Do you have pics of the work done and the set ups?
Ok here's a couple of shots
I have 3 KF4 clones. 2 of them I am attempting to compare.
In the shot below of the coils the one on the left is:
8 wraps, 3mm ID, 28gauge kanthal, 1.5ohms installed.
The one of the right is:
6 wraps, 3mm ID, 28gauge kanthal, 1.2ohms installed.
...The 6 wraps at 1.2 ohm is what I used with 80%VG. Excellent wicking and excellent vapour. Also used with 55% VG. Excellent wicking and vapour production.
The 8 wrap I had in the unadulterated standard clone. Wicking problems and some dry hits even with 55% VG and airflow screw set to what I thought was a far too tight draw.
I have just swapped the build decks and put the 8 wrap into the bigger bore clone also with the same 55% juice and I am not getting any wicking problems. I don't do any primer puffs but what I do do is loosen the fill head (after a few blasts on it) and observe how many bubbles come up. Lots in the standard clone and usually none in the bigger bore clone.
Here's a shot of the 2 upturned chimneys. You can just make out the one on the right has bigger juice holes:
What went well with the re-bore of the juice holes was the fact that it actually worked without it becoming a total balls-up. What didn't go well was the fact that is was almost a total balls-up. My pal was a bit gung-ho with the pillar drill. There was no clamp or vice available to hold the piece.
First effort was with the chimney in a suitable sized spark plug socket and held by his fingers alone. This didn't go well and it was snatched out of his fingers and went a-spinning on the drill bit.
Second effort onwards had the piece held by mulgrips/locking pliers on top of the socket. This kept the piece under control.
Most drill holes did ever so slightly bulge the corresponding thread on the outside of the chimney. At least one drilled hole was perfect with no bulge to the thread. One drilled hole, and I suspect it was the one that was lost control of, made a microscopic puncture through to the other side where the thread is. When I first saw the result I thought 'oh god, I'm down to 2 clones and a 44 piece spares kit'.
Reassembly was fine though, the slight bulges in the chimney's large outer thread were no problem for the next piece to screw onto.
It leaked however. The puncture blunder had me thinking it was a total balls up again. Happy I was, to discover that I could use one of the spare O-rings it came with to re-seal it.
Here's a shot of the bastardised big bore next to a standard. You can see the extra O ring and the en-biggened outer air intake holes.
I 'splain you all this with the point being that it is possible to drill these holes out with no damage to the chimney.
The main reason I wanted to try this was because I had tried a number of different coils and wicks in those coils and I just wasn't happy with the wicking/juice flow for the various high VG content DIY juices I was using. Even with 55% VG I was getting really pissed off with it not keeping up with my greedy vaping requirements.
So anyway so far I'm impressed with the results. A few tests in the evening is not the same as taking it to work and vaping all day on it so this is still a work in progress for me to decide if it's worth doing to the other 2 clones I have.
I have been careful not to mention flavour.... i THINK it's good but I've been using some high VG juice I have which is not the best test for flavours. I will be using this with different flavours over the coming days and will have more feedback to share lest anyone be interested.
If anyone would like me to test anything in particular let me know.
MM
