Do your coils ever go UP in resitance after use?

[conanthewarrior]

Hi people. I made a coil for my lemo with fairly high resitance, I made it 1.8 ohm as the nautilus used that and got great flavour, so I thought I would give it a go.

The first 2 coils I made proceeded to change from 1.7 to 1.2, then the third 1.8Ohm on the reader and on the SIg30 was 1.8 for the first 2 days, then it jumped to 2 ohms. How exactly has this happened? Is it the grime that accumalates on a coil caused this? Very strange indeed though, I have checked everything is tight and it is, but this coil I built to 1.8 ohms, that worked at 1.8 ohms, is now 2 ohms.

PS: I get great flavour at about 11-14 watts, with not bad clouds either quite surprising.

 

[Zamazam]

If you have coils changing that much, jumping around from 1.7 to 1.2 then 1.8 it's either a crappy ohmmeter, or a build that has a short in it somewhere. Sometimes a coil with an overlapping wire on the wind will cause that. As it heats and cools the overlapping wire will lose contact with the rest of the coil and add a bit of resistance because it is now a longer section of resistance wire. Make sense?

Pay attention to the leads coming off of the coil in the Nautilus head rebuild. Even though one is negative polarity, if it touches the side of the coil head chamber (also negative) in multiple areas, when the wire heats, it expands and changes they way it may touch the sides of the coil head. Hope this makes sense.

The factory coils are made with NR-R-NR wire, Non Resistance - Resistance - Non Resistance. They take a coil and fuse non resistance wire to the short leads on the coil thus eliminating some resistance inconsistencies and preventing the insulators from getting degraded with heat over time.

 

[UncleRJ]

Build up of crud can effect the resistance of the coil.

Every so often I take a look at the display to see what the resistance is and if it changes by 0.2 ohms I know it is time to dry burn the coil and replace the wick.

 

[Zamazam]

can't do that in a Nautilus head rebuild.

 

[conanthewarrior]

Sorry- to clarify It is a lemo V2, not a nautilus, I chose 1.8 as that is what the nautilus used, was experimenting. Must be crud build up then, and the other 2 must of shorted to 1.2 ohms. I have rebuilt nautilus BVC heads, but find the genuine ones to be better in flavour.

I will use this tank of juice (nearly full, will take a while at 12 watts lol) then give the coil a clean and a quick re wick. I think the Ohm reader is fine, as it displays the same as on the sig-it was after about half hour of vaping they dropped which confused me.

Must be a short like you said, and the heating and cooling does make perfect sense. I do wrap my coils tightly touching, so it is possible a wrap was over another.

If it goes back up to 2, I will do another coil with one or 2 less turns, as 1.6-1.8 is my aim.