cfm and water lift

i was talking to a dealer who sells and services ninja machines and he said that with a porty higher water lift was more important than cfm. what do you think ? i want to use a 360.                                                                      

200ft........ .... 50psi.....

Abnormal Psych.....he was the class example

rick007 wrote: i was talking to a dealer who sells and services ninja machines and he said that with a porty higher water lift was more important than cfm. what do you think ? i want to use a 360.

I've read a few other articles on the subjects, still don't completlly get it?

Parallel is NOT always the way to go. The best way to measure vac motors is UNDER load, not NO Load conditions. You don't clean that way. you clean with the equivalent of a 3/4" opening. That produces approx a lift of 70"WL and 30 cfm from a single 3 stage vac motor with 25 ft of hose connected operating thru a wand cleaning on the carpet. If you were to run 2 of those vacs in parallel, you would NOT double your vacuums under those operating parameters. Your lift would only rise to 80"WL but your cfm would still be only about 40. Why? Because the resistance at the wand/carpet interface is so strong that without an increase in lift, not much additional air can make it thru there.

If instead the 2 vacuums are in series, the lift will rise to 130"WL, and CFM rises to 50 cfms. That is because the air pressure differential between the air outside the wand(atmospheric)and inside the wand is now greater, causing more air to enter the wand. The resistance at the WCI is the same, but the ability to overcome it has been increased.

So now you know why the Ninja is hooked up in series, not parallel. It works better. Century did extensive testing on both configurations before deciding and PROVING that series works best.

Kenny is smoking crack again. In a system that has 200 cfm, 30 cfm is only 15%. The waterlift is barely affected. In a series, the max cfm is 100 with no load. If you have 50 cfm leaking into the system, you've reduced your waterlift by about 50%. Hence the confusion on Kenny's part.

Edited by FriendlyHammer - 18/February/2008 at 7:51pm