robinair 15500 or mastercool

[shaworth1]

just wondering if anyone has had one of these vacuum pumps, looking for a good economical pump. Thanks for your input.

[Damien]

I'd say neither! Threw away each of those at the end of last summer, both needed parts. Parts were damn near the same price as a new JB

[mark beiser]

Choosing between Robinair and and Mastercool is kind of like choosing between a 1988 Yugo and a 1988 Dodge Colt....

(Note to self: Research newer crappy car equivalencies.)

[akelesis]

i walked into the supplier the other day and at my supply house they have started the sales on seasonal stuff already. im thinking of picking up myself a bullet vac pump and a micron gauge vac pump goes for approx $ 299 and the micron is approx $150-200 cdn. you should really go walk into the supply houses things are always on sale at the beginning of the season. i remember getting my analog gauge(YJ) and 5 ' hoses w ball valves for approx 120 and i got a shrader core remover kit with isolating ball valve for like 40 bucks. i kinda happy that morning but broke at the same time.

The supply house that i use is called Eastern Refrigeration supplies. aka Masters

[rdholder]

Have tested both Robinair or Mastercool 90065 and they both work well. Tested a single stage 6 CFM and a two stage 1.5 CFM the 1.5 got to 500 microns first and went to 25 microns the 6 CFM took 4 time longer to get to 6000 microns.

[jpsmith1cm]

Have tested both Robinair or Mastercool 90065 and they both work well. Tested a single stage 6 CFM and a two stage 1.5 CFM the 1.5 got to 500 microns first and went to 25 microns the 6 CFM took 4 time longer to get to 6000 microns.

I'm curious.

What testing protocol did you use?

[rdholder]

I'm curious.

What testing protocol did you use?

The test was to see how long it will take a single stage and a smaller two stage Vacuum pump to get to 50 microns. The protocol used to fine the answer is by using the same vacuum gauge Supco VG64S and a 4” ¼ hose from a Refrigeration Technologies Checkmate Device, putting Nylog on all fittings, new vacuum pump oil in the new pumps and timing the test. After heating each pump for 15 minutes we put the vacuum gauge on and timed each pump from start to 12000 microns and as it when down to 50 microns. If a vacuum pump will do 50 microns in 5 minutes it is a good pump but if it stops at 200 microns change the oil which should be change every time it is used.
The test show that two stage pump will outperform a larger single stage pump.