Coils take a long time to heat up

[rdeezy74]

I recently got a Trident V2 clone and tried building some different coil setups on it. My first single coil build, about 1.5 ohm 3 mm micro coil, was ok, but kinda weak. So I built some dual 3 mm micro coils on it with 32 ga Kanthal (came out to about 1.4 ohms total), got em to heat up at about the same time, switched my air flow control to the dual coil setting, and it was a bit better. At some point i decided to build larger micro coils (5-6 mm) with 30 ga Kanthal (so I could do more wraps) and again got around 1.5-1.6 ohms. HOWEVER, this time, the coils took forever to heat up. They really never even got to the point where they were glowing red. Regardless, I threaded a wick through and gave it a shot. It sucked. Poor vapor production unless I held the firing button down for like 5-6 second.

Now, the problem seems to be the fact that I'm using an iTaste VV and it just doesn't seem to pack the power I need to run dual coils. I've got an HCigar Nemesis clone on the way, and I'm excited to try it out. Been reading up on mechanical mod stuff, safety, how they work, etc. for a week or so, plus I'm a graduate engineering student (I'm not an idiot).

But I wanna know why this happens. With both dual coil builds I had the same amount of watts/volts/amps running through my setup. Is it simply that there was more wire to heat up and it took longer?

Now I've got a 1.9 ohm 3 mm micro coil on this bad boy and I've got it positioned just right to give me really nice flavor and vapor, and this is doin the trick until my Nemesis arrives.

 

[Rodeorat]

your problem is likely your coil diameter more than anything. 3mm coils are not micro coils at all. A true MC needs tight wraps around a tiny diameter...1.6mm and lower. A mini coil would be around 1.7mm to 2.5mm.
Frankly, I wouldn't use 32ga on any micro/mini coil. Too small and limp to hold a tight coil. However, you could tightly twist 2 or 3 strands to give you the action of 28ga or 30ga.
I run all of my coils around 1.7mm in diameter, 2mm tops. Give it a shot.

 

[Rodeorat]

Have you seen this microcoil chart yet?

 

[rdeezy74]

Ah nice, that's cool. I just measured the screwdriver I've been wrapping on and I think mine were closer to 2 mm actually, and my second dual coil attempt was closer to 3.5-4 mm. So a larger coil diameter takes longer to heat up? Why?

Edit: I also have an Excel sheet I made that lets me plug in the ohms I'm going for, the diameter, the Kanthal gauge, and the lead lengths and it will tell me how many wraps I need to shoot for.

 

[Rodeorat]

Ah nice, that's cool. I just measured the screwdriver I've been wrapping on and I think mine were closer to 2 mm actually, and my second dual coil attempt was closer to 3.5-4 mm. So a larger coil diameter takes longer to heat up? Why?

Simply takes more wire to wrap a bigger diameter coil. Additionally, you're using 32ga, which is a higher resistance wire. Edit: I reread and see you did try 30ga, but still, its only slightly larger wire, and your coils are too large.
Since the wire is so thin it doesn't carry as much heat transfer as a larger wire would, so you'd really need a very tiny coil, less than 1.5mm for the wraps to heat each other. The mechanics of a MC use the adjacent wraps to build up heat on each other. So larger wire, more radiated heat. you need a tight coil of heat.

 

[rdeezy74]

Simply takes more wire to wrap a bigger diameter coil. Additionally, you're using 32ga, which is a higher resistance wire.
Since the wire is so thin it doesn't carry as much heat transfer as a larger wire would, so you'd really need a very tiny coil, less than 1.5mm for the wraps to heat each other. The mechanics of a MC use the adjacent wraps to build up heat on each other. So larger wire, more radiated heat.

Thanks, that makes sense. So even at the same resistance, more wire + thinner wire would not heat up as efficiently. I've got some 28 ga Kanthal on the way and I'm excited to try some dual coils!

 

[k702]

think of it as using a torch to heat up a finishing nail vs a rebar tie rod. one is bigger and will take longer to heat. You also want to make sure you get the coils nice and tight together if you're going to be wrapping them that large so each wrap can help the next heat up. But like was already said I wouldn't wrap that large with 32 g.

 

[Rodeorat]

Since you have 30ga on hand, try a 9 or 10 tight wrap on a skinny jewelers screwdriver, 1.6 or 1.7mm. You'll hit around 1.8-2ohms and should give you a great vape.

 

[sawtoothscream]

when I make a dripper for the zmax I do 9 wraps of twisted 32ga on a 5/64 drill bit. just a single coil and comes out to about 1.7

it heats fast and blasts fat clouds at 6v. Give that a shot, im sure 9 wraps of 30ga will do about the same.

 

[vapdivrr]

Even at the same resistance, a smaller diameter coil with more wraps will heat up faster then a larger coil of the same resistance with less wraps. I think it's because of air around the coils, there is more air around a larger coil thus cooling it maybe faster. Also more wraps of a more condensed coil should transfer to the other coils faster. That's my take on it anyways

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