John,
Although this does not help trouble shoot your inquiry, this is what I've used for years with excellent results.
Workhorse WP-20 liquid cooled torch body. The only issue I've ever had in almost 17 years has been a failure of the encased power cable due to excessive/repetitive bending near the torch body causing a short. Took me a couple of days to trouble shoot, only 50 bucks to replace.
Don and I have a liking for similar equipment for Ti...the Weldcraft II. I don't know what issues Sean had with it, but I've found it to be an excellent tool for coverage on round intersections at a company suggested flow of 40cfh with my gloved hand wrapped around the cup as it travels, with near 90 degree attitude to the tube. It allows good flow over coverage without turbulent involvement. On flat surfaces, the flow rate is cut back almost by half for a nice even surface coverage.
For steel bicycle tubing, I use an alumina cup with diffuser lens, can't remember the size opening (7 I think?) as I buy them buy the 20 count box and it's been awhile since purchasing. I run the flow at 12-15cfh and it gives mighty fine even coverage on all surface configurations. Nozzle is a nice size without getting too bulky for tight crotch areas.
cheers,
rody
I tried to order the pictures but have failed miserably, so you get what you get
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