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Yes it is normal to have to raise power on dual coils. If you think about it, dual coils are effectively a larger wire single coil.
So you have to raise the power to get it to vape, but when it does vape you get more vapor.
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I have a couple of clone ithakas coming. I'm rubbing my hands at that post
Well then, here's a couple more teasers to stoke your anxieties...
Your dual 1.8 ohm coil is actually 2, 3.6 ohm coils. That is what they are heating as.
You may pump the same wattage into a 1.8 ohm coil and a 3.6 ohm coil but you probably wouldn't pump the same voltage.
The VW reads it as a 1.8 ohm so it sets the voltage as that but it's working like 3.6 ohms.
How I hit dual nirvana was to see what wattage I liked my 2.8 ohm coil on a wattage chart and then went down the row to the 1.4 ohm column. Not my usual 6-ish ohms, it was 11-ish ohms to pump the same voltage through the 2.8 ohm coils as I would normally have them as singles while they were reading as 1.4 ohms.
I'm finding that the SVD can barely provide enough power for this thing, the coils are actually at 1.6ohms in tandem as shown on my Fluke meter. Ive got the SVD cranked up to 15w and it's almost vape-able now, but still coming up somewhat short. I'm going to have to get the coil resistance higher when I get my wire in the mail. I'm getting a little more interested in it now that I can see what is going on. In all likelihood, I'll probably end up only running a single coil rig on this; I'm not into the see-who-can-make-the-biggest-smoke-bomb game, I just want it to taste good and have a heavier body. The way this thing is now, it's overkill and I'm about to cough up a lung trying to vape it.
I never really got into dual coils with rebuildables, a single micro coil can provide more than enough vapor for me. Need to make sure to have air-flow aimed correctly at both coils.
The only thing I do with duals is to use two wires along one coil. With thinner wire it allows cutting the resistance in half, to get twice the wraps with the same resistance. Here's one I did using 2 different gauge wires, came out at about 1.1 ohm if I remember right..
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The only thing I do with duals is to use two wires along one coil. With thinner wire it allows cutting the resistance in half, to get twice the wraps with the same resistance. Here's one I did using 2 different gauge wires, came out at about 1.1 ohm if I remember right..
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You seem to be a bit confused
That does me no good in getting unconfused does it?
Perhaps I'm not the one who is confused.
When I asked about DC to figure out what was going with amps this seems to be the general consensus from multiple people.
I know for a fact 2, 2.8Ω coils run in
I finally figured out if I normally run a 2.8Ω at 6w that is 4.2v. If the power supply is reading that as 1.4Ω the same 6w setting will provide about 3v. If I crank it up to 11.5w it will now be supplying each 2.8Ω coil with the voltage similar to what I would be using with the 2.8Ω coils that it actually is. (All numbers are rough estimates because my chart doesn't have 1.4Ω or 2.8Ω but that's what my DC is and I don't feel like wasting time with a calculator to run these through.)
Or if it's not a VW, you set the voltage to what you would use for the single coil Ω and the wattage goes up because as far as the battery is concerned half the Ω are draining.
This normally isn't a problem with single coils and VW because the halving of the Ω doesn't exist.
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I've found the wattage set for dual coils gives the same vape as a single coil at the same resistance.
Running a 1.5 ohms single draws the same amps as running a 1.5 ohms dual. A 3 ohms single coil will draw half the amps as a running dual 3 ohms coils. Each coil draws the same amount of amps, so if you run two coils it will draw twice that, and the resistance is cut in half. Running a dual is the same as if you had 2 PVs with a single coil, and vaped from them both at the same time. Twice the power is drawn and twice the heat is produced (and about twice the vapor). Two 3 ohms coils with produce the same power as one 1.5 ohms coil, and about the same vapor production.. in theory.
Make sense?
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Running a 1.5 ohms single draws the same amps as running a 1.5 ohms dual. A 3 ohms single coil will draw half the amps as a running dual 3 ohms coils. Each coil draws the same amount of amps, so if you run two coils it will draw twice that, and the resistance is cut in half. Running a dual is the same as if you had 2 PVs with a single coil, and vaped from them both at the same time. Twice the power is drawn and twice the heat is produced (and about twice the vapor). Two 3 ohms coils with produce the same power as one 1.5 ohms coil, and about the same vapor production.. in theory.
Make sense?
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I did to. Problem was it was giving the same vape as a single coil.
At least once I started using lighter wire that could produce some vapor with lower voltage.
You either lost me or you don't have it right. Two resistors in
Dual 3Ω is 1.5Ω as far as the battery is concerned. That 1.5Ω and the volts going in is all the matters for the amps. Whether it's single or dual doesn't matter.
3Ω 6w = 1.41421a, 4.24264v
1.5Ω 6w = 2a, 3v
But the coils are still 3Ω coils whether you have one or two or twenty in the head. They're going to act like 3Ω coils.
To get them to the same 4.24264v when they're reading as 1.5Ω you need to have them at 12w, 2.82843a.
1.5Ω 12w = 2.82843a 4.24264v
Why would the same 3Ω coil suddenly work to your satisfaction with 3v just because you put two in there? If it does why don't you always run 3Ω coils at 3v?
Try it
Ohm's Law Calculator
That was essentially what I experienced with the lighter wire and 3Ω coils reading 1.5Ω and powering them as if they were 1.5Ω. But why bother with dual coils if you could do the same thing with lower ohms?
The two 3Ω coils powered as 3Ω coils produces MORE vapor and doesn't burn like a 1.5Ω coil would with 12w.
Here's the thread where I had it explained. It took me a while of reading and rereading with the DC in hand to finally get it and understand that by powering the 1.5Ω DC as a 1.5Ω single with watts I was running the 3Ω coils at half power to produce like a single 1.5Ω instead of two 3Ω.
http://www.e-cigarette-forum.com/fo...ssion/448016-explain-dual-coils-ohms-law.html
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I think we're saying about the same thing worded differently. Were you originally wondering why a dual at 1.5 ohms total resistance (each coil 3 ohms) needs more power applied than to run a single 1.5 ohm coil to get a similar vape?
I think you stated what causes the difference, that with a dual each coil is running like it normally would at a given volt setting. With one 1.5 ohms coil, that wire will run hotter at the same volts than each individual 3 ohms coil in a dual (which is also 1.5 ohms). But while the 1.5 ohms single is running hotter than each individual coil in the 1.5 total resistance dual, the dual is performing like two 3 ohms coils to give twice the vapor as one 3 ohms coil; which is a different experience than the 1.5 ohms single.
Put another way, the single set-up producing a hotter single wire versus a dual set-up prducing two cooler wires, but two of them. Raising the volts on the dual to match what you would normally use to run one of the wires, so that each coil in the dual heats as hot as if it was single, but doubling the vapor.
Keep in mind, I'm not trying to correct anything you said, just trying to sort it out in my own head.
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I think you stated what causes the difference, that with a dual each coil is running like it normally would at a given volt setting. With one 1.5 ohms coil, that wire will run hotter at the same volts than each individual 3 ohms coil in a dual (which is also 1.5 ohms). But while the 1.5 ohms single is running hotter than each individual coil in the 1.5 total resistance dual, the dual is performing like two 3 ohms coils to give twice the vapor as one 3 ohms coil; which is a different experience than the 1.5 ohms single.
Put another way, the single set-up producing a hotter single wire versus a dual set-up prducing two cooler wires, but two of them. Raising the volts on the dual to match what you would normally use to run one of the wires, so that each coil in the dual heats as hot as if it was single, but doubling the vapor.
Keep in mind, I'm not trying to correct anything you said, just trying to sort it out in my own head.
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Just remember ... resistance by itself isn't that meaningful, as you can reach the same resistance in different ways. So if you are not taking into account those ways, the analysis of coil performance will be incomplete.
I find it more appealing to run a single coil of thicker wire than to run multiple coils of thinner wire. Lower gauge, thicker wire takes more watts to heat up at a given resistance too. A 1.5 ohm, 32ga coil runs much hotter at 10 watts than a 1.5 ohm, 28ga coil. The 28ga coil needs more watts to heat up the same as the thinner wire, but that heat is spread over a bigger area to increase the vapor like dual coils do. About the same effect, but I only need to wrap and install one coil.
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Nice to meet you Blue!!... That's usually what I do too! I've already got a couple things in my FT cart.. LOL
It was me who was originally confused when I got this DC in the mail yesterday. In my mind, dual coils are absolutely no different electrically than single coils and that only resistance matters, and that is true... but only from the perspective of an electrical circuit. What I failed to take into account was the mass of the coil and more importantly, the behavior we expect from the coil... ie: getting to and staying at the same temperature as a single coil, but with twice the mass. If we turn up our PV with a dual coil on it until the coils are performing the same as the single coil with the same resistance, we are dumping roughly twice the load onto the power supply in order to get there.
I made the same mistake I think that confuses a lot of people. Resistors are generally used in an electrical circuit and the desired result is a certain amount of power being delivered after the resistor has done it's job. In vaping, we don't care about that, we care about how hot we can get the resister (which in our case, is a coil)... it's hard sometimes to break that mindset. I knew I needed the coil to get hotter, but I was thinking from an electrical design perspective. I kept thinking to myself "what the heck, 1 coil or 50, it's still 1.6ohms. The battery can't see how many coils I have or how many wraps it is, it just sees 1.6 ohms! Why on earth do these coils want more power?" Myk's post finally moved my two remaining brain cells to rub together and create a spark and then I realized my mistake.
I could confuse the matter further by bringing into account the added mass, surface area and environmental factors that affect the temperature of the coils and require us to use actually more than double the power , but it's best to just tell people to turn it up until it tastes right...
The 37 dollar SVD on fast tech only comes with the short tube? Or does it have both?
The 37 dollar SVD on fast tech only comes with the short tube? Or does it have both?
The express kit comes with the short tube only, but you can still use 18650s with the short tube, so the long tube is unnecessary unless you want to stack two 18350s.
The full kit comes with the long and short tubes, and two iclear 30s, the full kit is worth the extra cost for the iclear 30s and spare heads, but the spare tube is superfluous.
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Im stacking with short tube, working perfect, using 2x efest 18350 flat top, the tube screw in to cover the treadings. So no need for long tube here
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