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Anything I need to know about 0.7ohm build?

Discussion in 'New Builders Corner' started by Matty Vapes, Jul 3, 2018.

  1. Matty Vapes

    Matty Vapes Silver Contributor Member For 1 Year

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    I bought some 26ss/36ss clapton wire I think its 6 or 7 wraps and it came out to 0.7.. I've been vaping at 0.4ohms forever. So I'm just adjusting to the change. My voopoo is suggesting 30watts is that about right? I'm finding the flavor a little lacking I'm using a Zeus single coil RTA. is this a MTL build? That's not what I'm aiming for lol
     
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  2. Ralph_K

    Ralph_K Bronze Contributor

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    Maybe take a wrap out. Just guessing but 5 wraps might get you close to the .4 you're used too
     
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  3. Matty Vapes

    Matty Vapes Silver Contributor Member For 1 Year

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    I'm actually enjoying the vape I'm getting it's like the equivalent of a light cigarette.. lighter flavor lighter vapor but plenty of it. It's nice. It's not dense thick and warm..how would one achieve that kind of vapor?
     
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  4. Pegleg Meg

    Pegleg Meg Yarrr, me booty VU Donator Gold Contributor Member For 1 Year VU Challenge Team Unlisted Vendor

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  5. Pegleg Meg

    Pegleg Meg Yarrr, me booty VU Donator Gold Contributor Member For 1 Year VU Challenge Team Unlisted Vendor

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    What size rod are you coiling around?

    If you want more warmth then try a parallel build with that wire, take a long strand and fold it in half then coil the two strands together, 5 or 6 wraps
     
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  6. Matty Vapes

    Matty Vapes Silver Contributor Member For 1 Year

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    it's premade wre..it's a 3.5 mm
     
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  7. Pegleg Meg

    Pegleg Meg Yarrr, me booty VU Donator Gold Contributor Member For 1 Year VU Challenge Team Unlisted Vendor

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    You might stretch a couple out a little (on a bit) and then put them together
     
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  8. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    I think the problem is, the 26g SS core wire. Stainless steel is CONDUCTIVE wire... it takes more power to heat than a resistance wife. So you will need more power to heat the coil and shorter battery life. 26ga kanthal wrapped with 32ga ss (or fused clapton, 2x 26ga +32ga SS wrap) are excelent coils. The Kanthal heats 3x as fast for 1/3 the power of the SS. (faster ramp up / longer battery life)

    I think I am using 2x 24ga kanthal +32ga SS... fused clapton at about 115-140v ( but i like a fairly warm vape)
    using steam engine, you can compare power levels for various core wires. Just change in the wire type drop box.
     
  9. Th3_uN1Qu3

    Th3_uN1Qu3 New Member

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    The post above contradicts Ohm's Law. :eek: Since he's got 0.7 ohms with his SS coil it's obviously a resistive wire. If it were 100% conductive he would have gotten a short circuit and thus be unable to do anything with it.

    How fast the wire heats up depends on its thickness and how much power is applied. How good the heat of the wire transfers to the wick and the juice, depends on the surface area that is touching the wick.

    Clapton wire and any kind of twisted wire will always be slower to heat up than using parallel strands or ribbon to achieve the same surface. My SS coils using parallel strands of 0.35mm (~27AWG) wire heat up faster, and also cool back down faster than the stock Clapton coils, or the coils that i made using Clapton style wire.
     
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  10. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    All wires have some resistance, those with a low wattage requirement to heat the wire are "resistance" wires vs "conductive" which takes a great deal more power to heat, but conducts heat faster that is applied from an external source. This is why heat sinks are made from copper, or stainless steel rather than cast iron. This is also why most coil builders prefer to use kanthal as a core and wrap with stainless wire. The kanthal heats quickly under current but stainless steel conducts heat faster than kanthal.

    I agree the ohms law is a bit skewy but I went by what the OP said he was using. A Nichrome core would be pretty close to 0.7 at 6 wraps. (3.5id core).
     
  11. Th3_uN1Qu3

    Th3_uN1Qu3 New Member

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    Thermal transfer capabilities of different metals are a different can of worms, indeed. However, we are trying to heat a wick that is soaked in liquid. Heat transfer to the wick is never going to be perfect, the main factor in how efficiently we can push the heat from the coil into the wick is simply how much of the wire comes in contact with the wick. The wire material plays a lesser role than its shape.
     
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  12. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    Ok so given 2 identical coils, one using kanthal wrap the other using ss wrap, the actual shape of the coil would be identical in either case, therefore the amount of time the wrapping wire take s start vaporizing ejuice. Remember, you are not trying to evaporate the juice inside the coil, you are evaporating the juice trapped between the loops of the wrapping wire (which, incidentally, has a much higher surface area than the inner core. Therefore, the ability of the wrapping wire to conduct heat and start producing vapor, just like a stainless steel fry pan heats up and starts cooking your eggs than a cast iron pan does.
     
  13. HondaDavidson

    HondaDavidson Gold Contributor Member For 2 Years

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    In you example the are we matching wire lengths and wrap counts.... if so the Kanthal will require more volts to reach desire wattage then a the ss...
    Because the Kanthal will be much higher ohm.


    Sent from my SCH-I605 using Tapatalk
     
  14. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    In my example, the core wire and wraps are identical. Same power, same watts. The difference is ss wraps or nichrome or kanthal wraps. Stainless steel, as I said, transfers heat from the coil to the juice much faster than the other options.
     
  15. Ralph_K

    Ralph_K Bronze Contributor

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    Man your idea on frying pans is flawed. Thermal conductivity of stainless steel is 16 where as cast iron is 55. If they were the same mass cast iron would heat up faster.
     
  16. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    Hmm seems you are correct. However, if they were the same mass, the SS pan would be aprox twice as large. SS has less mass than kanthal per volume. In other words, given 32ga SS vs 32ga kanthal, ss has less atoms to heat per volume of the coil. Therefore SS actually has a lower density than kanthal so heats faster as there are less atoms to heat.
    On the other hand, I generally prefer kanthal as a core wire, since kanthal, being a denser metal, has more resistance so heats faster at lower wattage. (Bases on resistance.. 6wraps kanthal vs 19 wraps ss for the same resistance value)

    In another forum, we discussed ramp up time. One view was SS ramps up faster vs my holding firm to the fact that safety had to be considered..Ie.. 6 wraps kanthal at 0.15 ohm (30A on a 30A CDR battery) vs 6 wraps SS (say 0.06 ohm) which although would have a faster ramp up, would far exceed the CDR of the 30A cell. (If I remember correctly, it was something like 56A draw)

    But, my fry pan comparison probably wasn't the best, unless you considered the 2 pans were exactly the same shape and size. The cast iron pan would be much heavier... giving SS aprox 1/2 the mass of cast iron. (don't confuse mass with volume, volume being the amount of water an item displaces when submerged) Therefore if it takes 100 wraps of 34ga wire to make 1 clapton, the SS would have less mass per 100 wraps than kanthal or nichrome.
     
    Last edited: Sep 1, 2018
  17. bobnat

    bobnat VU Donator Gold Contributor Member For 1 Year

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    Now, that's a Freudian slip.
     
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  18. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    lol I keep thinking in ohms... 1 ohm kanthal vs 1 ohm stainless steel. Given the same ga of wire, 1 ohm SS is a larger coil so would need more watts. my bad

    It does tend to save me a lot of wasted wire though, since I start with the desired resistance and then build the coil to match it, I get very few coils that wont fire because "resistance to low"
     
  19. Pony Tail

    Pony Tail Bronze Contributor Bronze Contributor

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    4 week old post but that was funny. I saw that and just started laughing thinking to myself that my ex was ALWAYS resistant. :giggle:
     
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  20. JSpring

    JSpring Member For 2 Years

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    Trying to find MTL builders to chat with...
     
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  21. gopher_byrd

    gopher_byrd Cranky Old Fart VU Donator Gold Contributor Member For 4 Years ECF Refugee

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    They are around. @AndriaD is 100% MTL at 9 watts and around a 2 Ohm build. She's a nice lady who I'm sure would be able to help with any questions you may have.
     
  22. gbalkam

    gbalkam Gold Contributor Member For 2 Years ECF Refugee Reddit Exile

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    I started out building low watt M2L coils. I started with a Kanger toptank mini and mini RBA @ about 8 to 14 watts. (I only had 16 watts to work with on the vplum I had been using.)
     

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