my first dual coil (but fail)

[SonnyCooL]

i just done a dual coil in with my Goon rda, but one side is much stronger than the other side.
may i know what is the issue ?
0.6 Ohm on single coil reading for both coil.

sorry for newbee question ...

 

[stols001]

I'm not quite sure what you are trying to say as far as "one side being "stronger" than the other. What do you mean? If they are the same resistance, I'm not quite sure how one could be "stronger" than the other.

Are you noticing more vape from one coil than the other (although I'm not quite sure how you would?) Also, coil placement and wicking play a role, it's one reason that dual coils can be a bit challenging to begin with. There are so many variables, it could also be your airflow, I guess.

And, I am just guessing since the fact is, unfortunately, that I'm not entirely clear on what you are trying to state to begin with. If they are the same build, material and resistance (0.6 for each coil) one really shouldn't be "stronger" than another. So I'm a bit confused about your question could you clarify?

Anna

 

[bombastinator]

That’s a common problem for me and dual coils and one of the reasons I gave them up. Electricity follows the path of least resistance even though the difference may be very small. The reason dual coils work at all is as the electricity heats the wire the resistance goes up so they eventually even out. The greater the difference in resistance between the two coils (and there will always be one) the longer it takes. Even a very small difference is more than enough to unbalance a coil pair in my experience.

 

[SonnyCooL]

I'm not quite sure what you are trying to say as far as "one side being "stronger" than the other. What do you mean? If they are the same resistance, I'm not quite sure how one could be "stronger" than the other.

Are you noticing more vape from one coil than the other (although I'm not quite sure how you would?) Also, coil placement and wicking play a role, it's one reason that dual coils can be a bit challenging to begin with. There are so many variables, it could also be your airflow, I guess.

And, I am just guessing since the fact is, unfortunately, that I'm not entirely clear on what you are trying to state to begin with. If they are the same build, material and resistance (0.6 for each coil) one really shouldn't be "stronger" than another. So I'm a bit confused about your question could you clarify?

Anna

this is how i tell.

 

[bombastinator]

this is how i tell.
View attachment 739279

Yep. That’s what I’m talking about. Balancing coils is a pain in the ..... Tiny amounts of metal removal to get them the same . I quit bothering.

 

[Flavored]

Connection issue, one coil lead is not making as good contact on one end as the other. In order for that clamp to work with 2 coils, and especially with fat wires, you have to make sure both are squeezed equally by the clamp. Put the wire leads for each end of both coils right next to each other and in the center of the connection clamp. Tighten the 2 screws evenly (ie - keep the clamp faces parallel) until it makes good contact with both end wires. If you have them both properly trapped, a tug on either coil should not move it. Then tighten each screw equally, maybe a quarter to half turn at a time until you know they're both good and tight, and equally tight. If that top clamp is squeezing one wire better than the other, you'll get uneven heating.

 

[bombastinator]

Connection issue, one coil lead is not making as good contact on one end as the other. In order for that clamp to work with 2 coils, and especially with fat wires, you have to make sure both are squeezed equally by the clamp. Put the wire leads for each end of both coils right next to each other and in the center of the connection clamp. Tighten the 2 screws evenly (ie - keep the clamp faces parallel) until it makes good contact with both end wires. If you have them both properly trapped, a tug on either coil should not move it. Then tighten each screw equally, maybe a quarter to half turn at a time until you know they're both good and tight, and equally tight. If that top clamp is squeezing one wire better than the other, you'll get uneven heating.

Hmm. I’ll have to try this. Personally I’m doubtful that uneven wire pressure would cause this but it’s worth a shot.

 

[SonnyCooL]

Connection issue, one coil lead is not making as good contact on one end as the other. In order for that clamp to work with 2 coils, and especially with fat wires, you have to make sure both are squeezed equally by the clamp. Put the wire leads for each end of both coils right next to each other and in the center of the connection clamp. Tighten the 2 screws evenly (ie - keep the clamp faces parallel) until it makes good contact with both end wires. If you have them both properly trapped, a tug on either coil should not move it. Then tighten each screw equally, maybe a quarter to half turn at a time until you know they're both good and tight, and equally tight. If that top clamp is squeezing one wire better than the other, you'll get uneven heating.

thank you ....
one of the wire is on top of other, without magnify i can't see, thanks u save my day ....

 

[Flavored]

Hmm. I’ll have to try this. Personally I’m doubtful that uneven wire pressure would cause this but it’s worth a shot.

It isn't so much the pressure, but even pressure will almost always result in good connections for both coils at both ends. The coils are the same, the lead length pretty much has to be the same given the space inside the atty, the connection point is the only spot a difference in resistance can occur. Get that top half of the connection "cocked" any at all, and a bad connection is very likely.

 

[bombastinator]

It isn't so much the pressure, but even pressure will almost always result in good connections for both coils at both ends. The coils are the same, the lead length pretty much has to be the same given the space inside the atty, the connection point is the only spot a difference in resistance can occur. Get that top half of the connection "cocked" any at all, and a bad connection is very likely.

Not necessarily. There can be variances in the metal, minuscule winding differences, etc.. I still plan to test this though. The mods I’m using atm are all set up single coil so it may be a while.

 

[Flavored]

I agree with that essentially, nothing is perfect, though it is likely the coils are wound from the spool right after each other (but I don't know that). However for the firing difference he's showing in the picture, that is very likely a connection difference. Good luck!

 

[Mr. Relentless]

Trim those leads off. No reason besides it bothers me.