Ok so as you will see in the video I compared evacuation times with different size hoses.. Here are the results in mins:secs
Using the AK900 Manifold with all 1/4" diameter hoses and schraders installed: 19:53
AK900 Manifold with (2) 1/4" hoses and center 3/8" hose schraders installed: 9:18
One 1/4" hose directly to pump with schraders installed: 9:10
One 1/4" hose No schrader installed: 3:50
One 3/8" hose No schrader installed: 1:50
One 1/2" hose No schrader installed: 1:19
So I concluded evacuating through your manifold causes an added restriction and increases the amount of time to get to the same 300 micron value. Even with (2) 1/4" hoses and (1) 3/8" "vacuum" hose I can still pull that small length of tube down faster with one 1/4" hose, leaving out the manifold.. Now we really start cooking once we pull them schrader cores out..
Also in the video I used two different micron gauges. I still find myself using the Thermal Eng. Gauge every now and then. THere is something about it I like..
Let me know what you guys think.