resistance jumping with russian 91

[Jeffk123]

Hey guys
Well I have had my russian for about a month or so and I love it but recently it has been misbehaving. I use 12 wraps of 28g on a 20g syringe needle ohms coming to about 1.2. But after vaping awhile the resistance will jump around since im using a device with an sx200 chip it gives me a bad burnt taste. The resistance has jumped up as high as 6 ohMs and that makes my sigelie push like 8.5 volts through yikes roasting coil juice and wick.
Any thoughts or suggestions?

 

[oedo808]

I had the opposite issue with a kfl+ clone, resistance was dropping from an ohm to .18. I was able to fix it by pulling out the center 510 and underlying pin that holds down the positive block and reseat everything.

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[Miata GT]

It sounds Like one of the ends of the coil is loose or that one of the sides of the mounting block is loose.

 

[PoeDung]

+1 for pulling out the center connecting pin. Same thing was happening to mine and that fixed it.

 

[Jeffk123]

Ok I will break it down and put it back together see if that will fix the issue thanks

 

[Steamer861]

Same thing happened to me Center post was loose and moving around
I removed ajustable screw and really gave it a good tightening all good now

 

[dice57]

A common occurrence for ohm swings is the terminal post screws not being tight.

 

[horton]

The center pin is most likely the culprit, but also wanted to mention something else. I had a coil that was changing resistance and came to find out that one of the wraps in the coil was broken but still making contact. It finally "broke" when I tore the device down and took the coil off -- I could not see the problem until I loosened one of the screws and then it was very apparent.
The coil was a few weeks old and I never considered wire failure as a problem. Was using 30ga Kanthal and cotton.

 

[carrielsal]

You have a loose connection. I had the same problem when I got my first Russian 91% and it nearly drove me nuts.

Remove the center screws, #18 and #19. Check the base insulator, #16, and make sure it's seated properly inside the screw hole.
Hold the positive screw block to the negative screw block with a pair of needle nose pliers so it doesn't move, then tighten the center screw, #18. Then reinstall screw #19.

 

[Jeffk123]

Took me awhile to get back to this but your suggestions cleared out the ohm swinging about yay. I have officially decided 28g in the russian is a no go too thick and burns too hot anyways thanks for the help guys

 

[carrielsal]

Took me awhile to get back to this but your suggestions cleared out the ohm swinging about yay. I have officially decided 28g in the russian is a no go too thick and burns too hot anyways thanks for the help guys

Really? I have 1.4 ohm micro-coils made with 28G kanthan in both my 91%'s, and they're perfect. They are also very durable. Sometimes I get impatient removing the old wick and the coil gets bent. I just dry burn it and push the coils back together with a pair of tweezers.

 

[suspectK]

^yeah, I use 26awg with a 2mm inner diameter.

If it's too hot, I would think about wrapping on something larger. I like 26awg, cuz I get 7 wraps for ~0.7 ohms on 2mm.. perfect surface area for my tastes.

 

[Jeffk123]

I had been wrapping it on a 5/64 drill bit but it seems like my cotton cant keep up with the rate at which the juice vaporizes I never had that problem with 30g kanthal

 

[carrielsal]

I had been wrapping it on a 5/64 drill bit but it seems like my cotton cant keep up with the rate at which the juice vaporizes I never had that problem with 30g kanthal

I use a jeweler's screwdriver to make my coils which is about the same size. Could you be using too much cotton? I roll mine a bit before running in through the coil. I pull the ends straight up, then screw on the chimney base. I trim the ends of the cotton just a few mm's higher than the top of the chimney base, then use a syringe tip to push the ends down on the deck. I have tried wetting the wick and placing on the deck before installing the chimney base, but the ends of the cotton always moved when I installed the chimney base.

 

[Jeffk123]

I use a jeweler's screwdriver to make my coils which is about the same size. Could you be using too much cotton? I roll mine a bit before running in through the coil. I pull the ends straight up, then screw on the chimney base. I trim the ends of the cotton just a few mm's higher than the top of the chimney base, then use a syringe tip to push the ends down on the deck. I have tried wetting the wick and placing on the deck before installing the chimney base, but the ends of the cotton always moved when I installed the chimney base.

Thats the way I do it maybe I will try it again after my current coil burns out. Thanks

 

[carrielsal]

Thats the way I do it maybe I will try it again after my current coil burns out. Thanks

I change my wick out every time I fill my tank. I'll probably need to fill one tonight. I'll take some pics for you.

 

[horton]

carrielsal is making me feel like a vaping slob....lol. I only change my wick when I have to or roughly a week has passed with no burning. Actually, I'm doing "research" on cotton wick longevity..... NOT.