculturebob on Oct 19, 2017 0:45:31 GMT -8
I've been reading the threads of development, sort of like a novel about development of technology in the digital age. Thanks of course to everyone for sharing, and it is amazing what happens when lots of like minds start playing with a challenge. Evolution in hyper drive.
My only thought is that mufflers often burn out way before the flanges and connecting pipes, might be a downstream recycle or whatever they call it when something is simply reused. Will be interesting to see just how well this new part works and how long it lasts.
My old j channel is definitely in for some renovation when I get back.
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Post by briank on Nov 29, 2017 19:33:04 GMT -8
Another possibility: 1.67” diameter marine grade 316 stainless. The tube can easily be removed from the stainless steel flange base and replaced if/when it eventually burns out. Steel tube thickness is 2mm/ 14 Gauge. (It’s simply marine grade stainless handrail tubing and hardware.)   |
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Post by Orange on Nov 30, 2017 3:24:54 GMT -8
nice solution, fancy  |
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Post by etownandrew on Dec 30, 2017 11:51:03 GMT -8
Hey Gang. As you all know the pre-port secondary air system when used in Peter's batch and my ceramic fiber batch and cook stoves offer a lot of advantages, but have one significant disadvantage. They deteriorate over time, and the better the stove, the faster they go. I've finally found a solution to the durability issue for all of us. Aftermarket auto exhaust parts are often made of 309 stainless, thin wall, and come with flanges for mounting. I simply drill and tap the lower horizontal section, and bolt the vertical to it. Cheap, easy, durable. How do you position it in relation to the port? Is it back 1 1/2" from the port? Do you just cut the exhaust part in half to make two or is it cut a particular length to say be half as tall as the port? |
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Post by matthewwalker on Dec 30, 2017 15:30:12 GMT -8
Yes, position is the same as the original Pre Port I developed. It is cut in half.
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Post by briank on Dec 31, 2017 19:48:48 GMT -8
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