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Date: Fri, 21 Jul 1995 14:46:43 +22305714 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
Subject: Re: Reg breaths too easy
To: Roger Carlson <rgc@co*.sp*.tr*.co*>
Cc: techdiver@terra.net

> OK, here's one for you. I switched my primary from a Dacor Extreme to a
Scubapro 
> G250. I like the Extreme a lot, except it breathes a little dry, as non-metal 
> regs often do, and it works less well after I put my 120 down on it. There's 
> just one thing about this Scubapro: it breathes too easy for me. Now, it is 
> adjustable, so I just crank it down and fix the problem, but I have to crank
it 
> wayyyy down, *well* past the point where any trickle of air stops. There's a 
> wide band of adjustment where it just takes a little, too little for me, 
> inhalation pressure (or a bit of water current) to get things flowing, and
when 
> the venturi is on, it keeps flowing. I feel like I put my mouth right on my
tank 
> valve. I've found I *like* a little bit of breathing resistance. With this
reg, 
> my air consumption is way up and my breathing pottern is messed up. I'm going 
> back to the Extreme, but here's my question: can I / should I get used to low 
> resistance regs? I've heard that a reg with high breathing effort is wasting 
> energy and therefore air. Is it a significant amount? If I can find a
breathing 
> pattern that is used to less resistance, will I be using less air?

Roger, the SP G250 is, in my opinion, the best regulator I've ever used.
It sounds like you should adjust the angle of the venturi vain (or
whatever the hell Scubapro calls it).  That's the little lever-knob up near
the mouthpiece; angled down yields reduced venturi effect.  Cranking down
the big knob only affects cracking pressure/resistance.

I suspect you may have already tried this....

Aloha,
Rich

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