So I was browsing the bay and found this silent adapter for 111 roarer burners: Flame shot looks authentic and not Photoshopped. Now I've been waiting for a 111 silent adapter and am skeptical it will work as 1) It seems too simple a design 2) If design does work how come nobody has produced one already? It looks great as I can swap from roarer to silent in a jiffy but will I be disappointed? Opinions?
I have a question about silent burner caps in general - apart from the fact that they are quieter, do they change the stove's BTU output? Or make it more/less fuel efficient? I've never played around with one, but both my stoves (MSR & Svea 123) are burner plate devices.
Several people do make 3D printed silent burners for all sorts of stoves In my experience silent burners are hotter than roarers as far as actual BTU s no doubt someone else will chip in. Simplicity is not always a sign of bad design but of course price is a factor as well?
@Hoarder It shouldn’t work (!) given the construction of a conventional silent burner or ‘converter’ cap. It appears to be not so far removed from a silent burner outer cap perched on an Optimus 111’s roarer burner windscreen - which isn’t encouraging as you see …
I'll be surprised if the flame is good but I think the principle is fairly sound albeit unconventional. I'll report back Alec.
That wouldn't be encouraging at all, but isn't the profile of the long skirt on this burner designed to sit in the shelf which would otherwise be occupied by the standard roarer flame spreader?
Yes- my thoughts exactly re it being simply an outer cap perched on top. The 111 has a vaporising chamber on the top and there is no good way for heat to transfer to it from the silent cap- hence the yellow flames in the vid
Clearly it is Ian, but that’s surely a refinement to secure it in place rather than a significant contributor to combustion.
Hi Everyone I have just received one of these today. Well made from quite thick solid brass. It does reduce noise on a roarer I would estimate 40% quieter with kerosene, but the flame tips are a bit yellow. Same burner with normal ring was nice and blue. Not tried it with white gas as I only use kero in these.
Hi Snwcmpr After a while the whole cap did start to glow orange. The heat must transfer through the part resting on the ring support. The brass is around 2mm thick so a reasonable contact area , maybe more than the original ring.
There is also some burning beneath the vaporiser and the flame comes through the cap so some from there as well. Shame about the yellow tips with kero though.
That flame is burning through the cap not on the cap where it should be. It might not be underburn in the truest sense but it is not working properly. I saw this a lot when I was trying to silence a dragonfly on the cheap. At best its inefficient, at worst it will kill the stove. Maybe the cap was designed for the petrol only burner
Or the operator, in an enclosed space it looks to be kicking out a serious amount of carbon monoxide.
The problem is with a traditional kero roarer is that it is designed so it can only work as a roarer. The fuel has no mixture/flow control into the burner with a large portion of the air supply coming from around the flame. In a silent burner the fuel air flow is controlled to mean there is just enough air for vaporization and the flow is high enough to supply slight pressure at the holes The vast majority of the flames air comes from outside the burner. If there is too much air inside the burner it will underburn and in this case the flame visible inside the burner shows this is happening
Hi Lampenstove I assume you did the standard preheat- meths in bowl - light - wait for flames to nearly die then open the valve? As there was alreadya flame inside I assume it will continue to burn inside the burner (simliar to underburn as others have said) So to eliminate underburn, can you do a double preheat, wait for all the flames to disappear, then open the valve and light the silent burner? Does the flame stay on the outside or does it still migrate inside? Cheers
Hi The cap is sitting on the flame ring of the roarer type burner not a silent burner. I bought it as a bit of an experiment. There is no way the jet of fuel can avoid the underside of the roarer burner vaporiser and the flame starts there as it normally would. It then extends through the cap as per the photo. It does reduce noise but the yellow flame isn’t right. I don’t think it was ever conceived as a true conversion to silent burning. Yes the usual good priming with lots of bio ethanol was used with the cap in place and then lit once this had extinguished.
