Russian 91% Driving Me Insane

[Snaeem155]

Hallo All,

Long time vaper new to rba's.

I am following all instructions to a tee yet every time I install a coil it says there is a short. coils read 2-2.27ohms resting on top of the posts but soon as I screw them down the resistance falls down below 1ohm.

I have tried building micro coils with 5 loops and 7 with the same end result. The diameter of the coil is probably around 2mm or less.

I'm using 24awg kanthal wire on an original Russian 91% powered by an Evic.

At the end of my tether really as I cant figure out what I am doing wrong, considering selling it on which is a shame as I haven't even used it once.

Any advice ?

 

[The Ocelot]

Sorry to hear you are having trouble. On my Kayfun style RBAs I use 28awg with ≈ 10 wraps around a 5/64 drill bit. I'm never quite sure exactly the number of wraps, since they are too small for my old eyes, so the resistance varies between 1.3Ω to 1.6Ω. I wick it with cotton. Something I have learned, but can't seem to get my head around is the lower the gauge number of the wire (which means it's bigger) the lower the resistance. It seems counter intuitive to me.

Rip Trippers can be an ordeal to watch, but if you turn the sound down until he starts building it's worth it. The first coil he builds is a simple horizontal coil.

https://www.youtube.com/watch?v=z7o7RFoTtw0

 

[Rangertrix]

Have checked to make sure that your positive insulator isn't melted or cut and that your center post is tightened down?

 

[Snaeem155]

Center post is tightened down as much as it can be without protruding too much through the middle.

I haven't checked the insulator albeit not having ever managed to fire it up I assume this would be ok?

 

[The Ocelot]

Another thing to look at are the negative posts. On my Svoe KFL+ the bottom of the screws are flat and works fine; but on my BE Kayfun, the bottom of the screws are rounded and I have to pay attention to make sure the wire is making good contact with the post.

 

[joelmora89]

make sure you use maybe 28guauge because the chiminey is touching the wire

 

[Snaeem155]

Having watched that video I do everything that he does but mine seems to short every time.

Truly baffled.

 

[Snaeem155]

make sure you use maybe 28guauge because the chiminey is touching the wire

I don't have the chimney on and it still shorts.

 

[The Ocelot]

I second trying 28 gauge wire.

I'm also not clear on what you meant by, "Coils read 2-2.27ohms resting on top of the posts but soon as I screw them down the resistance falls down below 1ohm."

What are you using to check the resistance and when does it short?

ETA: Sorry to keep posting video links, I'm sure you are sick of them, but have another. The first part is maintenance, but in the second he makes a nice coil.

http://www.vaperev.com/vaperev-edu/ (Click on the one "Maintaining your Kayfun.")

 

[Snaeem155]

I use the Evic to measure resistance.

So if I rest the coils legs on top of the post screws I get decent ohm readings.

Soon as I screw the coil legs down I get sub ohm readings.

 

[Snaeem155]

Also I have used 28 or higher awg (that comes with the russian) and I get the same shorting issue.

 

[The Ocelot]

I use the Evic to measure resistance.

So if I rest the coils legs on top of the post screws I get decent ohm readings.

Soon as I screw the coil legs down I get sub ohm readings.

I don't know what to say at this point. I attach the legs and screw the posts down before I take a reading.

 

[Rangertrix]

Is it an authentic Russian? If so, is it a version 1 or 2? If it is a version 1, remove the adjustable center pin and make sure the o ring is installed and not damaged. If it is a version 2, contact the vendor you bought it from as the spring loaded center pin has known issues and the manufacturer swapped them all out for a version 1 center pin.

 

[Rangertrix]

Are making sure the coil is raised and and not touching the airhole?
Other than that and having no pics to go by, I would check the center pin insulator located under the positive block.

 

[Izan]

Exactly please:
How many wraps of 24AWG are you using around your 2mm mandrel?

Coil wrapping | Steam Engine | free vaping calculators

Be Careful
I

 

[Rangertrix]

24 gage at 2 mm would require roughly 20 to 22 wraps to get 1.5 ohm.
Pics would be very helpful.

 

[Elizabeth Baldwin]

Post pics of your build and we can help you better.

You are not really going to get a proper reading until its screwed down good. I'd say 1 ohms is actually correct if that's after its screwed down to the posts.

 

[Double Helix]

Yeah I'd definitely be using 28 gauge or higher. The readings go sub ohm, because those are the correct measurements. I just wrapped a single coil with 24 gauge at about 8 wraps with the same specs you described and it ain't near 1.0 ohms. I assume you need to be above 1.2 ohm limit with your evic.

 

[skimmer02]

Your coils are possibly all actually running below 1.0 ohm with the 24 ga, and close to 1.0 ohm with the 28 ga. Try to build a coil that you know will be readable by your device (what? maybe 1.2 ohm?). Try 10 wraps of the 28 ga on your 2 mm. That should come out to 1.5 or 1.6 ohm. Don't set it on the posts, screw it down and see what you get. Your device should be able to read it. If it does, and it reads it at 1.5 or 1.6 or close, then you know you're alright. You may just be accidentally building quite low ohm coils. An ohmmeter could help here.

 

[slappy3139]

Yeah, you won't get an accurate resistance reading until the legs of your coil are securely fastened. The 2+ fluctuating reading you get before fastening the legs is an intermittent reading because you have a poor connection, that's why it's fluctuating and higher than after you secure your legs.