Newbie to dual coil...

[Kevin MacDonald]

Hey guys, I'm relatively new to wrapping my own coils and up to now have been using a microstick.
I purchased a royal hunter which has a dual coil facility.
Stupid question coming up ...
I notice that when I fire the rda one coil heats fractionally before the other.
Is this normal with a dual coil RDA?
Thanks in advance, Kev.

 

[dbrandt01]

It is not normal. Did you wrap the coils the same? Same tension, wraps, diameter? Are all your screws snug?
Do they at least glow from the inside of the coil first to the outside of the coil?

 

[Rule62]

No. Dual coils, when built and installed properly, should both heat at the same time. If they don't, there could be several reasons:
One coil has more wraps than the other.
The legs on one coil are longer than the other.
One coil has a better connection at the posts than the other.

 

[Thrasher]

Usually on the coil thats slow I loosen the screw on the neg side and make the leg a touch shorter, you drop the resistance in the slower (higher resistance) coil a point or 2 doing this making it more even.

 

[Ryedan]

Hey guys, I'm relatively new to wrapping my own coils and up to now have been using a microstick.
I purchased a royal hunter which has a dual coil facility.
Stupid question coming up ...
I notice that when I fire the RDA one coil heats fractionally before the other.
Is this normal with a dual coil RDA?
Thanks in advance, Kev.

Two coils will never heat up at exactly the same rate because there will always be some physical difference between the two, either in amount of wire in each, the contact quality between the coils if you're doing contact coils, or contact to the atty. I have been using dual coils for a couple of years and do my best to get the pairs as similar as possible. With new coils I get almost no difference in heat up time, but there is some unless I get really lucky. If it's more than about 0.1 second when they're new, have been fired up a few times and both are cold (or at least at about the same temp) I do my best to figure out what the issue is and fix it. If it's about 1/3 of a second or more I fix it or rebuild them right then while I have the wire and tools handy. The problem is not going to get any better over time so it can only get worse.

OTOH, I've vaped coil pairs that were noticeably imperfect and all that happens is one coil gets gunked up a bit faster than the other which means you get less time between needing to clean them both. The more difference there is between them, the less time you get. Ultimately the better matched they are the better your overall vape experience will be, but I don't try to get them matched to milliseconds, it's just not worth it to me.

 

[KentA]

I notice that when I fire the RDA one coil heats fractionally before the other. Is this normal with a dual coil RDA?

It's normal but not perfect.

 

[DingerCPA]

I kinda have to agree with everyone here. If it's "fractional", possibly Thrasher's trick would make a difference. If it's "obvious", then I'd probably scrap and rebuild both coils.

 

[DaveSignal]

If both coils are wrapped around the same ID and have the same wraps, then just make sure that they are the same distance from the posts and all the screws are tightened all the way. And give each coil a couple scratches across all of the wraps with the tip of your tweezers. They will light up at the same time if you do it right.

 

[roxynoodle]

If one of mine lights up before the other, I compress it with tweezers and that always fixes it.

 

[SpaceApe]

I find that if the coils have the same ID, number of wraps, same distance from the posts, etc then usually I would squeeze the coil that is heating up more slowly with my tweezers and strum the coil that is heating up faster with the tip of my tweezers. repeating this process until they heat up evenly from the center outward.

 

[sacullen]

I've always been curious about this whole "strumming" thing. What does it do?

 

[yuseffuhler]

I've always been curious about this whole "strumming" thing. What does it do?

It's make the little vape gremlins work better. It also evens up the oxidized layer. That's the best of my understanding.

 

[Boden]

It's make the little vape gremlins work better. It also evens up the oxidized layer. That's the best of my understanding.

That's about right. Strumming breaks apart shorts between the wraps. Then the next time you heat the wire the oxide formation will fill in the spot where the two wires were touching.

 

[Kevin MacDonald]

Hey Guys, thanks to everyone for taking the time to read and reply, much appreciated