After concluding my work on the Primus Vari-Fuel stoves I decided to see if the same changes could be made to my Trangia 25 with a modified Himalaya MF burner. First, I replaced the MF fuel line with an older VF fuel line so that I may use the metal pump which IMO has better control than the newer model. I also had previously painted the windscreen in orange 550-degree engine enamel. The color ended up being darker than I wanted but looks good none the less. The original burner bell diameter of the stove was just over 2 inches and was reduced to 1.75 inches. I reduced the legs on the PuppyDawg cap to fit inside the burner bell enough to reduce wobbling but remain easily removed when cold. The stove was then mounted in the Optimus Trangia adapter cup assembly that I had on hand. Here are some shots of the stove. BTW as far as I know Bernie Dawg aka Gary has given up on the cap business as the supply of bronze infused stainless has ended. The hardest part of the whole project was taping off the windscreen for paint. Also, even though it was scuffed, cleaned, primed and painted then cured, the paint still chipped when the tape was removed causing me to touch up the paint and recure. If I ever decide to paint another it will be gently bead blasted before painting. Hope you like this post. Mike
Just in case someone was curious about the btu output of using a .32mm jet and Coleman fuel, well I just did a boil test using a .7L Primus Eta pot and with no lid recorded a time of 2 minutes 28 seconds on high. In the future I'll probably turn it down a bit. It also did just fine toasting a ham and cheese. If I had a lid for my Trangia fry pan I would have used it. In this case I used an 8" GSI Pinnacle frying pan.
Howdy, @HunterStovie , Mike, that's a very interesting experiment! It looks like things are working well, in the combinations you put together. I only have experience in using a Nova burner in a Trangia kit, and it worked a treat. I can't tell from the photos, but is the burner favoring one side a bit. If so, I would worry about melting down the Trangia windscreen on that side. It might be the angle of the photos, but it looks that way to me. Thanks for sharing, and well done! Every Good Wish, Doc
Thanks for the response, Doc. One problem using the Optimus adapter which only supports the stove front to back there is some pressure from the weight of the fuel line drooping but not enough to really matter. In the 10th picture the flame is pretty well centered, and I don't plan on using the stove on full blast, but your point is well taken. Definitely not for the Trangia 27. Mike
Well, I was wrong, should have read the label on the measuring cup. It was actually 500ml. So this morning I reran the tests with both the .28mm and .32mm jets and got 5 min 30 and 4 min 45 respectively. Then I cooked some eggs. These were with the .28mm jet and at this altitude "6000 feet" the flame is looking a little lean. At some point I'll have to try out this combo above 10,000 feet to see if it makes a difference.
Morning, Still and all, the flame is looking pretty good, in truth. You're making me want to dig out my Nova/Trangia setup, and play around a bit. No time, right now. But, soon, I hope to do that. Thanks, again, for keeping us up to date, and well done on your fettle. - Doc
When it happens, I'll let everyone know. Unfortunately, I can no longer hunt, and we sold our property at 9600 feet years ago. The highest I've been this year was only 8000 feet when we visited Yellowstone.
