Is it the wick?

OK, so two of the Juwel 33's have finally been rebuilt (If anyone knows of any more Juwels, or an Arara37 thats up for sale, would you let me know please? )

Anyway, the problem is that both of them pulse when fired up...

The deal is this:

Both have been rebuilt from the ground up. All the rubberwork in the pressure release valves has been replaced with Nitrile, fully decarb'd the main parts, teflon taped the thread where the stem enters the tank, checked the spindle and the graphite packing.

Both filled 1/2 full with Coleman fuel (fuel checked for water content on the KF at work to check for possible contamination. Result was less than 1PPB - so no problems there)

Both Juwel's prime and fire up easily.

Now, here's the problem. The one with the brass tank burns with a perfect blue flame, but pulses, sounding all the world like a steam train is chugging by, the steel tanked one burns with a slightly orange flame and yes, like the other one, pulses.

So far, the only thing I can think of is that the wicks are either a: past their best b: not shoved far enough up the stem.

Am I on the right track?

Cheers,

James.

 

I hope someone a lot wiser than I am will jump in here and correct me here. It sounds like before the combustion it's pulling air into the fuel. This is a rather classic case of incomplete combustion. The fuel / air mix is not taking place where it should but before it gets to the proper place for the mix.

Please someone come along and give Kermit better help than my humble effort can provide.

 

The 123 and the 8R both have wicks and they both pulse... Normally.

 

I had a MEVA clone of the ARARA 37. It pulsed when running just as a Svea 123, and all the similar self pressurizing petrol burners do. That lovely purr is normal.

It has to be one of the most comforting sounds in the world when one is holed up under a rock outcrop in a snowstorm trying to fix supper in the dying light of sunset.

Gerry

 

Just realised I may have had a bit of an idiot moment....

Tested both of 'em today in the back garden, heating up about a pint of water in a small diameter stainless steel pan. As the heat was obviously reflecting off the bottom of the pan and heating the tanks up even more, its obviously increasing the pressure - which had the effect off smoothing off the fuel delivery, decreasing the "chuffing" sound a lot to - as you put it so well - a purr.

Oh, and given what has been said about the 123R around here, I ended up ordering one today from Outdoor-Extreme.co.uk to add to the collection