Why sub ohm? clouds can be made over 1 ohm

[peter12]

Still new still in experienced.

But why go sub ohm? I mean I've tried down to .3 and up to 1.8 and can get similar vapour amounts from both. Flavour doesn't seem.to change massively. Although in.order to compare I do have to use different attys so I can vape both at same time and see comparison

Maybe I build wrong coil style or size. So maybe the fault is mine.

I think i understand higher watts need lower ohms. So that part makes sense.

[VapingBad]

The term "sub-ohm" only really makes sense with regulated mods and always causes confusion. I have been "sub-ohming" for a couple of years but only "cloud chased" a handful of times (it's no for me).

[peter12]

So what are the benefits of making coils at .3 or .4 compared to 1.2 or whatever

[VapingBad]

On unregulated devices you get 3 or 4 times the power, on regulated devices having the resistance too far in either direction can mean that it wont fire at the selected power because it would require going beyond the min & max voltage limits or max current limit, other than that ohms alone are not important. But with the pre-built coils made at various levels, lower ohm generally have larger coils with more airflow. It is really about the amount of contact area between the coil and wick, wicking and airflow and it is easier for them to build with thick wire and the coil is more robust and this results in low resistance.

[phatfil]

afaik lower ohms = bigger coil + bigger surface area = capacity to produce more vapour and will need a bigger wick to provide the juice..

[VapingBad]

Sept 7, 2015 12:59:34 GMT phatfil said:

afaik lower ohms = bigger coil + bigger surface area = capacity to produce more vapour and will need a bigger wick to provide the juice..

But you can do it with thinner wire as well.

EG 3 mm coils optimised for 50 W

10 wraps of 0.6 mm Kanthal 0.7 ohm
13 wraps of 0.5 mm Kanthal 1.25 ohm
17 wraps of 0.4 mm Kanthal 2.4 ohm


They are all around 190 mW/mm²

[peter12]

Wow all this is over my head

So thicker wire provides more resistance and will need more wraps. As such you can get more vapour and flavour in general?

So coil design plays a large role then as well as wrap amount and wrap size?

[peter12]

Just made a 1.9 coil wrapped around a 2 ish mm screwdriver. 10 wraps dual Coil. 24 guage kanthal no idea what this is in mm sorry Produces pretty decent flavour and vapour at 25 watts

Edit vapour isn't quite as dense tho. And flavour seems to have lost quite a bit of its mintiness after a few draws

[Deleted]

a lot of atomizers are designed to be built sub ohm apart from that it's a more satisfying vape imo, as has also been mentioned ability to use thicker gauge wires = more surface area = more flavour = better vapor production = a warmer vape without feeling like your sucking a melon through a straw. Plus more power in a mechanical device the ability to use batteries and mods to their full potential.

[VapingBad]

Sept 7, 2015 13:47:56 GMT peter12 said:

Wow all this is over my head

So thicker wire provides more resistance and will need more wraps. As such you can get more vapour and flavour in general?

So coil design plays a large role then as well as wrap amount and wrap size?

Yes, don't worry about understanding the detail, like most things with coils there are many good solutions for a particular need and it is often best to try what others find good it a particular atty running the same power level as you like. 

It is easier to spot the effect of insufficient contact area with temp limited mods as the temp limit will cut in too soon.  Unfortunately due to poor advice on temp limiting and wire gauges and the min resistance limit of many mods there are a lot of people just turning up the temp limit when they would be better adding surface area or airflow.  As long as you understand that more contact area and or more airflow allow to run more power and vice versa don't worry about the maths, wicking is obviously important as well, but it is much easier to identify.

[peter12]

I do find thicker wire easier to deal with by far. So will probably leave the other wires alone for now then. This will likely keep me under 1 ohm as in not great at coiling so can't do lots of wraps

Wicking is a tricky issue. To much or to little and you can't vape properly. I struggle alot getting the balance and often end up with too little or too much and then get dry hits or flooding the coils which is just as bad as I get hot juice spitting in my mouth.

[VapingBad]

It took me ages to get the wicking right on some atties peter12 you are not alone on that one, thicker is often easier, really thick Nichrome is meant to be easier than Kanthal. Personally on the rear occasion I use Kanthal I prefer thinner wire for faster heat-up and cool-down, but that is just my personal preference,

[phatfil]

Thats pretty much where ive landed peter12..

less is more when it comes to wicking, if using organic cotton pads, if you cant tug the wick back n forth under tension inside the coil without it tearing or pulling the coil out of shape, your using too much


fwiw in my limited experience
while some utubes etc will suggest 3-6mm width of a cotton pad to roll to wick a coil 3-3.5mm in diameter
i would suggest more like 2mm of a well expanded pad,,

rolling with the palm of the hand of a paper towel in one direction (ie away ) on a flat surface is the easiest way ive found to get an even roll from a slice of a cotton pad.

[Deleted]

It is strange how we all favour different ways of wicking with cotton ... I don't bother rolling (other than tightly rolling one end for initial threading) and just tease the cut cotton back and forward gently trying to keep the looseness in the fibres.

[VapingBad]

I have always found the easiest way to perfect your setup is to have 2 of the same atty and a-b compare your changer, reject the least favourite and go again.