Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Mechanical and Venturi Vacuum pumps

emsvitil on Fri September 10, 2010 8:52 PM User is offlineView users profile

Year: 1986
Make: Toyota
Model: Pickup SR5
Engine Size: 2.4
Refrigerant Type: R12
Ambient Temp: NA
Pressure Low: NA
Pressure High: NA
Country of Origin: United States

It's my understanding that a mechanical pump is more likely to spit oil and water contaminate the oil when it's initially started.


So is it worth while to pull the initial 28" or so with a venturi pump (since I have one) then switch to the mechanical pump?

BTW, I can get to 28" in under 5 minutes with the venturi pump.

-------------------------
Ed
SoCal

TRB on Sat September 11, 2010 5:38 PM User is offlineView users profile

I don;t believe 29 Hg is low enough to boil off moisture. 1000 microns or lower is needed. I prefer a dual stage vacuum pump over a venturi type. Plus with a venturi you air source will have moisture in it unless you have an elaborate filter system like paint shops use.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

emsvitil on Sat September 11, 2010 11:27 PM User is offlineView users profile

I know 29" isn't enough.........

The question is does using the venturi pump for the initial vacuum help prolong the life of the mechanical pump, the mechanical pump's oil, and help prevent the loss of the mechanical pump's oil...........

-------------------------
Ed
SoCal

NickD on Sun September 12, 2010 6:56 AM User is offline

Vacuum pumps suck, and will suck anything you provide to them. So why are you connecting any kind of vacuum pump to a source loaded with crap? I don't see water or dirty oil spiting out of my two stage pump. Venturi pumps work on the principle of passing huge volumes of air past a very small orifice that is angled in the direction of this air flow. That air flow doesn't make a U-turn to go back into the source. And granted, it would a lot easier to clean with even less internal damage than a precision two stage vacuum pump.

But you don't connect either to a septic tank or sh!t will be flying all over the place. Suggest you clean your system first.

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.