Cotton yarn issue
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  1. #1
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    Default Cotton yarn issue

    Hello all,

    My first ever rebuild was fantastic.

    My subsequent ones have a problem: the yarn wick burns thus I get a burnt taste.

    Here's is the result after 4-5 3 second puffs. Left is the wick, right are the flavor wicks. As you can see those are burnt as well, both of them, although all are soaking wet with eliquid.

    Coil has 2.5 ohm and vaping it at my regular 7.5 W.

    cotton_yarn.jpg

    Any idea what I did right the first time and wrong all the next 3-4 rebuilds I did?

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    Super Member RubyRoo's Avatar
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    Not totally sure what's going on but I have some ideas. I think you might be using too much wicking material and you are suffocating your coil. Try using less cotton wick. Cotton expands as it saturates, so with cotton, less is usually more. Also, try boiled organic cotton balls as they have greatly improved my protank rebuilds. 1/16th drill bit with a small strand of twisted cotton ball as the inner wicking material. I use a tiny flavor wick as well on top as I'm currently rocking a teeny tiny nano coil in my protank and I don't want it to flood. Hope this helps!

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    Thanks, I'll try with cotton balls tomorrow first thing.

    Another question: if I managed to burn the rubber thingy at the bottom (clear burnt rubber taste, didn't twist the legs) I should just throw away the head or can I remove the taste of the rubber by just coiling a proper twist legs coil?

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    Super Member Subdivisions's Avatar
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    You shouldn't need to twist the legs. The stock coils aren't twisted and don't use non-resistance wire and they don't burn the gasket. The coil wire actually touches the body of the atomizer and the center pin which are both low resistance. The current flows through that metal before it even gets to the coil wire. The only time I've seen the gasket get burnt is if the coil is sitting too low and really close to the gasket or there is a bad connection somewhere. You could try cutting away the burnt piece of the gasket to get rid of the flavor. Otherwise it will always taste burnt

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    That doesn't look too burnt...looks brown not black.

    Which leg burned? The positive? Maybe double that one (but don't let it short by having wire hanging lose). You have to twist it together to get wire-to-wire connection and double the wire-width in that short run of the leg. That spreads the current for that leg for a bit until it gets to the coil. Trim the end close and well.

    IDK what device that is. Does the center pin (the positive) have a hole in it through the center of the pin? Or no?

    Also, you have to oxidize the coil to get rid of oils from your fingers too. That can leave a bad taste and a poor connection.
    Last edited by AttyPops; 10-30-2013 at 01:01 AM.
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    Yes, I am burning the coil thoroughly. In the picture you have a PT2 coil assembly.

    The burn is not on the inner wire (that goes through the gasket and is held in place by the center pin), the burn is on the outer wire that sits between the rubber and the rest of the metal body.

    The wires I trim by applying pressure on them and twist, there's nothing that hangs around.

    Now for the update: I recoiled a fresh coil head with cotton from a cotton ball. While there is nothing burning, I don't get any flavor as well and everything is very very airy, vapor production decreased as well. The coil is around 2.6 ohms and I am firing it at the max of my device (5V), so I guess I need to go much lower if I want the cotton to work (28 GA and 30 GA Kanthal are on the way to me, all I have is 32 GA right now).

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    OK. Now we talk gauge.

    The heaver the ga (lower #) the less resistance and also the more watts it takes to heat it to vaping temps.

    So it's not uncommon for people using 28 ga wire to wind a coil that takes 30 watts to heat. That's why most of the SLR stuff uses mechs...most APV's with circuitry can't put out the watts.

    Now, as to flavor, it's a general rule that lower voltage/watts = more flavor on a particular coil. To a point. Too low, and it won't vaporize well. Higher wattage on the same coil usually reduces flavor a bit but vaporizes juice faster.

    I guess I'm surprised it's the ground side. Hmmm. What devices are we talking about here?

    As to the wick....re-do the cotton. It should be touching the coil, but not too squished. It's harder than it sounds for some reason. I suck at cotton wicks. But they work if I fiddle with it a few times. Messy. :/ I've had them too loose and they didn't touch enough coil to vaporize the juice well. Too tight and they restrict juice flow.

    If you just crank the voltage rather than solving the wicking issue you WILL get burnt gaskets and probably burnt cotton too. It's the vaporization of the juice that cools the coil. So if that isn't working well all sorts of stuff can burn.
    Last edited by AttyPops; 10-30-2013 at 11:35 AM.
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    Quote Originally Posted by AttyPops View Post
    What devices are we talking about here?
    The device is an eVic. I also have an eGo Twist but never used it, I just bought it for backup.

    Later edit:
    Here, i disassembled it now, I guess I am in the category of too little wick. That should explain poor falvor and poor vapor production.

    cotton.jpg
    Last edited by phorumph; 10-30-2013 at 12:06 PM.
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    When it comes to cotton, less is generally more. If you feel a good amount of resistance when trying to remove the cotton from the coil, you're using too much. It shouldn't fall out of the coil when you tilt it sideways, but it shouldn't feel as if you're about to pull the coil from the head when removed either.

    When I rebuild I aim for 1.5-1.6 ohms max and coils are built on a 1/16" allen key or drill bit using 32 Gauge Kanthal - for micro-coils I step that up to 28-29. At that resistance, 10w works beautifully and I never have an issue with wicks burning. The flavor and throat hit is great and all around, it's pretty much perfect. That's for me, of course, and your experience may differ. It took me a while and a little experimenting to get it where I wanted it.

    That being said, at 2.5 ohms, 7.5w seems a bit low. You're slowing heating up the coil and when it does get hot enough to vape, you've already hit it with a varying level of heat + the heat generated during your 3 second puff. That's one of the reasons I stepped down from higher resistance coils, simply because of the time it takes to heat them up. Even an extra 1-2 seconds adds heat and at the 1.5-1.6 ohm range at 10w, there's no delay.

    Again, this is my experience. I would think with the eVic, yours would be somewhat similar.
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    Wow, I've gotta say your don't look burnt at all compared to what my cotton looks like when I go to remove it. Guess I'm burning the hell out of mine but it isn't affecting flavor (usually more noticable on darker or sweeter juices). I'm using a 1/16 drill bit, microcoil (10 wraps) of 30ga Kanthal right at 2 ohms. I use 100% organic cotton yarn (4-strand). I break this down and use 3 strands inside the coil and 2 small single strands as flavor wicks. Most of my juice is either 60pg so it's on the thinner side vs say a 100vg juice. Wondering if I should try 2 strands inside the coil? Hmmmm... Sad part is I've read others using all 4 inside same size coil I'm making..now that seems tight. I do twist the end of the cotton just enough to get a point, then gently pull it through and when I do there is just a minimal amount of touching (not tight, but does touch) so I "assume" I'm using right amount. Looks like it might be time to test 2-strand.

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