View Full Version : Another Mach2GT mod
weescott
11-15-2007, 03:16 PM
I bought a Mach2GT from a member here for mucho cheapness, it needed a little work done to it but I was getting it modded by a builder here anyway so didn't matter.
I'm not a phase expert but I thought some of the specs might be of interest to some of you:
Duniek head, modded with extra surface area at the base and ports up top.
Captube at 2.75m and soft soldered at accumulator. (high load slhx mod)
Blended gas
New probe and resistor calibration
New insulation, braid, etc.
Compressor Aspera T2140 1/2hp
DSH coil, new thin rear fan for clearance, set to 'turbo' fan speeds
Pulls down to -58c
At 200 watts it's sitting at -43c evap and reading -28 on the load tester probe
260w it's holding about -38c evap and -21c tester probe
Just waiting for my QX9650 to arrive now :D
http://www.weescott.co.uk/images/new_phase.jpg
http://www.weescott.co.uk/images/new_phase2.jpg
:)
soft soldered at the accumulator? I'm not an expert either, but you really should consider brazing all the joints/etc (hard soldering) as soft soldering leads to leaks a lot of the time
and what gas blend and cap tube size (diameter) are you using are you using?
aside from those details, good job
killermiller
11-15-2007, 03:29 PM
Ali,
The cap is soldered to the accumulator for subcooling. The DSH coil is on the dischage and doesn't have much to do with floodback. If anything, shortening the cap would lead to more floodback, but we can't tell for sure since he didnt' reveal any pressures and superheat.
softsolder captube to accumulator is no problem as killermiller says.
very nice results, what gases is blended?
regards
Tim
hey i like the temps its running :D
Could i ask how much mods like that cost?
weescott
11-15-2007, 04:53 PM
I know how some builders like to keep thier blends close to thier chest but meh, no percentages so I cant do any harm:
402a/507/134/290
The cost of the mod was very reasonable. I don't want to pimp the builder but PM me if you wish. :)
Ali,
The cap is soldered to the accumulator for subcooling. The DSH coil is on the dischage and doesn't have much to do with floodback. If anything, shortening the cap would lead to more floodback, but we can't tell for sure since he didnt' reveal any pressures and superheat.
ok, you're the expert, not me, I'm just trying to learn
killermiller
11-15-2007, 07:14 PM
I am one of the newer people around here as well.
[XC] gomeler
11-15-2007, 08:00 PM
Soldering the cap-tube is a common practice, I only do it when I'm absolutely positive I won't be adjusting the captube again. Made the mistake on a mod once and soldered it up and then ended up having to trim about 20cm off.. had to desolder a lot of captube. Impressive fitting that compressor in there, wonder what the discharge pressures and compressor shell temps are like though :eek:
What Scott ment was, cap tube was wraped around the accumulator, it's then sliver soldered onto the accumulator. This giving it a better join and a better thermal contact so it boils off more gas.
Been chatting to the builder of it last night Scott, amazing stuff and the evap mod im gonna give a try.
Some decent photos wouldn't of gone a miss
PhilippF
11-16-2007, 05:20 AM
Very nice one. I think this will be as large as a compressor can get inside this case :)
Soft soldering the captube is ok, as it is only for the heat transfer and doesnt connect any HP-parts. It really helps to get the extra few Quad-watts out of the unit.
What Scott ment was, cap tube was wraped around the accumulator, it's then sliver soldered onto the accumulator. This giving it a better join and a better thermal contact so it boils off more gas.
Been chatting to the builder of it last night Scott, amazing stuff and the evap mod im gonna give a try.
Some decent photos wouldn't of gone a miss
ahh thanks pete, I thought he meant soldering the joint of the captube to the filter, and that's why I thought brazing would be smarter