d.o.a. evod head

[madstabber]

I got 5 new evod heads today for my protank and was wondering what was going on here. 1 of the heads is reading low load on my zmax, but only when on the tank and wet with juice. It fires fine when it is screwed in with no tank and with tank but when I put juice in the tank it won't fire. It reads low load so I was wondering if anyone knows what's going on here. Does it need to be rebuilt or is there an easier fix.

 

[Unforeseen]

Moved to Assorted PV Topics - Tanks

 

[pdxtechdoctor]

Well it'shorting out somewhere. Something must be moving around between filling and emptying and testing the coil..

I rebuild my heads quite frequently and there are some things you can do..

1. Always, ALWAYS make sure the head is screwed in all the way before screwing the base into the tank. When I first got these I would always have sporadic issues.. They would work great after a rebuild and then after a tank or two, it would be a piece of crap. I've noticed that just unscrewing the base from the tank can loosen the head...

2. Check the area at the bottom of the head where the bottom gasket is and make sure that there is no exposed wire, if it isn't trimmed really close, that could cause a short.

3. Pull the center post and remove the flavor wicks. Take a pin and push the outside coil on each side towards the center of the head. If the coil is too close to the surrounding metal it will short and cause a low ohm reading..

If that doesn't work you can always rebuild it. I find that these are really easy to build after doing it a few times. I know only buy heads for spare parts. I have lost 1 post and I imagine that over time the bottom rubber gromett will split or get burnt since it is touching the resistance wire..

After much experimentation, I now use 3mm wick, 32g Nichrome and then use 3 strands from the 3mm wick for flavor wicks.

 

[Indagroove]

Hey PDX, what guage wire do you recommend to get around 2.4 ohms? I am going to get into the rebuild area and I mostly see people rebuilding at low ohms, I like the HR better.

 

[pdxtechdoctor]

Hey PDX, what guage wire do you recommend to get around 2.4 ohms? I am going to get into the rebuild area and I mostly see people rebuilding at low ohms, I like the HR better.

Probably what most people are using... the 32g Kanthal... Or maybe 33 or 34 I haven't used either though.. It's what I used when I started, but I wanted to go a little lower.

You probably want to use 3mm wick with the 32g kanthal and go 5/6 wraps or 6/7 wraps.. It will take some practice to get 6/7 wraps on an evod head because it is so small inside.. Don't be afraid to move the coils with a pin once it is inside to move it away from the wall of the head. Also, I push the coil together right after it is wrapped a couple of time to scrunch it up to make it not as wide...

I also started wrapping coils on a RBA and that gave me the practice I needed to start working on the smaller evod coils.. I bought a cheap phoenix clone to start with..