Just discovered ohms apparently increase over time?

[Zach904]

So a week ago I wrapped a microcoil measuring 1.3 ohms. Used it every day on a kayfun lite plus. Put it in "drip" mode several times to swap out liquids quicker. I used a toothbrush to brush the coil, dryfire, brush coil and dryfire. Doing this and soaking in warm water seems to really help to get rid of any remnants of old flavors. On a whim, I decided to see if I was somewhere around 1.3 ohms still... It was 2.79 ohms I have kept all my coils in a safe range between 1.3 to 1.6 ohms using sony 30 amp 18650 batteries on a nemesis clone. I guess I never saw anywhere that coil ohms will fluctuate over time. Was I in any danger having that high of ohms? I tested the battery at that time and it was at 3.58 volts. I was planning on changing battery fyi, I knew it was getting low.

 

[Paul.K]

Hmmm could it be that while brushing you loosened up your coil wrap a bit? Did pinch your coils after dry firing? (I'll assume you have compressed micro coils). Mine does not change and my coils stays in for at least a month if not longer.

 

[Nataani]

Yep - Over time the wire reacts with all sorts of stuff; the juice, oxygen in the air, etc. Not to mention flaws that are exacerbated by the constant heating and cooling.

In the end this results in some parts of the wire where conductivity is less due to a chemical change in the wire, or the wire is made thinner by corrosive effects or flaws as mentioned above.

This is why you cant simply re-wick a coil forever. Eventually you will need to change it.

 

[Ryedan]

So a week ago I wrapped a microcoil measuring 1.3 ohms. Used it every day on a kayfun lite plus. Put it in "drip" mode several times to swap out liquids quicker. I used a toothbrush to brush the coil, dryfire, brush coil and dryfire. Doing this and soaking in warm water seems to really help to get rid of any remnants of old flavors. On a whim, I decided to see if I was somewhere around 1.3 ohms still... It was 2.79 ohms I have kept all my coils in a safe range between 1.3 to 1.6 ohms using sony 30 amp 18650 batteries on a nemesis clone. I guess I never saw anywhere that coil ohms will fluctuate over time. Was I in any danger having that high of ohms? I tested the battery at that time and it was at 3.58 volts. I was planning on changing battery fyi, I knew it was getting low.

That's a lot of resistance increase in one week. I would check the connections. I've never had a rebuildable coil go up anywhere near that much and I've used coils occasionally for a couple of months.

 

[Visus]

Additionally:
check your 510 for oxidation it also will ramp up a coils resistance
keep your connector clean
A very good cleaner is a magic eraser for cleaning walls and such
it gets all the nooks and crannies

 

[Zach904]

Thanks for the input everyone.. I remember brushing the coil loose off of one screw and screwing it back in.. I brushed pretty hard on the coil and did not ever re-compress the spring after the initial set up.. Ill be sure to clean the 510 connector as well. I put a new coil on measuring 1.5ohms and decided to see what it was rated after filling up the tank with liquid.. It jumped up to over 7ohms (cant remember exact). Does a full tank give a different rating? That was this morning, and I just decided to check the ohm rating now with the tank almost empty and it says 2.58ohms.

 

[deanthemachine]

Thanks for the input everyone.. I remember brushing the coil loose off of one screw and screwing it back in.. I brushed pretty hard on the coil and did not ever re-compress the spring after the initial set up.. Ill be sure to clean the 510 connector as well. I put a new coil on measuring 1.5ohms and decided to see what it was rated after filling up the tank with liquid.. It jumped up to over 7ohms (cant remember exact). Does a full tank give a different rating? That was this morning, and I just decided to check the ohm rating now with the tank almost empty and it says 2.58ohms.

Bro you are doing something wrong. No way you should see fluctuations like that. A little resistance increase (.1 -.2) over a long period of time is normal but what you are seeing is not normal. What are you using to measure ohms? I assume you are noticing it in your vape? Can you post a pic? I would like to see what a 7ohm coil looks like....

 

[Zach904]

Bro you are doing something wrong. No way you should see fluctuations like that. A little resistance increase (.1 -.2) over a long period of time is normal but what you are seeing is not normal. What are you using to measure ohms? I assume you are noticing it in your vape? Can you post a pic? I would like to see what a 7ohm coil looks like....

I wrapped a microcoil, 10 wraps around a 1/16 drill bit and mounted it.. rated at 1.5ohms on my little black Eleaf ohm/voltage tester. Filled it up with liquid, tested again and it said over 7 ohms. Came home and after all day it says 2.58ohms. I have been having a tight draw all day but I think its because I used too much wick and am partially blocking the channels.

 

[Zach904]

Just decided to check it again. 3.95ohms now... I haven't done anything to the tank.. put fresh batteries in and the dang thing say 4.08ohms, then 8.99ohms... its all over the place, I don't get it. Im going to finish vaping the last of this juice then test it disassembled with just the part that the coil is on tested. The ohm reader apparently works fine during the initial set up, it reads the ohms at what I expected (1.3 previous build, 1.5 this build). Maybe im not supposed to test a fully assembled kayfun?

 

[deanthemachine]

Hopefully someone with more experience than I can help you out because that should not happen on a properly wrapped coil. Not sure what type of rebuildable system you use but that along with a pic might help someone figure out your issue. Are you using a mech? I would worry a bit about my ohms jumping like that with no circuit protection.

 

[dripdaze]

It sounds like you have connection issues. I just rewicked my IGO today. It was the third time in as many weeks and the coil still measures .6Ω just like it did the day I made it and installed it.

 

[deanthemachine]

I have 3 KayFuns and I always test them fully assembled and filled and they are never different then empty or the first time I test. Only thing I could suggest is drain it pull out your wick and insert the drill bit in the coil. If you have a properly secured coil you should be able to lightly tug and it still be attached to the two screw posts. Also make sure you have clearance between the coils and the walls of the chimney -i.e. the coil not touching metal.

 

[Ryedan]

Just decided to check it again. 3.95ohms now... I haven't done anything to the tank.. put fresh batteries in and the dang thing say 4.08ohms, then 8.99ohms... its all over the place, I don't get it. Im going to finish vaping the last of this juice then test it disassembled with just the part that the coil is on tested. The ohm reader apparently works fine during the initial set up, it reads the ohms at what I expected (1.3 previous build, 1.5 this build). Maybe im not supposed to test a fully assembled kayfun?

I have tested all my attys fully assembled at the 510 connection and at the posts including my Kayfun and I always get correct resistance readings. That's not the issue. If your setup resistance was 9 ohms you would be getting no vapor. If you're getting vapor the resistance is less than 9 ohms.

If the resistance is less than 9 ohms when yor gear is telling you it's 9 ohms, something is wrong with the way you're measuring it or your ohm meter is off.

If the resistance of a 1.3 ohms coil actually changes to 9 ohms, there is something wrong with your setup in the atty. It is not a short, as that would reduce the resistance. IMO it's a connection that is adding that resistance.

All you can do is work it through carefully, one thing at a time. Hang in there, you can do this

 

[Zealous]

So a week ago I wrapped a microcoil measuring 1.3 ohms. Used it every day on a kayfun lite plus. Put it in "drip" mode several times to swap out liquids quicker. I used a toothbrush to brush the coil, dryfire, brush coil and dryfire. Doing this and soaking in warm water seems to really help to get rid of any remnants of old flavors. On a whim, I decided to see if I was somewhere around 1.3 ohms still... It was 2.79 ohms I have kept all my coils in a safe range between 1.3 to 1.6 ohms using sony 30 amp 18650 batteries on a nemesis clone. I guess I never saw anywhere that coil ohms will fluctuate over time. Was I in any danger having that high of ohms? I tested the battery at that time and it was at 3.58 volts. I was planning on changing battery fyi, I knew it was getting low.

I've had mine change by like .1 ohm but only after a couple months. There are times when the ohms READ higher but those times are always because the screws have come loose. If you're changing cotton regularly, over time you'll move the coils around a bit. Couple that with normal wear to the coil from use & the screws just loosen up. I'd check & make sure the screws are tight like they should be.

 

[Caffeine7]

Is it possible that the ohm checker you are using is not operating properly?

 

[TheKiwi]

almost absolutely certain its the centre 510 connection being loose. happens to be ALL the time, esp since I change my toppers around multiple times a day. try tightening the 510 connect and plop it back on to check the resistance. It happens a hell lot more with my Russians too just because of the seperate 510 connection design

 

[deanthemachine]

almost absolutely certain its the centre 510 connection being loose. happens to be ALL the time, esp since I change my toppers around multiple times a day. try tightening the 510 connect and plop it back on to check the resistance. It happens a hell lot more with my Russians too just because of the seperate 510 connection design

^^ This

I can't believe I forgot about that. Happened to me once and I got 9.9ohm on my vamo. OP, use a flat head screwdriver and tighten this from the bottom of the base

 

[CommaHolly]

this happens to me all the time,,,,,,,,,,,they called me crazy

 

[Bunnykiller]

sounds like a loose connection or a broken coil, sometimes the coil will break/crack in the middle and still "look" intact and being that the coil is close wound in most cases, still making contact to complete the circuit but giving you the fluctuating readings...
and besides, as the coil heats up, it will change resistance a tad.

 

[Annie56]

Those little 510 ohm checkers are fragile. I could not get an ohm reading, after a month. On anything. The multimeter still works.

I pulled on that pin in the center of the 510/ ego connection on the checker. Two teeny lead wires, one was completely snapped off.

Or like the others said, loose connection will do this too!!

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