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Thread: 1/2+ hp Single Stage Build

  1. #26
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    I have to say that I am impressed from its overall performance, its way better than the first SS that I built.

    Core 2 Duo E4500 stock @ bios



    E4500 2.2 @ 4.4GHz (1.9v, -42.5C)


  2. #27
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    Yeah that is working great, very nice! Oh and you're right, it should do even better when your ambient temps are cooler.
    Last edited by aenigma; 08-06-2019 at 05:36 PM.

  3. #28
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    You have a lot of CPU's to test, might as well send me some hardware to test on my autocascade!

  4. #29
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    Quote Originally Posted by aenigma View Post
    You have a lot of CPU's to test, might as well send me some hardware to test on my autocascade!
    No problem, I have about 30 (different) s775 CPUs to send you if you pay shipping! I am from Greece!

    Last edited by Obijuan83; 08-08-2019 at 06:29 AM.

  5. #30
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    Oh wow nice, you have quite a collection! I was just joking about sending me hardware though haha

  6. #31
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    New mounting kit




  7. #32
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    Nice, it looks good!

  8. #33
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    Ambient temp 26C

    No load Evaporator temp -52.7C

    Last edited by Obijuan83; 08-16-2019 at 12:38 PM.

  9. #34
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    Nice, looks like it's working very well.

  10. #35
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    The ambient temp falls so I have this...



    The problem is that despite the fact that the no load temp is 54.4 it cannot maintain the load that could hold when ambient temp was higher.

    And to give some numbers:

    With ambient temp 29-30 C I had high pressure before condenser about 40C.

    With ambient temp 24-25 C I have high pressure about 36C

    What this means? Long cap tube or not enough refridgerant?

  11. #36
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    First I would try adding some more refrigerant since that is easy to do, but my bet is on the cap tube being a bit too restrictive since the high side pressure is lower now that it is cooler and there isn't as much mass flow anymore.

  12. #37
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    I tried to cover 2/3 of the front condenser surface so the airflow can pass only from the remaining 1/3 and the high side pressure rise from 200psi/35C to 230psi/41C and the difference was huge.It can hold the load even better than before!

    Is that gives you a clue about what is the "problem"

    I tend to believe that its a little undercharged.

  13. #38
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    Yeah it very well could be undercharged that's why I said start by adding some refrigerant and see if that helps since it's easy to do. Do that with full airflow though. If it doesn't help then you just need to shorten your cap tube a little bit. The higher pressure on high side from blocking the airflow will push more refrigerant through the capillary so it is very likely your cap tube is just a little bit too restrictive.

  14. #39
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    Will try add some r404a...!

    No load temp


  15. #40
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    You need to add it under a load slowly to see if it helps. Add a little under a load then let it run that way for a few minutes and see if temps fall. If not then the cap tube is too restrictive.

    <edit>
    I just wanted to add something interesting/funny that just happened. I was wanting to do some low stage work on my autocascade/MRC and I was pumping it down by closing off all the stages and it looked fine but I got sidetracked and when I came back the high side needle was absolutely pegged. It goes to 500psi but it was past that touching the stopper. Compressors still sounded fine luckily, but what a good test of high side lines.

    I usually pump it down into a cylinder while doing this, but it didn't look like it was needed at that time but then I got pulled away doing something else. Very interesting to see that happen with the alleged "bomb" I made in any case.

    What I mean by "bomb" is there were some old old threads on here back when I made this autocascade that had people posting things that had, ehh, let's say, less than reasonable understanding, claiming people would blow themselves up making a nitrous/propane autocascade haha
    Last edited by aenigma; 09-10-2019 at 09:49 PM.

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