HV Microcoils

[Dampmaskin]

Heat dissipation to the body reduces efficiency but at the same time reduces condensation inside the atomizer which increases efficiency.

Condensation is a symptom of a cool atomizer. A coil that keeps the atomizer cool is more efficient than a coil that heats up the atomizer to the point where condensation does not occur. I believe this difference will vastly outweigh the small efficiency loss from a minute part of the vapor condensating.

 

[Alexander Mundy]

Great discussion topic here aalwani, been lurking since you created this thread.

Got some 38 gauge Kanthal I am planned to make a 12 strand braided coil out of when time permits, however I might just take a shot at a micro with less braids when I get an extra moment and throw 2 batteries at it to check it out.

 

[Aal_]

Thanks Alex. Would be interesting to post your findings.

Now back to my trials. 33 awg today. 18-19 wraps totalling 6.5 ohms. I think I hit a plateau in wrapping. This wire is a ..... to wrap and doesn't won't to compress or stay put. The edges wraps didn't want to join the center. However I made sure the coil is lighting from the center outward. I'm getting full dense clouds at 7.5 watts. Is this real life? Lol. Even at 7 watts it is satisfying!!



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[super_X_drifter]

Here is the micro I just wrapped for cyclone on my VV grand. It's 29 ga wrapped using a .055" rod on my artistic wire gizmo. 2.15 ohms.

Here it is wicked with some Koh Gen Do cotton.

The vape is very nice.

 

[Aal_]

So getting limited by voltage in current VV/VW devices I decided to go another path. I will make some trials ASAP. I will go dual coils to cut the resistance but double the wattage. The minimum I reached now is 7.5 watts. I will try with the 34 gauge wire 20 wraps but that will give 10.32 ohms which is 8.5 volts at 7 watts surpassing dna limit of 8.3. So i will go dual coil with 10 wraps each side by side which will give me individual ohms of 5.4 and total of 2.7. Will have to increase wattage to 10 watts so that each one takes 5.

So due to the limits of voltage and the 3.2mm target of my coil I think the 33 kanthal 18 wraps is best with 6.5 ohms at 7.5 watts.

I still have to test with Nichrome since for same gauge it has less resistance which allows me maybe to reach the 36 gauge.

Ps:for duals I guess I will have better performance since both coils will light up at same time decreasing lag by half.

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[Aal_]

Finally I might have a solution to duals depleting batteries faster. Who knows one day I might be running quad coils at 7 watts and people staring at me lol. But I need voltage voltage voltage!!!

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[Aal_]

This is a small experiment. 2 coils in parallel next to each other. Finally I can use the 3 posts atties with only 1 airhole lol. Here I left the other end to be trapped by the cap since it is a 2 post atty. Anyway each coil is 10 wraps of 33 awg yielding 4 ohms so total 2 ohms. On a provari at 4.5 volts which 10 watts I'm getting my sweet spot. This is 5 watts per coil. Indeed the fast lighting up of the two coils seems to reduce the lag further more since you have 2 centers lighting up instead of one. Next I will try some 34 gauge but I have only Nichrome. Time to order some high gauge kanthal wires. If I can reach the 4 coil wraps with a final resistance of say 4 ohms (each one 16 ohms) that would be perfect



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[LouEyez]

So you're saying that a 4 or 5 ohm coil on a DNA 20-30 is better than the 1.4 ohm coil I'm running currently....interesting. I'll see of I can find some of the thinner wires I should still have and try it. Thanks.

 

[Aal_]

So you're saying that a 4 or 5 ohm coil on a DNA 20-30 is better than the 1.4 ohm coil I'm running currently....interesting. I'll see of I can find some of the thinner wires I should still have and try it. Thanks.

It is better in terms of battery for sure. However you have to keep in mind to cover enough wick surface for your liking. My coils are 3.2mm wide which with 32 gauge wire turns out to be 16 wraps.

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[LouEyez]

This isn't bad...12 wraps of some really thin wire, wasn't marked so I'll assume 32 gauge.
I'll try twisting it next so that I can double the surface area

 

[Aal_]

What was the diameter? If you are happy at 7.5 watts that's great. Try the twisted I haven't really tried it. It is interesting to let me know if the heat up time becomes lower or it stays the same. If it slows the heat up time then it is counterproductive you will have to increase watts. I suggest wrap more wraps around 16 and make the diameter 1/16. According to the ohms I'm doubting it is 32 because too high ohms for 32. Depends on diameter of course.

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[LouEyez]

I'm wrapping around an "about" 2mm bit. The twisted, with 16wraps covered more surface area and at 4ohms 10 watts was producing good vapor, but to be honest, flavor isn't there. Vaping side by side this (even bumped up to 11 watts) and another set up at .4 ohms, one feels like water and the other like wine...both satisfying in their own ways.

 

[Aal_]

I'm working on comparing flavors as well. Thank you for your feedback. Thin wire has the disadvantage of less liquid on metal because metal is thin.

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[LouEyez]

I'm working on comparing flavors as well. Thank you for your feedback. Thin wire has the disadvantage of less liquid on metal because metal is thin.

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And it's hard to work with...you should try a hydra coil

 

[S2KG]

I want to jump in here. I have also been experimenting with this. (I want to get maximum battery life, while also getting maximum flavour and vapour)
I'm having some issues which may be due to my build, or the rayon cellucoton I use as a wicking material.

In the past, on a VW device I would run 5/64 12 wrap 28 gauge dual coils. Wicked amazing with Rayon.
I then started vaping on single coils at 20 watts (Faster heat up time, close to the same amount of vapour, high ohm 2.2 - 2.4Ohm!
Unfortunately if I do 12 wraps of 28 gauge with a single coil, it heats up so fast I get dry hits. (Using rayon)
If I do a 3/32 12 wrap of 28 gauge I can get away with it. 2.2 ohm, long battery life, great vape. But a smaller diameter heats up to quickly for wicking.

I just built a 10 wrap 3/32 and I feel it is offering better flavour. It is less wraps, but I believe I'm having better wicking efficiency and the concentrated heat from less wraps is also popping out the flavour more.

To what extent will more wraps have a negative impact on our vape? Assuming you can pump more and more voltage at higher wraps to heat them up just as quickly, I would imagine eventually you would come into wicking issues etc, thus having to determine proper wicking / level of concentrated heat with good amount of surface area.

I have not tried 5/64 10 wraps yet, I'll give that a go in a bit.


Maybe I should go back to cotton until I find the perfect build, from there I can start fiddling with rayon again.

Thoughts?