Vacuum Pump question.

I was wondering if this pump would work okay.
http://cgi.ebay.com/ebaymotors/ws/eB...983446377&rd=1
I know it is not the best but I don't have much to spend.

I have a nice one that some one gave me befor I got into Xtreme cooling but I did not know what it was and I think that messed it up :( . (I ran water through it) It ran nice to I think it has a 1/3 hp moter. I got it back out and it was locked up (from rust) I got it moving again and I am going to open it up and see if I can get it to work again but if not would this pump work as a backup plan?

Thanks in advance

air driven pumps won't pull a deep vacuum, so they will not remove moisture.

Hmm it says right on the page that it IS for A/C's

Yes, but the purpose of it is not to remove all air and moisture... its for car, so its most likely to just completely remove the gas.... Which 28HG is enough for that... but not enough for a good evac.....

Okay so it sounds like that vac pump wont work. Is there any thing that I could get for 35 shipped or less that would do the job?

Ummm.... 35$ shipped? You need to be lucky or have good friends I guess.... I am myself looking for one around 120$ not shipped and its hard...beleive me....lol.... So 35$ is very unexpected....

Quote:

---

Originally Posted by _HL4E_HalfLife_

Hmm it says right on the page that it IS for A/C's

---

Trust everything you read on Ebay huh?

You should know, that not everyone is honest about how good what they're selling is. And Ebay thinks they can just wash their hands of it... HAH!

You want to get something get something like this for example.

IT sure beats the hell out of that retro looking thing. It doesn't have to be THAT, but THAT is a bona-fide AC system, not for a car, evacuation. :p

There are plenty more there if you just look under vacuum pump, and stay away from the funny looking stuff. And the "Sold as is, we do not test" kinda crap.

erm, lemme edit that...

Wait, cant you use a compressor as an vac pump?

If you ran actual water through it, and let it sit, it's pretty much junk, and the same if you pulled a real lot of moisture out of a system, and let the pump sit with all that moisture-contaminaited oil in it, it is almost junk now. Rebuild time for it. If that costs too much for your needs, then be ready for at the least a couple of triple-evacuations and filter dryer changes before you can even think it will work for very low-temperature applications reliably.

okay what about this one
http://cgi.ebay.com/ws/eBayISAPI.dll...ayphotohosting
If this one wont work then I will try to get the one I have to work.

I personally dont like ebay, but if thats what you're after

http://cgi.ebay.com/ws/eBayISAPI.dll...983303688&rd=1
http://cgi.ebay.com/ws/eBayISAPI.dll...526563330&rd=1
http://cgi.ebay.com/ws/eBayISAPI.dll...526918450&rd=1

Repeating my question: Can't you just use another compressor to vacuum?

It's my opinion that you can't use compressors full stop, yes they move air and yes they work to a certain degree(poorly) and yes, some people will use them (wrongly) using compressor is a bodge it and leg it way, cheap nasty method. Perhaps some of you need a good few years in the industry to realise this. There we go, at least the people that use the proper gear can sleep easy at night. :stick:

I find it also rather alarming that very few use vac guages :eek:

Quote:

---

Originally Posted by expansionvalve

I find it also rather alarming that very few use vac guages :eek:

---

what are u refering to? a manifold gauge or a micron gauge? If ur talking about a micron gauge i think the reason very few use one is because there too dam expensive. :(

BTW did you all know that a Vacuum pumps compression chamber is built the same way a rotary compressor's is the only difference is most vacuum pumps have 2 stages so in theory if u connected up 2 rotarys in series they would work just as good as a 2 stage vacuum pump.

Its not just a different chamber. Different mountings, different types of stators, etc etc. Its not as simple as black and white.

hmm i've got a couple of systems sitting here running fine that were vac'd by a compressor.

:stick:

I am watching some pumps on ebay. If I get my systems all finished and still can't get a vacum pump then I may use a compressor. But I realy only want to use it if I have no choice. Does any one know whare I can get a good vacuum pump for $50 or less. Thanks for all the info.

Quote:

---

Originally Posted by _HL4E_HalfLife_

BTW did you all know that a Vacuum pumps compression chamber is built the same way a rotary compressor's is the only difference is most vacuum pumps have 2 stages so in theory if u connected up 2 rotarys in series they would work just as good as a 2 stage vacuum pump.

---

A Porche and a lada both has four wheels....

The vaccum pump was made to extract, the compressor was made to push and pull.... they are not made the way way.... Yes on the same compression theories, but not the same way, and not for the same use...

Quote:

---

Originally Posted by skate2snow

A Porche and a lada both has four wheels....

The vaccum pump was made to extract, the compressor was made to push and pull.... they are not made the way way.... Yes on the same compression theories, but not the same way, and not for the same use...

---

Have you ever opened up a vacuum pump and a rotary compressor and examined them both?

I'm still waiting for someone to post a pic of a compressor(or 2) boiling water at ambiant temperature. do that and it will resolve the issiue.

I would try it wdrzal but I don't have any compressors that I'm not using at the moment.

Quote:

---

Originally Posted by wdrzal

I'm still waiting for someone to post a pic of a compressor(or 2) boiling water at ambiant temperature. do that and it will resolve the issiue.

---

Im trying it as we speak.

Quote:

---

Originally Posted by wdrzal

I'm still waiting for someone to post a pic of a compressor(or 2) boiling water at ambiant temperature. do that and it will resolve the issiue.

---

Well I know one compressor won't do it.. maybe 2 large ones will. Most 2 stage vacuum pumps can pull an ultimate vacuum of 25microns or less, and at 500 microns water boils at -10F or so.

Im changing my duel compressor vacuum pump's layout right now i got 2 compressors in parallel but im changing them so there in series this should allow them to pull a deep enough vacuum to start picking up moisture if not ill add a 3rd compressor in the series.