Calling BS on dual coils!

[Smithereens]

If you are not going into low, low sub ohm territory where you just could not get enough wraps of wire around your wick, dual coils are a waste of effort, wick and wire.

I have a dual coiled Trident at 1.3 ohms and I have spent the last two weeks comparing it to a single coil Igo-L at the same resistance. Vapor and flavor production are darn near even... The Trident might edge out the Igo by the slightest amount, maybe. But the thing is, dual coils are thirsty! Battery life with a dual coil is much shorter. I swap out three batteries a day with dual coils while a single battery (18650, 1500mah) will last almost the entire day. juice consumption seems higher with the Trident as well, not a great deal, but enough to notice.

For daily, normal vaping, single coils win.

But for making vast, blanketing banks of fog... dual coils, huge airflow, obscenely low resistance and high VG juice on a good battery are the ticket.

 

[emus]

I run dual coil for lung hit.
I mostly run single coil for mouth to lung.
My duals are mostly 0.6 ohms and my singles are mostly 1.2 ohms.
Completely different vaping experience; dual vs single.
No baloney.

 

[ImThatGuy]

So...uh...what's the bs on dual coils???

 

[Smithereens]

I run dual coil for lung hit.
I mostly run single coil for mouth to lung.
My duals are mostly 0.6 ohms and my singles are mostly 1.2 ohms.
Completely different vaping experience; dual vs single.
No baloney.

I "lung hit" (I picture Bruce Lee punching someone in the chest and pulling out a handful of lungs every time I read that phrase...) on my 1.3 ohm coils. But yeah completely different. I'm hovering around .5 ohm on duals... I like it, but hate draining batteries so fast.

 

[emus]

I "lung hit" (I picture Bruce Lee punching someone in the chest and pulling out a handful of lungs every time I read that phrase...) on my 1.3 ohm coils. But yeah completely different. I'm hovering around .5 ohm on duals... I like it, but hate draining batteries so fast.

Twice coils. Half batt.

 

[Smithereens]

So...uh...what's the bs on dual coils???

Oh yeah...

Well.... Uh....

It made a good thread title anyway!

Oh, wait! I did say that unless you're going into such low ohms that you can't get a good wire to wick ratio dual coils are a waste of resources and that the performance of a single coil setup is about the same but more efficient. That makes anything >1ohm and dual coil nothing but hype.

 

[emus]

Oh yeah...

Well.... Uh....

It made a good thread title anyway!

Oh, wait! I did say that unless you're going into such low ohms that you can't get a good wire to wick ratio dual coils are a waste of resources and that the performance of a single coil setup is about the same but more efficient. That makes anything >1ohm and dual coil nothing but hype.

Don't know bout that. I had a 1 ohm dual coil that was a pretty nice cloud maker at 3.7 volts.

 

[Funk Dracula]

I'd just like to see more side airflow RDA's come out designed to really nail down chamber size and airflow control for a single coil.

I realize the 22mm is desirable because of it's flush look, but it lends itself to a de-facto dual coil setup and sized chamber; with single coil being an after thought.

 

[emus]

I'd just like to see more side airflow RDA's come out designed to really nail down chamber size and airflow control for a single coil.

I realize the 22mm is desirable because of it's flush look, but it lends itself to a de-facto dual coil setup and sized chamber; with single coil being an after thought.

My favorite toppers are 14.5 mm IGO-F and 17.5 mm AGT. Concur large chamber isn't desirable for single coil mouth to lung build.

 

[Dampmaskin]

I haven't started experimenting with dual coils yet, but it's all about surface area, right? Well I built a 3.1 ohm 1.85 mm ID microcoil in my Squid the other day. It's easily twice as big as any other microcoil I've built yet. I have to run it close to 6 V for anything to happen, but when it happens, it's pretty assertive.

Question: Running a variable regulated mod, what is the practical differences in the vapor quality between using a length of wire to wrap one coil, and using the same length of wire to wrap two coils and run them in parallel?

The mass and surface of the coil would be the same, and setting the mod to roughly the same power, I would think that the surface temperature would be similar as well. The only differing thing I can think of is wicking, is that right? Now if you wrap the single coil on a slightly larger ID...

 

[sawlight]

I haven't started experimenting with dual coils yet, but it's all about surface area, right? Well I built a 3.1 ohm 1.85 mm ID microcoil in my Squid the other day. It's easily twice as big as any other microcoil I've built yet. I have to run it close to 6 V for anything to happen, but when it happens, it's pretty assertive.

Question: Running a variable regulated mod, what is the practical differences in the vapor quality between using a length of wire to wrap one coil, and using the same length of wire to wrap two coils and run them in parallel?

The mass and surface of the coil would be the same, and setting the mod to roughly the same power, I would think that the surface temperature would be similar as well. The only differing thing I can think of is wicking, is that right? Now if you wrap the single coil on a slightly larger ID...

I tried running them in parallel, I had the same thought, smaller mass, less time to heat up each one. The biggest problem I had was getting them to heat evenly. When I first set it up it worked great, but after it gunked up the first time trying to get them clean and have them heat evenly was next to impossible. One would heat before the other and gunk up quicker than the other and so on.
This was with 28 gauge wire running two four wrap coils at 1.8 ohms. YMMV.

 

[zapped]

Dual coils were one of those ideas that looked good on paper but didnt pan out in real life. I have much better results with single coils.

 

[jonhall2]

i am in the same boat when it comes to dual coils. i came up with a 30 ga six wrap around swiss army knife tweezers. a tall box shape coil that fits neatly in kanger dual head. got a 1.6 ohm sizzzler wicked with cotton that puts stock head to shame.

 

[jjcordone]

I have to agree. I went to dual coils but the additional battery drain and the increase in juice usage just didn't seem to be worth the difference in vape quality. It reminds me of Gillette continuing to add additional blades to a razor

 

[rurwin]

i am in the same boat when it comes to dual coils. i came up with a 30 ga six wrap around swiss army knife tweezers. a tall box shape coil that fits neatly in kanger dual head. got a 1.6 ohm sizzzler wicked with cotton that puts stock head to shame.

Interesting idea. A circular coil has the highest volume with the lowest surface area. (That's why bubbles are spherical). That is exactly what we do not want, so any change in shape has to be good. On the other hand, other shapes have corners and that might lead to wicking problems. Maybe triangular might be going too far, but I will have to try your square coil.

ETA: Actually, your rectangular shape might beat a triangle; if it's tall enough it approximates a two-sided shape.

The other layout I want to try is a figure eight coil. One coil with two wicks and effectively a dual coil in series. It shouldn't have any problems with symmetry, but it would tend to be high resistance so it might need high voltage.

 

[Visus]

you have to build your own to your deevice specs..

 

[Bunnykiller]

I found a long nano produces a fair amount of vapor compared to a micro coil of the same ohms/wire ga.

 

[jp_cfc09]

I havent started rebuiding my coils yet so wouldn't know but Ill take all your word for it. what I can say tho is factory coils do make a difference when it comes to duel coils. I mostly use iclear16 and theres a big difference in the pre made coils you buy, the duel coils do work alot better then single ones.

 

[Mitey F]

Question: Running a variable regulated mod, what is the practical differences in the vapor quality between using a length of wire to wrap one coil, and using the same length of wire to wrap two coils and run them in parallel?

The mass and surface of the coil would be the same, and setting the mod to roughly the same power, I would think that the surface temperature would be similar as well. The only differing thing I can think of is wicking, is that right? Now if you wrap the single coil on a slightly larger ID...

With = total wire length, the resistance of the dual coil will be 1/4 (yes, 1/4!) that of a single coil. Say you have a length of wire that gives you 2 ohms as a single coil. If you cut it in half, you're going to have 2x 1 ohm coils. 2x 1 ohm coils in parallel give you 0.5 ohms.

 

[rurwin]

With = total wire length, the resistance of the dual coil will be 1/4 (yes, 1/4!) that of a single coil. Say you have a length of wire that gives you 2 ohms as a single coil. If you cut it in half, you're going to have 2x 1 ohm coils. 2x 1 ohm coils in parallel give you 0.5 ohms.

But with constant power, as Dampmaskin said, there will be the same power dissipated in the coils, and there will be the same heating effect as it will be dissipated over the same area. The mod will have to supply half the voltage to do that and if it can only supply say 3V to 5V, it will not be able to drive one or other configuration.

And that is why you might want to use dual coils -- to increase coil surface area while still being in the operational area of the mod.