Casapa Posted December 28, 2018 Share Posted December 28, 2018 Anyone tried or even seen these burners? Just browsed into it and it sparked curiosty and the prices seem ok. Apoloigies if posted before. Also found a build here Quote Link to comment Share on other sites More sharing options...
MonkeyForge Posted December 28, 2018 Share Posted December 28, 2018 Tim Gunn on this forum has used them extensively if I remember correctly. A quick search yielded this thread: The have been discussed in other threads a number of times. From what I know they make a quality product. Good luck. Quote Link to comment Share on other sites More sharing options...
Judson Yaggy Posted December 28, 2018 Share Posted December 28, 2018 They are fairly rare here in the USA but I bought 3 out of a NOS lot of 50 off ebay 5 years ago on speculation. Wish I'd bought all 50! I've been using gas forges for over 20 years and these burners are hands down the best burners I've ever seen. Can forge weld with 1 burner running at 10 psi. Quote Link to comment Share on other sites More sharing options...
timgunn1962 Posted December 29, 2018 Share Posted December 29, 2018 The Amal injectors are not complete burners: just the clever bit that is really hard to do in the average home shop. I've used them at work for nearly 30 years, mainly 2" injectors for pilot burners on waste gas plant, though I've also used some smaller ones. They are very good indeed. I've been using the 1/2", 3/4" and 1" for forges for a good few years and used a 1 1/2" in a forge for the first time this year. They were designed way back by the Amal Carburettor Company, who knew a bit about mixing fuel and air in a controlled manner. After Amal stopped making carburettors, etc, the injectors were made by an outfit called Grosvenor Works for many years. More recently, all the Amal IP seems to have passed to Burlen Fuel Systems, who were already making Solex and SU carburettors for old British cars. The Amal carbs (for motorcycles) are the core business, but some of the more unusual things they made still have niche markets: the atmospheric injectors are used by the sort off odd folk who mess with things like forges. They also have a range of big low-pressure gas valves that are used by the even odder folk who fly hot-air balloons. I get the impression that they'll make and sell you whatever you ask for by part number, or similar precise identifier, but probably do not have the (expensive) technical staff to advise you on suitable products for new applications. That suits me fine, as I already know what I want and it keeps the prices reasonable. There is one caveat for the guys across the pond, which is that the threads are BSP, not NPT. The gas jet threads are either British Standard Pipe or British Association (1BA for the small jets). If you need a selection of jets, it is best to order them with the injector. I think the factory jetting was worked out years ago and was probably for more "normal" industrial applications with secondary air. For Propane forges, I have found the factory Butane jetting gives a slightly more useful range of mixtures than does the slightly larger Propane jetting. For non-forge applications where screaming-hot temperatures are needed, even smaller jets will get the flame temperature up higher still. Using them in a forge just causes a ridiculous amount of scale, so the Butane jetting seems about optimum. My experience has been that a straight pipe is fine as a burner in a forge. If the burner needs to work outside a forge, a flame retention cup is a good idea; one like that in the video. Note that the tapered expansion "flare" is part of the Amal assembly, so no extra flare is needed. Quote Link to comment Share on other sites More sharing options...
Casapa Posted December 29, 2018 Author Share Posted December 29, 2018 Thanks for the replies, nice info.! Quote Link to comment Share on other sites More sharing options...
ede Posted December 29, 2020 Share Posted December 29, 2020 On 12/28/2018 at 7:39 AM, Judson Yaggy said: They are fairly rare here in the USA but I bought 3 out of a NOS lot of 50 off ebay 5 years ago on speculation. Wish I'd bought all 50! I've been using gas forges for over 20 years and these burners are hands down the best burners I've ever seen. Can forge weld with 1 burner running at 10 psi. How did you fit your fuel line to the gas inlet since it's a BSPF threaded port? Also, what did you use to for the pipe nipple since the outlet is probably also BSPF threads? Quote Link to comment Share on other sites More sharing options...
timgunn1962 Posted December 29, 2020 Share Posted December 29, 2020 To get from your hose to the BSP inlet (presumably 3/8" BSP), it is best to buy suitable fittings. Over here, NPT is the PITA and NPT-BSP adaptor fittings are available at decent pneumatic/hydraulic suppliers. In a pinch, I have been known to run a tap down the existing threads (BSP tap and NPT thread in my case) and fit a "local" fitting with plenty of anaerobic pipe seal, though not, as yet, with gas pipework. I think that the pipe nipple will probably screw in relatively easily, at least in the 3/4" size (1/2" and 3/4" have the same thread pitch in both NP and BSP). I always use an excessive amount of PTFE tape here anyway (BSP into BSP) to protect the female thread in the injector, and hand-tighten only. The PTFE tape is for padding only, not for sealing in this case, so there's no need to get too concerned about whether it's rated for gas. The clever bit about the Amal injector is the super-fine adjustment provided by the screwed choke and you really don't want to louse up the threads that provide this. I also dry-lube the thread further down to ensure it will adjust freely: Dry Molybdenum Disulfide, Dry PTFE, Graphite or some combination thereof. Grease tends to pick up dust and grit, making things worse, so I don't use it. Quote Link to comment Share on other sites More sharing options...
MikeTheMike Posted March 23, 2022 Share Posted March 23, 2022 (edited) On 12/28/2018 at 6:50 PM, timgunn1962 said: The Amal injectors are not complete burners: just the clever bit that is really hard to do in the average home shop. Hi - AMAL are out of stock of the Butane burners... Do you think the Propane ones are okay to use? They've been out of stock of the Butane ones for a while I think! Edited March 24, 2022 by Mod30 Trim quote. Quote Link to comment Share on other sites More sharing options...
Irondragon Forge ClayWorks Posted March 24, 2022 Share Posted March 24, 2022 Have you tried to contact AMAL and ask them that question. Probably have to change the orifice. Quote Link to comment Share on other sites More sharing options...
tinkertim Posted March 24, 2022 Share Posted March 24, 2022 (edited) Hi Mike, The only difference between the Butane and Propane "Injectors" are the jet size. As Timgunn suggested, when I ordered my 3/4" Propane injector (that came with a 110 jet), I also ordered the equivalent Butane jet (90) so I could see what worked best in my setup. I initially used the Butane jet for single-burner testing, but when I built a multi-flame NARB and fed it with my 3/4" AMAL injector, I went back the the Propane jet as it seemed to work better in my NARB setup. What size Injector are you thinking of buying? I would suggest ordering the Propane injector in the size you want, and add the equivalent Butane Jet (in the 187-size series) to the order for an extra £6.48, and try them both out. I'm glad I did it this way, as it gives you flexibility to play, with a cracking burner. Just my £0.02 worth. Hope it helps, Tink! PS. Get the Long-Venturi Injector, as it will work as a single-burner or when driving a multi-burner setup. The Short-Choke Injectors are only intended to work with with multi-flame burners, and for the same money you get less flexibility. Another £0.02 worth! Edited March 24, 2022 by tinkertim Extra Info added Quote Link to comment Share on other sites More sharing options...
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