Please help if you can MTL

[sisera]

Hello
I have a wired MTL issue that is happening to me for 7 years, please help me if you can, i would be really really thankful.
First, every thing is the same, the wire i use, the wick, the wraps, the diameter, the liquid, the mod and the tank
I make MTL builds which is ordinary, nothing special with it, BUT, every 10 or 20 builds, without knowing the reason or the secret i make that build that's really magical, the MTL hit that i want,it's like a refreshing hit that makes the world beautiful again, and after the coil expires ( 7 to 12 days of intensive using ), i don't know the reason how to make the same again ?! , as i said every thing i use is the same, but the only repetitive sign of that coil is when i change the wick after a day of using, i find the wick already cut to half from the center of the coil !!, if you an MTL vapor and you have experienced the same or you were able to solve the puzzle and know the secret, please help
Thanks for the long time to read my problem.

 

[Mordacai]

Also @sisera, if you haven't got the tails of your wick right that won't help either.

Too long and or too much in the tails and you choke the liquid flow.

Too little and or too short and you end up with the build deck flooding.

What ID (Internal Diameter) coils do you use though, and how many wraps?

 

[sisera]

Wicking any RBA is a total "feel" thing. Once you know the "feel" of a good fitting wick in a coil you can reproduce that every single time.

Rule of Thumb with Wicking: Too little = gurgling/flooding. Too much = dry hits/muted flavor.

Ideally you want a cotton wick to be tight fitting within a coil when moving the wick side-to-side. But NOT too tight. The wick should move side-to-side within a coil while feeling some friction. And absolutely, not loose fitting within a coil. Again, it's a "feel" thing.

If using rayon for wicking, you need to use ~30% more density versus cotton. That's because rayon contracts (cotton expands).
As noted in both rayon threads, you want a rayon wick to fit tightly (not too tight). You should hear some squeaking as you pull rayon through a coil.

I switch off between using cotton and rayon in all my RBA's.

Thank for your reply
( a cotton wick to be tight fitting within a coil when moving the wick side-to-side. But NOT too tight. The wick should move side-to-side within a coil while feeling some friction. And absolutely, not loose fitting within a coil. Again, it's a "feel" thing )
I absolutely understand this, and I'm very good at it, the wicking was never a problem, it's very straightforward for everyone.
I think maybe it's about tighten the screws
Because after that the dry burn and i do it with the same power every single time, maybe i should tighten the screws to the end ?? Or just a little bit ?
Thanks.

 

[ShowMeTwice]

Yes, looks black

If your wick is black (or charred) when you pull it that is a Sure Sign of Too Much wick inside the coil.

That would also explain the muted flavor.

Use less wick.

You want the wick to be firm inside the coil, not too tight though.

 

[sisera]

Also @sisera, if you haven't got the tails of your wick right that won't help either.

Too long and or too much in the tails and you choke the liquid flow.

Too little and or too short and you end up with the build deck flooding.

What ID (Internal Diameter) coils do you use though, and how many wraps?

Always 2.5mm
And with kanthal 26 i do 10 wraps
With the vandy vape superfine 30g i do 6 wraps, never make a spaced coils
I only smoothly hit the coil with a metal tool while burning it to catch the hot spots and i always do that,
Please, tell about tightening the screws
I find YouTube vapers ( mike vapes ) tighten it to the extreme. Is that a mandatory thing ?

 

[sisera]

If your wick is black (or charred) when you pull it that is a Sure Sign of Too Much wick inside the coil.

That would also explain the muted flavor.

Use less wick.

You want the wick to be firm inside the coil, not too tight though.

You reversed it, when that happens i get the best build and the best hit and vape density and flavour, that is what I'm looking for

 

[sisera]

A coil should last much longer than 7-12 days even with non-stop use.

My coils last for months.




Why are you replacing the wick after one day?

Are you vaping NET juices (naturally extracted tobacco)?

What kind of juice(s) are you using?

My wicks last 15 days with flavored DIY juices and one month with flavorless. When I remove a wick it is never burnt or blackened from the coil.




I'm not understanding what you mean. Please explain.

When you say your wick is cut in half is your wick fried/burnt when you pull it?


It would be very helpful if you posted a couple photos.

I feel like an alien !!
Months for coils and 15 days for wicks!!
Didn't happen to me even with the pre-made coils for subohm tanks at the beginning

 

[Mordacai]

Okay 2.5mm, that's the kind of info we need @sisera.

So that'll be a 7.5mm strip cut from a pad, then the outer layer stripped both sides. No less cut than that.

As for tightening screws, best practice is what you need to do the job. As overtighening creates weak points and messes with the resistance.

 

[Izan]

Thanks for your reply
I use berserker 2 MTL RTA
Kanthal 26g
10 wraps on 2.5mm
And regular cotton sheet
12mg MTL tobacco liquid
I tried to upload a photo but the website said it's too large
That's all.

In your place, I would change to a 7/8 wrap K1 28awg at the same 2.5id. (10wraps seems excessive)
I presume you are using a contact coil; add a whisper of space between the 28g wraps and begin the wicking trials once again.

If you are using a regulated device, you need not worry about the coil resistance in relation to 1 ohm and above =MTL and sub ohm = DTL.

Build to your device and adjust power and airflow as needed.

Hope that helps

Cheers
I

 

[ShowMeTwice]

Months for coils and 15 days for wicks!!

I have a few RTA's that I've used the same Clapton's in for nearly 6 months. They're SS316L. The Clapton wire I use is on a spool. I don't use premade coils.

One of the folks who makes custom coils has shown that a SS316L coil can last a very long time, as in many months, with proper care.

My cotton wicks last 15 days with my DIY juices - and I should mention - none of my juices use tobacco flavors or NET's. I very rarely use any sweeteners in my juices. Most of the juices I make have less than 10% total flavoring. Many use less than 5% due to using flavors that are ultra concentrated.

 

[ShowMeTwice]

Please, tell about tightening the screws
I find YouTube vapers ( mike vapes ) tighten it to the extreme. Is that a mandatory thing ?

Tightening the screws to the extreme is not recommended.

You never want to Gorilla tighten the screws on your build decks. Why? Because eventually a screw will break.

Each time I rewick I check the screws. Sometimes one will need a little tightening.

 

[sisera]

Tightening the screws to the extreme is not recommended.

You never want to Gorilla tighten the screws on your build decks. Why? Because eventually a screw will break.

Each time I rewick I check the screws. Sometimes one will need a little tightening.

I appreciate you time and efforts

 

[sisera]

In your place, I would change to a 7/8 wrap K1 28awg at the same 2.5id. (10wraps seems excessive)
I presume you are using a contact coil; add a whisper of space between the 28g wraps and begin the wicking trials once again.

If you are using a regulated device, you need not worry about the coil resistance in relation to 1 ohm and above =MTL and sub ohm = DTL.

Build to your device and adjust power and airflow as needed.

Hope that helps

Cheers
I

I appreciate you time and replies

 

[Falconeer]

Maybe out of left field as usual, but I wonder if you've hot spots in some of your coils - I'd look first at dry burning and scraping them and then pinching them together with ceramic ( never metal) tweezers.

 

[mcclintock]

Sounds like the wick never got fully juiced before trying.
That said, I've never been able to build a tank RBA satisfactorily, only drippers and rebuilding EVOD coils.

 

[sisera]

Maybe out of left field as usual, but I wonder if you've hot spots in some of your coils - I'd look first at dry burning and scraping them and then pinching them together with ceramic ( never metal) tweezers.

I do scrape the hot spots but never pinching
Thanks.

 

[sisera]

@All
I would like to say thanks for all your efforts and time to help me, i really appreciate that, God bless you all.

 

[sisera]

An update
Hello, i hope you all are doing well and enjoying vaping
I have tried something weird about my MTL issue that i would like to discuss it with you
I thought about every single step in my coil building process and i decided the issue is about tightening the screws and dry burning the coil ( for the first time ), and i tried to make a coil and not tighten the screws for even the normal ( i stop tightening at the first sign of resistance, but the coil is stable in place ) and i worked the first time i got an amazing 2 weeks of vaping , and it worked for the next coil also, i thought finally i have found the secret , only to realize i have made a type I error, in the next 7 coils it didn't
( forget the 2 pieces cut in the wick that i have mentioned, it happens only while using ni80 or kanthal, i use superfine fused clapton 30g here and for 1.5 year and the same issue about the build exists )
The main point that i realized is that, i watch mike vapes and other on YouTube, i found that they are tightening the screws to the maximum possible point !!!, regularly i tightening easily to the middle not like that
Tell me please how or what is the right way to tighten the screws or is that has anything to do with this issue ?

 

[Mordacai]

@sisera I think you may want to try a little less cotton through the coil, as cotton swells when wet. And that has the possibility to impede on the wicking ability.

If you don't have any joy with that idea it may be an idea to try rayon for wicking, as it shrinks slightly when wet and wicks more effectively due to the much longer fibres.

 

[ppeeble]

One question - when you find that the wick has separated into two pieces, is that happening after you have experienced a good vaping experience or is it the opposite ?

 

[sisera]

@sisera I think you may want to try a little less cotton through the coil, as cotton swells when wet. And that has the possibility to impede on the wicking ability.

If you don't have any joy with that idea it may be an idea to try rayon for wicking, as it shrinks slightly when wet and wicks more effectively due to the much longer fibres.

I will try
Thanks for your help.