RDA Is it the coils or the RDA?

[Ollie]

Hi Guys..

Sry if there's already a thread on here about it but I tried searching for even coils and couldn't find an answer..

I've just made some coils, inserted them the best I could and started to heat them up..one coil was heating up nice and even and the 2nd coil was lacking behind..it did heat up eventually but not at the same rate as the 1st one..

So I took out the slower coil and put it in the posts where the good coil was heating up nicely..and it worked like a charm..so then I put the initially good coil in the other post and then it happened to that coil too (slower heating).

Is it the posts? the rda is authentic..but maybe I'm doing something wrong..it seems to happen when I put the 2nd coil in.

Cheers all

 

[State O' Flux]

Hi Guys..

Sry if there's already a thread on here about it but I tried searching for even coils and couldn't find an answer..

I've just made some coils, inserted them the best I could and started to heat them up..one coil was heating up nice and even and the 2nd coil was lacking behind..it did heat up eventually but not at the same rate as the 1st one..

So I took out the slower coil and put it in the posts where the good coil was heating up nicely..and it worked like a charm..so then I put the initially good coil in the other post and then it happened to that coil too (slower heating).

Is it the posts? the rda is authentic..but maybe I'm doing something wrong..it seems to happen when I put the 2nd coil in.

Cheers all

Are your coils identical, to the best of your ability, both for wrap count, tension applied ("wrap tension" - if it varies from one coil to the next can cause a difference in resistance, as the wire is "stretched" at differing rates) and tail lengths to terminals? Each coil should be made, and fit, as identically as possible.

In theory, both terminals (2 sets - 4 holes?) should have very close to identical resistance values... or rather a lack of resistance... in the low milliohm range. If you test them with a normal DMM, they'd both probably read zero, or what ever the test lead included low resistance is... just one or two tenths of an ohm.
If you were to test them with a milliohm meter, they might be several hundred thousandths of an ohm appart... which should have only a minimal time effect on the visible heating lag time, between one coil and the other.

In closing, unless a maker (authentic or not) actually tests each RDA for matched resistance, post sets that don't match closely are going to be fairly common... but not so uncommon that there's a (visible) lag time, assuming that coils are identical, down to the hundredths of a milliohm value.

 

[Niten13]

Post a pic of your coils and it would def help!

 

[RipTodd]

Based on your troubleshooting sequence I would think its one of the negative posts.

 

[MattyTny]

Based on your troubleshooting sequence I would think its one of the negative posts.

Yeah. Check the negative post screws to ensure they are making good contact. Sometimes they can have sharp edges that can be sanded or filed out. Also see if the the negative leads are tight in the post when screwed down. See if the coil moves when you wiggle the excess lead.

This doesn't really pertain to your issue, but I notice that sometimes the more evenly heating coil can be the slightly slower one, and working on the faster one brings it to the same pace and with nice even heating action.