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Post by allan on Nov 14, 2013 1:06:39 GMT
Here's a fresh stator for a DR2 rewound to modern hermetic specs. That really looks good! What is the cost? why did you have this done? What will be the refrigerant? i remember you mentioning shaving a DR piston to de-capacity it but couldn't there be consequences if the cylinder wasn't completely emptying itself on each stroke? i remember the DR piston I just pulled is not flat topped but slightly bowled toward the rod
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Post by jhigdon2 on Nov 14, 2013 7:44:30 GMT
This stator is one that I had rewound a few years back by Eurton electric. It is for modern refrigerants and is wound with amide imide wire. It's a standard rewind for hermetics which they are familiar with. These modern polymers have usually have a temp rating of class F and sometimes H. 155-180deg C. The original cotton was a class A (105)C. I used this in a DR2 briefly in a failed attempt to save a worn out compressor, But I just couldn't get it to pass a bench test.(the comp would only pull about 22 in. vac) The cylinder was to worn. So I just put this back in the box and shelved it. It cost around $350 I think. This will work only with modern refrigerants and not S02. S02 has a chemical incompatability with epoxy's at temps above 120f. One of these day's I would like to try my experiment of detuning a DR compressor for 134 but I have not progressed past the dreaming stage yet. I keep on thinking there has got to be some way to destroke or shave or maybe sleeve the cylinder and fit a smaller piston I'm not quite sure how I'll do it but there has to be some way of dealing with the density difference between S02 and 134 without putting in a restrictor in the suction line.
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Post by frostyfrank on Jan 20, 2014 6:19:04 GMT
I have been watching that great old GE film of an operating DR and decided to see what more I can learn by tearing one down. After watching the film I understand the operation and now know what to look for and where. I pulled the compressor off today and cut open the float assembly. Corrosion was bad and the needle and seat is frozen. Got it soaking in WD 40 hoping I can disassemble and get a close look at needle and seat. Will try to determine the torque on the compressor case bolts and record it for future reassembly of compressors. Will post pics soon Is this film available on-line, if so, can you please share a link ? Thanks ! FrostyFrank
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Post by cablehack on Jan 20, 2014 7:49:31 GMT
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