Re: need advice for homade propane furnace

On Mon, 16 Apr 2007 09:18:54 -0500, "Ben" <nospam@xxxxxxxxxxxx> wrote:


<marc.britten@xxxxxxxxx> wrote in message
news:1176726962.505405.80120@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Apr 15, 6:18 pm, "Ben" <nos...@xxxxxxxxxxxx> wrote:

http://www.backyardmetalcasting.com/oliverburner1.html

I've used every combination of upwind/downwind and pipe size combo's you
can
imagine. And read many web sites, many. The part that feeds the furnace
(end of the pipe) is 3/4" metal blackpipe angled offcenter, etc. The
outlet
hole in the lid is about 1.5" across. The issue is that as soon as I
place
the lid on, the flame either goes out or comes out the top creating a
very
dangerous gas buildup in the furnace so that when I remove the lid, POOF
major dangerous flamage.

Your probably not getting enough air in at the burner. First thing I
noticed looking at the design page vs your pictures is that you seem
to be missing the air intake holes after the propane.

Thanks Marc, as I mentioned in orig post I have several configs. The one
show is a downwind setup where the air is pulled from the back. I also have
the exact upwind setup with 6, 3/8" holes as well as another larger downwind
setup using a 1.5 inch to 1 inch intake. *All* fail when capped.

It appears my problem isn't air but fuel. I couldn't find a drill bit
smaller than 1/16" so that's what size hole I have for fuel jet. Their
saying too big unless I use forced air. Using forced air is a possibility
but I'm going for a naturally aspirated config so am going to attempt to use
a "vamp-clamp" to pierce a smaller hole in brass today. I know I'm shooting
for about 3/4 millimeter vs what I have now which is about 1.5 millimeters.

Hey if you know of a common place to get a #57 or #60 drill bit please let
me know.

Thanks for the reply.

=B



Do a Google on "Forge Burner" ( I'm sure you have but I don't remember
which site I saw it on) somewhere I saw a chart listing the hole
diameter of MIG nozzles and the recommendation to use them for the
metering jet. Also there is considerable discussion of jet sizes and
recommended pressure regulators on several sites.

The burner I built is a copy of the Rex design as it seemed to be the
most efficient type, although in actual practice it may not matter. I
don't remember the actual sizes but to select the metering jet size I
arbitrarily decided on 10 PSI fuel pressure and then drilled the jet
so that was as close to a neutral flame as possible.

Re drills,:any mechinery supply shop should be able to supply either
individual drill bits to #80, or a set thereof.


Bruce in Bangkok
(brucepaigeatgmaildotcom)

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