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Post by nikeajax on Jul 7, 2017 16:33:42 GMT -8
I am gob-struck by the difference it makes. This coming from a Gob himself!  I mean no offense by this BTW! Way back when, a sailor in the U.S. Navy was often called a Gob. Here's a swell Porky Pig cartoon from 1938 called, "Porky the Gob", enjoy! www.dailymotion.com/video/x11dy93_porky-the-gob-1938_shortfilmsI knowed you was in the Navy! JB |
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Post by SeaRat on Jul 7, 2017 17:54:56 GMT -8
I'm gunna tear into that Mares MR12 III soon. I like the venturi aspect. I'm not sure I want to have bubbles going up my ears anymore, though! Single hoses are kew, available, and you can get them cheap, but not my thing. I totally get the collector's standpoint. Even so, I seem to be filling up my single hose box! Now it's got a Scubair, a Calypso, a ScubaStarTDQK, the Mares MR12, and a strange and wonderful Seamless reg. If you'll look at the U.S. Navy study I posted above, there were two recommendations that they made to AMF Voit to improve the MR-12 II. These were: 1. Increase the size of the exhaust to 1 inch. 2. Make a better diaphragm. (From memory) I'm curious as to whether the MR-12 III did any of these changes, other than the cosmetic change in the cover? Could you do a little sleuthing for us on this, and maybe measure the exhaust port, and look at the type of diaphragm to see whether it's an improvement? John |
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Post by vance on Jul 7, 2017 21:29:48 GMT -8
Will do. I'm about to tear into it sooner or later. I doubt anyone is confused, but my list of what's in the singlehose box is down today by 2: the AMF MR12 and a Calypso 3, sent off to Canada. I hope they like ice diving!
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Post by SeaRat on Jul 7, 2017 22:12:10 GMT -8
I just took the cover off my MR-12 II, and measured the exhaust spending--it's 7/8 inch in diameter, with a silicone exhaust mushroom valve (exactly th same size as the MR-12). The main LP diaphragm is also very responsive, and is not the rubberized fabric that was originally on the MR-12. (I have both an update LP diaphragm and silicone mushroom valve in my MR-12 regulator(.
John
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Post by vance on Jul 8, 2017 11:46:41 GMT -8
I took the cover off the MR12 III, and found it is not an easy task. The plastic cover and the one piece clamp ring do not want to work together, the clamp ring should have been a 2 piece part. It's even worse getting it back on. The diaphragm lip tends to slip out of the slight flange on both the box and the cover. But simply trying to get the ring over the cover and onto the box w/o it all shooting across the room takes finesse. So you aren't going to take the cover off to clean sand out while standing in the breakers! I'm not planning on trying that anyway. The first stage is clean. The little bit of corrosion cleaned right up. The mushroom is pliable and not sticky, and the diaphragm very supple. It is not a rubber coated fabric. Both look new. I yanked and twisted on the exhaust horn to get it off, but quit due to faintheartedness. I don't want to tear/break it. The mushroom mount looks to be about an inch in diameter, and the diaphragm is 2.75".   
The reg works great. It's going on the block! Phil |
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Post by vance on Jul 8, 2017 11:50:18 GMT -8
I am gob-struck by the difference it makes. This coming from a Gob himself! I mean no offense by this BTW! Way back when, a sailor in the U.S. Navy was often called a Gob. JB Of course, I meant it in the usual sense. Yer gob is your mouth, as in the everlasting gobstopper (jawbreaker candy in Willy Wonka). |
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Post by nikeajax on Jul 8, 2017 12:11:07 GMT -8
Phil, I knew exactly what ya meant: I was just trying to make conversation is all: an' iff'n I can throw in a bit of esoteric knowledge, I will...  I have zero desire to see the remake of Willy Wonka, Gene Wilder was already perfect in he part I thought Johnny Depp looked too much like Michael Jackson, and was trying too hard to be weird, or as my wife would call it, "Weird Bait!" JB |
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Post by vance on Jul 8, 2017 12:37:27 GMT -8
I figured out how to get the ring and cover on without too many bad words and loss of self-esteem. You put it on over the flange of the case and then tease the cover on over the diaphragm. Lots less stress on the ring (and you) that way.
It's an odd feeling having air blown into your mouth the way this does. Meh.
I'm with JB on not needing any more Willy Wonka remakes.
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Post by nikeajax on Jul 8, 2017 12:48:26 GMT -8
Yeah, I forgot about what a pain those bands can be to get back on: I have mixed feeling about the Allen-bolt too... Oh well, that's wha'cha get, eh?
JB
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Post by vance on Jul 8, 2017 16:49:05 GMT -8
Yeah, I forgot about what a pain those bands can be to get back on: I have mixed feeling about the Allen-bolt too... Oh well, that's wha'cha get, eh? JB My new found method for putting the ring on was a pizza cake. It slipped on like nobody's bidniss. You just have to have faith that the diaphragm seats correctly. I figure, if it breathes good, you did good. Personally, I like an allen head. They CAN strip, and then you're...... toast.... (for the sake of propriety). A star drive is the ultimate for no-stripperization. Slots are aight, but have their slippery points. The Phillips is a mixed bag. Granted, the ability to drive one at an angle is genius, but they can be trying. My MR12 has little red globs of something on all the entry points of the regulator. Somebody wants to know if the reg has been molested! You can see one on the pic of the ring allen screw. |
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Post by vance on Jul 8, 2017 16:52:47 GMT -8
Interesting! Thanks, John! I learned about some stuff with this article. It's great that this board has such a resource as you are, and we can go to school on you! Phil |
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Post by SeaRat on Jul 11, 2017 17:28:51 GMT -8
Phil,
From the photo it seems that the exhaust is the same size as the MR-12 II. Have you made any measurements?
On all the MR-12s, I hold the top cover down on the diaphragm/regulator base hard when I put the ring on. Apparently you've learned to start it on one side, then swing it around so that it goes in all around the edges. It doesn't take much after you learn the technique.
John
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Post by vance on Jul 11, 2017 17:50:48 GMT -8
I think the mushroom is about an inch. I was reluctant to pull the exhaust tee off because it didn't want to budge. I measured the back side taking the overlap into consideration. I'll go with a 1" diameter mushroom.
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Post by crabbyjim on Jul 17, 2017 11:32:36 GMT -8
Hello all!
After reading this thread I went to the garage and pulled out an MR-12, Titan II that looks like JB's second picture, and is serial number 00766. My question is: when were these manufactured? Are they better in some way than other single hose regulators of the same era? During the 70's and 80's I dove with my USD Calypso and it worked well.
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Post by nikeajax on Jul 17, 2017 12:26:37 GMT -8
Hi Jim! Hmmm? If I I dismember rightly, either '67 or '68: it predated the Olympic from '69, and the Olympic with it's HP-module was Dacor's taking an idea and turning it up to 11  I blelive they had a larger exhaust mushroom than most at the time  eg, more gooder breathings JB |
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I mean no offense by this BTW! Way back when, a sailor in the U.S. Navy was often called a Gob. Here's a swell Porky Pig cartoon from 1938 called, "Porky the Gob", enjoy!
eg, more gooder breathings 