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Post by SeaRat on May 22, 2018 8:16:17 GMT -8
I have enlarged this Hydro Twin parts diagram in a request from Phil.  This should make it easier to see. John |
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Post by snark3 on May 22, 2018 10:01:13 GMT -8
John,
I'm not looking to start an argument here but I believe the diagram you posted is for a Hydro Twin II, not a Hydro Twin. There are 2 things in the diagram that make me feel this way. The spring housing (#12 in the diagram) appears to be a six sided nut which is used on the Hydro-Twin II, my reg which I believe is a Hydro-Twin it only has 2 flat sides and has much more material above the threads. The spring housing on mine has 3/4" above the threads. The second thing that makes me think this is a II is the high pressure seat appears to have a small rod made into it. This is the seat for the balanced Sportsways (II), mine which I believe is the unbalanced Hydro-Twin has the small plastic one (like Healthways) that the spring fits inside. The Scuba Museum has pictures of both the Hydro-Twin and the Hydro-Twin II if anyone want to compare the spring housing of the 2 regs.
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Post by nikeajax on May 22, 2018 10:15:37 GMT -8
They're virtually the same regulator though!   The HT-II has a few mods that make it better, but working on the HT is just that much simpler because you don't need to stuff a tiny o-ring into it... JB |
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Post by SeaRat on May 22, 2018 10:55:03 GMT -8
Snark3,
Your right, but I have a Hydro Twin that is balanced. It has a blue label (photo to come), and says "Hydro-Twin," but it is in reality a Hydro-Twin II. So this goes all the way back to the manufacturer, Sportsways and their confusion about their own product.
John
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Post by vance on May 22, 2018 10:58:15 GMT -8
John, I'm not looking to start an argument here but I believe the diagram you posted is for a Hydro Twin II, not a Hydro Twin. There are 2 things in the diagram that make me feel this way. The spring housing (#12 in the diagram) appears to be a six sided nut which is used on the Hydro-Twin II, my reg which I believe is a Hydro-Twin it only has 2 flat sides and has much more material above the threads. The spring housing on mine has 3/4" above the threads. The second thing that makes me think this is a II is the high pressure seat appears to have a small rod made into it. This is the seat for the balanced Sportsways (II), mine which I believe is the unbalanced Hydro-Twin has the small plastic one (like Healthways) that the spring fits inside. The Scuba Museum has pictures of both the Hydro-Twin and the Hydro-Twin II if anyone want to compare the spring housing of the 2 regs. John's diagram is the HTII. It shows the balanced plunger with the shaft and the o-ring retainer/guide. The diagram I posted shows both balanced and unbalanced firsts with the tilt valve second, and John's shows the downstream second, so we have diagrams covering these regs now. Are there tilt valve and downstream versions of the HydroTwin? Or is the Dual Air the only DH version with a tilt valve? |
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Post by vance on May 22, 2018 11:01:48 GMT -8
Vance, I have previously posted this image/parts diagram of the Hydro Twin regulator, but I think it was lost to the PhotoBucket debacle. John It is maddening to try to find reference photos on-line now because so many are now photobucket hostages! |
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Post by vance on May 22, 2018 11:14:21 GMT -8
Snark3, Your right, but I have a Hydro Twin that is balanced. It has a blue label (photo to come), and says "Hydro-Twin," but it is in reality a Hydro-Twin II. So this goes all the way back to the manufacturer, Sportsways and their confusion about their own product. John Did you get that reg new? |
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Post by vance on May 22, 2018 11:28:34 GMT -8
The spring housing (#12 in the diagram) appears to be a six sided nut which is used on the Hydro-Twin II, my reg which I believe is a Hydro-Twin it only has 2 flat sides and has much more material above the threads. The spring housing on mine has 3/4" above the threads. Like this Navy Unit? My newer Waterlung 3000 also has this style spring housing.  |
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Post by snark3 on May 22, 2018 11:33:49 GMT -8
Phil,
That is what the spring housing on mine looks like.
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Post by snark3 on May 22, 2018 11:46:15 GMT -8
JB,
You're right about this being a very easy reg to work on. I can't wait to dive this with one of the tanks I bought from New England Divers (they still have the NED and free air for life stickers on them) and maybe even my NED horse collar.
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Post by vance on May 22, 2018 12:24:15 GMT -8
Phil, That is what the spring housing on mine looks like. I tried switching the spring housing and balanced HP guts out of the Waterlung 3000 first into the HTII first body because it has a better designed valve seat support/o-ring system, but it didn't fit. I wonder if you can change the unbalanced versions with this similar housing to balanced with the 3000 parts? All you'd need is the support and the seat, maybe. |
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Post by SeaRat on May 22, 2018 22:43:50 GMT -8
Let's talk a bit about the second stage. I will follow up with some photos, but I did a bit of experimentation this afternoon on my second stage. I wanted to know if I could lessen the spring tension by loosinging the housing; nope, I cannot. It must seal against the bottom of the LP area, as that's where there is a rubber gasket. Then I wanted to know whether I should turn the oriface around, as I have the large hole pointed down the intake hose. So I turned it around, and the breathing was noticably worse with the small hole pointed down the intake. (I had done that once before, but it was probably two decades ago.) So my recommendation is to look and make sure the large hole is pointed down the inhalation horn/hose toward the mouthpiece.
Before that, I tried to decrease the IP on the first stage as it was set at about 180 psig. That is too high for an octopus (Sport Diver second stage) to be used. So I knocked it down to about 140 psig, but it did not breath well. So it's back up, but at just under 160 psig. That still may be too high for an octopus, unless it's a Scubapro 109.
By the way, the original Sportsways mouthpiece is not a good breather. If you still have it, change it out for a Voit/USD mouthpiece and notice a dramatic difference in ease of breathing.
John
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Post by vance on May 23, 2018 9:22:04 GMT -8
I did a bit of experimentation this afternoon on my second stage. I wanted to know if I could lessen the spring tension by loosinging the housing; nope, I cannot. It must seal against the bottom of the LP area, as that's where there is a rubber gasket. John John, I had a Snark III that I could not get to stop blowing the OPRV. I backed out the first stage spring retainer as much as I dared, but could not get the IP down. It was assembled exactly the same as another I have that was fine. I ended up putting another, or maybe two more gaskets under the first stage spring housing to loosen the spring tension. This might work on your second stage? |
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Post by vance on May 23, 2018 9:26:06 GMT -8
My Sport Diver II second burps a couple of times when I turn on the air to the HTII. The IP is higher than I'd like for the same reasons as John's, but it works fine in the water.
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Post by nikeajax on May 23, 2018 9:37:36 GMT -8
Phil, check the condition of the plunger: I think you're experiencing IP-creep. My Calypso-IV and Conshelf-XIV and Olympic-400 were all doing that too. That splutter-burp sound exactly like my my regs were doing... JB EDIT: Here's a jig and tool you can make to resurface the plunger cones (please note the diameter is wrong on the jig)you place the assembly into a drill chuck and spin up then touch the cone:  |
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The HT-II has a few mods that make it better, but working on the HT is just that much simpler because you don't need to stuff a tiny o-ring into it...
