Another reason I heard was there may be an air pocket inside the wicking. A full rope of Sally's rayon is a lot of space that could hide one.
I was thinking about trying a contact coil to see what happens, TD. I've always made spaced coils, never contact, and that may be the ticket. Next time I rebuild I'll give it a go.
I don't think there are any significant air pockets in the wicks. I'm pretty careful, OCD, about getting the wick nicely compressed prior to putting it in the coil.
I don't think there are any significant air pockets in the wicks. I'm pretty careful, OCD, about getting the wick nicely compressed prior to putting it in the coil.
They are all I've used for a long time. You are going to be working out hot spots with a contact coil but a quick strum down the coil with a screwdriver usually gets rid of them quickly.
That may be a problem. I only use titanium coils so red hot just ain't gonna happen. I can bring them up to a dull red, but that's about as far as I want to go to avoid oxiding.
I am not sure how you are going to get rid of hot spots with Titanium Claptons. Got a FLIR camera around Mike?
I mostly use spaced coils 
For me Spiting & Popping is all ways a too loose wicking issue. I use Ko-Gen-Do & most of use's use Rayon, So cant say why it happens to use's
I use a few Ni 80 Contact coils & don't notice much difference in spaced Versus Contact
For me Spiting & Popping is all ways a too loose wicking issue. I use Ko-Gen-Do & most of use's use Rayon, So cant say why it happens to use's I use a few Ni 80 Contact coils & don't notice much difference in spaced Versus Contact
In fact yes. Hot spots in spaced coils are no problem with TI claptons, never tried contact coils.
I "think" I have narrowed it down.
In my case I am positive the wick is full and well compressed. I have a full rope of Sally's stuffed inside a 3mm coil, it is very snug.
A trick I got from @awsum140 is I split a full rayon rope in half and then thread each half from opposing sides until the full thickness of the rope is filling the coil. It minimizes deforming the coil, otherwise a full rope put in from just 1 side destroys the coil symmetry. Then I trim off the orange lines, flush with the coil, and fold the longer top half to dip down into the juice wells. This way I have thinner legs in the well, which rayon likes, over-stuffing the well doesnt work well with rayon.
I suspect that I just made a very efficient wick this time and it is saturating itself too much. I get bubbles after every single hit (which I perceive as a sign of good wicking). When I cut the juice flow back the spitting and popping reduced, when I opened the juice flow it increased. I suspect that a lot of cold juice is contacting a hot coil and causing thermal shock. Anyway, I cut the juice flow off, on a mini Merlin there is still plenty enough juice seeping through for a good hit and it is down to mild gurgle instead of popping.
Rayon does seem to wick really, really, well. My normal trim on the tails of wicks reduces them to about 25%, or less depending on the atomizer, from the amount in the coil
Then my FreeMax Mesh Pro using the triple mesh coil with its six 6x3mm juice ports should be popping like crazy. The wicking is so fast that it can wick 1ml worth of 80% VG juice every 20 seconds. I measured this by taking a dry coil and dumping 4ml worth of juice into the tank. Then looking through the top, you can see everything. And in 20 seconds the wicking is totally saturated. Then measure how much juice left in the tank (only 3ml was left).
Also when dripping, I can't ever recall a time when I dripped cold liquid on a hot coil that it ever caused any popping. AFAIK, popping only occurs when a cavity builds up pressure and then suddenly releasing. You know, like popcorn. And shaking a can of pop does it too. Enough pressure builds up and it will pop with a sizzling noise being released through a very small opening.
Well I can imagine sliding two wicks in opposite directions through a coil could cause a scoop mark along the surface between the two. Thus causing a cavity to form between them. And that could explain why some builds do it and some doesn't. As how would you know until you fire it up? As it either pops or it doesn't.
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Chimney coils give a me a flashback to the 2 times i built vertical chimney coils in my Lemo 2 about half a century ago...worth all the hassle?...no...also the most coil porny i ever got.
Like this, only i am not an euro youth
Bonus because he actually says toot suite...
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