Fluctuating Resistance

[snork]

I'm loving my Odysseus but need to understand and solve one problem. I'm a neophyte with rebuildable atties, but the Ody has made it a snap for me to wrap real nice 1.8-1.9 ohm single coils time after time. Problem is that the ohms fluctuate wildly and frequently during use. Starts out 1.9, couple hours later I'm not getting enough vapor and I check it - 3.5, turn up the wattage. Then a couple hours go by and suddenly I'm burning it - 2.1, turn down the wattage. I really want to get my Ody off my VV device.
What do you think is going on? Are my coils moving during use, should I wrap it a little tighter? What sorts of things could cause this on brand new coils?

Thank you!

 

[keighles]

Im not an expert on this, but what may be happening is that the resistance wire and non resistance wires are not tightly twisted. When the coil heats up it expanded and is coming loose from the nr wires.
Can Someone else confirm or deny this theory?

......sent from my phone.

 

[urquidezj]

There is a short in there.

 

[jmarkus]

There is a short in there.

yep, as urq says...its a short.

 

[snork]

yep, as urq says...its a short.

Okay, then to what should I pay attention most when constructing the coil? Visually everything looks tip-top.

 

[keighles]

Like the other guys said, check to make sure that the nr wire going down the side of the ceramic is tucked nicely in the chanel. And the excess is trimmed off, that wire should not touch the body of the ody at all.

......sent from my phone.

 

[snork]

Will do.
If anybody has other thoughts and suggestions I'd appreciate it.

 

[jmarkus]

Like the other guys said, check to make sure that the nr wire going down the side of the ceramic is tucked nicely in the chanel. And the excess is trimmed off, that wire should not touch the body of the ody at all.

......sent from my phone.

exactly as keig said...make absolutely sure the positive wire (the one thats wrapped around the nut below the ceramic is completely covered by the wick and not touching any other metal parts.

 

[Vaporologist]

I'm sure you've already thought of this but make sure the wire loops of your coil are not making contact with each other anywhere.

 

[imeothanasis]

Maybe its the build in carbon snork. I measure my wire and its at 1,5 ohm. I meassure it again at the end of the other day and it is at 2-2,5 ohm. After vaping the same wire at 6 volts for 1 hour it came at 1,5 ohm again

 

[fright88]

Agreed if it is carbon buildup a dry burn cycle should help restore your origional resistance.

If it is a short here are a few things to check/watch.
- When connecting the posative end of the wire make sure the wire is completely under the wick and none is poking out. Also when you wrap it around the pin and tighten the nut don't leave any excess sticking out if you do it can ground out on the body even if you tuck it in it can work itself loose. I use to have this problem because I would cut the wire a little long to reuse the coil but found even when I bent it over it would stick out later.
-On the negative end of the wire again make sure the wire is tucked behind the wick untill it has to come out to connect with the grounding nut. I have seen some videos where people put the wick in the channel first and while this can work it can also cause the wire to ground out on the mouthpiece. What I do (and this just works for me YMMV) is put the negative wire down the thannel about 3/4 of the way and lay the wick over it and start screwing the ceramic housing on the base. When the base gets to close to the wire I pull out a little bit more and repeat till I get the base tightened to my desired spot then I screw down the negative nut. This way the wire mostly stays behind the wick and only pokes out where it needs to.
-Make sure your coil and wick are tucked in the channels nicely at the top of the ceramic. Sometimes depending on how you wrap the part where the r and nr wires meet can stick up if they do or they stick out to the side or something it can ground on the mouthpiece or body so try to get the wick and wire set nice and deep into the top channel.

Sorry for my long winded post hope it helps.

 

[snork]

With your help I can envision what the probable cause is. Since my coils aren't exactly works of art, particularly where the NR and R wires are twisted together, I need to concentrate on making that area neater, flatter, and more compact.
The one I'm vaping on right now has settled down and is vaping like a champ, but I think I know what I need to do in the future.
Thanks!

 

[wreimer]

I think that may be your problem. I could not get a functioning coil, until I clamped both ends of the wick in a helping hand and kept it taut, then wrapped the wire around it. I would invariable get the wire touching, or close to it, and cause a short. Once I kept the wick straight while wrapping it ( some push a needle through the centre) all my problems went away