Discussion in 'Fettling Forum' started by OutdoorStefan, Aug 30, 2021.
does some know the technical difference between these two generator types?
Is there a kerosene generator for the 500? I did not know (think) there is.
I mean 500 Series: 550 A and 550 B.
Smaller jet orifice for kerosene.
What is "jet orifice"?
The tiny hole in the jet nipple, out of which vapourised fuel emerges.
The kero generators seem to have been easier to find recently. If you want to burn gas and can find a kero generator, you can take the gas tip off your clogged generator and install it on the kero generator. Or, the stove actually burns gas and kero just fine with the kero generator with no change. The power on gas is just slightly reduced but is still plenty hot.
Hi Brad, that sound easy. Any problem if I use a gas generator and burn kerosene?
Yes. The fuel will not have enough oxygen, will run "rich" with poor combustion.
Agreed, the gas jet is too large to burn kerosene well. I must confess I have not tried burning kerosene with my gas generator. Give it a shot and let us know how it went. Don’t forget to prime the generator when burning kerosene. Brad
@ Brad: What do you mean by "to prime it"?
@ all: The generator consists of 3 parts:
1. the tube
2. the thin wire
3. the jet nipple / nozzle
I understood that part 3 = the jet nipple / nozzle at kerosene is smaller (smaller hole).
part 2 = the thin wire is also thinner or is it the same size (thickness)?
part 1 = the tube is the same?
As far as I can tell, the wire and tube are the same. Only the jet is different. Coleman’s directions for the 550B stove say to preheat the generator. Some call this priming. On the 550 stoves the burner ring is a trough in which I pour denatured alcohol. I use the feet adjusting ring to tilt the stove so the liquid alcohol concentrates under the generator. I light the alcohol, which burns and heats up the generator so it becomes hot enough to vaporize the liquid kerosene. I wait till the alcohol burns out and then light the stove as I open the valve for the kerosene. When burning gas in mild temperatures, the stove will “instant light”, which is a wonderful feature of most Coleman stoves. However, kerosene is a heavier fuel that needs a hot generator to vaporize. In below freezing temperatures you may also have to prime the 550 stoves when burning gas.
Gas = gasoline = benzin
Hi Brad, thanks for explanation. OK - I got it.
In the meantime I have
a 550 B from Feb 2006 (ebay) (which I run with white gas)
my old 550 B from Nov 1990 (which I serviced completely and start running with RUG again)
a 550 A from Feb 1988 (ebay) which is just in my service-process which I plan to run with kerosene
I have several generator spare parts which I successfully cleaned with acetone. I just try to find out if I can separate all the nozzles in a) small hole = kerosene and b) large hole = gas
I will keep you updated
I have a Coleman 425 I use kerosene in. After the prime it runs great.
Hello, I also have both generators for 550B with both generator assy parts.
The wires might not the same, I don't sure very well but the wire from the Generator ass'y for Kerosene might have smaller diameter. Let us know if I remember wrongly.
If it's important matter for anybody, will measure both exactly soon.
Thanks, Yun. I am likely too lazy to pull out the wires and check with the calipers.
So I am!
Today I startet the measurements. The wires seem to have 2 different thicknesse:
a) 0,3 mm
b) 0,23 mm
See pictures attached.
The next days I will try to measure the hole in the nozzle. I will use a digital measurement microscope with backlight illumination. Looking forward to report the results soon...
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