Aqua Lung titan lx supreme or ScubaPro MK 17 C300

[EbbTideMike]

Too many options! :thinking:

 

[inka]

Too many options! :thinking:

I have one Titan LX Suprem and one APEKS DS4 / XTX40, both great regulators, basic, and low costs maintenance. Get the Titan, you won´t be disapointed

 

[halocline]

BTW don’t expect too much support from Halocline, he still ‘owes ‘me an answer to my last post in the thread http://www.scubaboard.com/forums/regulators/432068-little-advice-2nd-stages-please.html and usually does not answer if he feels I might be right in my argumentation.

So you're a mind reader as well as a regulator expert?

The reason I didn't reply to that thread is because I had nothing new to offer; I explained it the first time and if you didn't get it or agree then, what would be different the 2nd time? But, since you insisted, I did just post on it, although I was basically just re-iterating that 2nd stages are constant volume devices and their function does not change at depth, at least until you get to extreme depth far beyond sport diving. And that part I'm only guessing about.

---------- Post added May 16th, 2013 at 10:29 AM ----------

So if you still think an obscure venturi is causing the higher dynamic IP and not spring fatigue or the design, then I’m probably not able to deliver the hard data you could accept.

I think the reason you can't get any 'hard data' supporting the spring fatigue idea as an explanation for apparent larger IP drop in MK10s as opposed to MK5s is because spring fatigue is not the answer. Or if it is, every single MK10 I've ever seen has a worn-out spring and none of the MK5s have one.

I suspect that it's some sort of measurement issue that is complicated by airflow characteristics in the MK10 vs MK5. There's no other explanation that makes any sense. I did talk with Peter Wolfinger about this a few years back, and he agreed. He really had no idea what else could cause it.

Flow rates in 1st stages are measured with all the LP ports open and a high volume supply source. So how that translates to measuring IP drop in a single port while air is moving, from a supply source as restricted as a tank valve, is beyond me. And I don't think that bench tools used in scuba shops are necessarily any more accurate, but I really don't know about that.

I do know that spring fatigue in the MK10 and MK5 has nothing to do with it.

 

[axxel57]

Okay,Halo, if you think it has nothing to do with a change in spring tension over the time, maybe it makes you happier considering it a bad design from SP in comparison to others of their models..........

 

[halocline]

Okay,Halo, if you think it has nothing to do with a change in spring tension over the time, maybe it makes you happier considering it a bad design from SP in comparison to others of their models..........

I really think it's a measurement issue, I just don't understand what else it could be. But I'm guessing.

I believe that the rounded piston was introduced in part to stem IP drop and allow better airflow over the piston edge. I'd really like to compare IP drop on a MK10+ as opposed to a MK10, just to see what happens. I don't have any MK10+ conversion kits, but I'd like to find one.

I have seen MK20s with the brass tipped piston drop substantially (measured with an IP gauge on the LP inflator hose), then drop noticeably less once I put in the composite piston...that one has my head scratching. Same regulator, same spring, etc....

 

[axxel57]

I really think it's a measurement issue, I just don't understand what else it could be. But I'm guessing.

I believe that the rounded piston was introduced in part to stem IP drop and allow better airflow over the piston edge. I'd really like to compare IP drop on a MK10+ as opposed to a MK10, just to see what happens. I don't have any MK10+ conversion kits, but I'd like to find one.

I have seen MK20s with the brass tipped piston drop substantially (measured with an IP gauge on the LP inflator hose), then drop noticeably less once I put in the composite piston...that one has my head scratching. Same regulator, same spring, etc....

Okay, since you are insisting in this measurement thing, I'm getting courious.

When I find time I will test different configurations, I think I got all different types of pistons for the MK10 - MK20. I got old and new springs for the MK20, just missing a brand new spring for the MK10 and a MK10+ conversion kit, I'll get it.

I'll come back to you about this.

 

[halocline]

Last I heard SP had no more MK10+ conversion kits in stock, but if you can find one....

 

[axxel57]

I'll check it out.

If I don't get it in the US, I'll get it in Europe, it's even cheaper there.........