Nice to see that the discussion about alternate methods of using the Evo has come up again. Most here seem to prefer to use the Evo as designed, but I'm one of the ones that prefers not to use the standard Delrin Insulating Sleeve. I never managed to get what I consider reasonable hits with the standard setup. I tried everything that was suggested, did tests to figure out where the air path might have a leak, but nothing helped. I was beginning to think I had a weak Evo core. Then one day I just put a mouthpiece directly into the top of the Evo core, not using the insulating sleeve at all, and the Evo went from being a huge disappointment to a great pleasure. Clean hits just like my T1, with no stirring required, and no endless cleaning of the holes in the T1 cap. I enjoyed it so much that I stopped using my T1 for a few weeks. (I go back and forth these days, alternating between my T1 and Evo and DART, depending on my mood and circumstance).
I did a bunch of experimenting with the Evo setup and settled on what works the best for me. It required modifying the standard Delrin Insulating Sleeve and switching to a UFO based extended Delrin mouthpiece. Here's the story.
I started out with the bare SV Evo core screwed into a T1 battery base with an Insulated adapter, the adapter that allows you to screw in the Evo core into the T1 base, not to be confused with the Delrin Insulating
Sleeve, which is mentioned from here on.
I was using my white PTFE mouthpiece to start, as I wasn't sure if the Delrin mouthpiece could take the heat involved with direct connection to the core. I was getting great hits, and loving my Evo, but I was getting bits of botanicals in my mouth with every hit, as there was no screen of any kind in the vapor path. As I got more and more medicated, I also started putting up with burning my fingers on the very hot Evo core now and then. The first time I burned my lips on the top of the metal core by taking too much of the very small PTFE mouthpiece into my mouth, I realized that I had to figure out a better way.
So I switched to the extended Delrin mouthpiece to keep my lips away from the core, and checked repeatedly to make sure the Delrin wasn't melting or deforming, and that the O-Ring was holding up. It's been fine for months of heavy use. Then I ordered a UFO equipped extended Delrin mouthpiece from TV, and that took care of the little bits of herb that were in every hit. The UFO doesn't significantly effect the draw, with the heaviest restriction on air flow still being the intake holes in the bottom of the Evo core above the 501 threads.
Finally, I was still burning my fingers on the core now and then, so it came time to hack the standard Delrin Insulating Sleeve. When I ordered the extended Delrin mouthpiece with UFO, I also ordered a couple of extra insulating sleeves. I asked TV to not press the UFO into the top of the sleeves, as I was planning on cutting the top off, and that's where the UFO lives. They were happy to oblige, and they even included the UFOs loose with the sleeves, which was really great as it allowed me to add the UFOs to some of the other extra mouthpieces I already had.
ThermoEssence is really the best. They go out of their way to be really useful to their customers, and they're a pleasure to deal with. They honor bizarre requests, and are happy to help you if there's something you want that isn't on their web site. You want five orange O-Rings instead of an assortment?, just ask. If you've you made medicating a way of life ("It's not just a hobby"), there is no better company to deal with.
So I took a knife and
carefully cut the top part off a standard Delrin Insulating Sleeve. Then I took a small Dremel grinder and smoothed out the rough edges on the top, and voila.
Here's what you can see in the picture above. On the left is the standard Evo setup with the supplied short Delrin mouthpiece. The sleeve goes over the core, and the mouthpiece goes into the sleeve. The sleeve has a UFO built into the top, so no particulate matter goes into your mouth. Next is the setup with the same mouthpiece, inserted directly into the Evo core, with the modified Delrin Insulating Sleeve on the outside of the core. The mouthpiece doesn't even touch the modified sleeve. To the right of them is a view from the top looking down, so you can see how the sleeve fits around the core, and how the mouthpiece sits in the top of the core. This is with the white PTFE mouthpiece, which is the same size as the short black Delrin mouthpiece in the other pictures to the left. I used the white one for this picture because it shows more clearly what is going on. The silver ring you can just see around the white mouthpiece is the top of the Evo core, and the black around that is the top of the modified insulator sleeve where I chopped off the top.
Some interesting tidbits about all this.
If you look closely at the picture above, you can see the red O-Ring around the Evo core that's used to help hold the insulating sleeve in place, and to prevent air from getting in at the bottom of the sleeve, which would dilute the vapor coming from the core. The usual place for this O-Ring is one notch lower, but I put it there in the pictures because it shows where the bottom of the Evo herb chamber lies. This is the bottom of the "bowl" that holds your botanicals. When you use the Evo as designed, with the unmodified insulating sleeve, the whole top of the core is available to hold your weed. When you put a mouthpiece directly into the core (bypassing the insulating sleeve), you lose some of the available space at the top of the core. When you use a mouthpiece with a UFO pressed into the bottom, you lose even more space. A close look at the picture shows you exactly how much you lose. With a UFO equipped mouthpiece, your load size is about half what it would be with the standard Evo setup. For me, it's more than worth it, but it is something to be aware of.
Also something to be aware of is that a UFO equipped mouthpiece will only fit into the Evo core or the Rev/DART core. It won't fit into a T1 or the standard Evo insulating sleeve. It also won't fit into a Smooth-Flow or Pure-Flow.
The different mouthpieces and non-glass bong adapters have subtly different ends. On the end that fits into the core/cap there is a tiny extended lip around the standard length Delrin and PTFE mouthpieces that isn't around the extended length Delrin mouthpieces or the bong adapters. The lip makes the fit MUCH better, with no side to side wiggle possible. At least I think it's the lip. My extended Delrin mouthpiece doesn't have this lip, and it wiggles around. The Delrin/PTFE bong adapters don't even have a diameter increase, and can be inserted deep with nothing to stop them at all.
HEY TIM: Next time you remake the molds, please include the lip around the circumference of all the mouthpieces; it makes the mouthpiece fit much better into whatever it's inserted. (Or if it's not the lip, something allows the extended Delrin mouthpiece to wiggle around when inserted in the core, while the shorties are a perfect wiggle-free fit).