Shop vac Question

[boo coo tracks]

I have 2, 16 gal. (3.5 HP) shopvacs, one has exaust port with same size as intake port.
This is a nice feature as you don't have to breathe dust, just run hose outside. My question is I rig up pipe to Y to both vacs., will that double the vac power??????????? I will use a 25' intake hose.
TIA
Tracks

 

[bomber]

man, it's been years since I ddealt with this kinda thing at work, but I'm thinkin the answer is no, it won't double the vacuum - - - - - if vac 1 will pull 10 inches of water (just an example), and vac 2 will also pull 10 inches, what you'll see at the nozzle is 10 inches . . . . .

 

[Lhorn]

Interesting question. I have no science to back me up, but I'd think that if you use a "y" to connect both vac's together and are sucking through a single hose, you'd get more vacuum but it wouldn't be twice as much as one, largely because restriction through the hose would mitigate the suction a bit. I'm sure this is kid's play for an engineer, so I'm sure someone will set us straight.

Or maybe, you'd get similar suction (ie cm of water or whatever unit you choose), but will more more CFM. Similar to a shopvac vs a dust collector. Shop vac has a lot of suction but doesn't move the CFM to replace a dustcollector.

 

[Steve in Mi]

I have 2, 16 gal. (3.5 HP) shopvacs, one has exaust port with same size as intake port.
This is a nice feature as you don't have to breathe dust, just run hose outside. My question is I rig up pipe to Y to both vacs., will that double the vac power??????????? I will use a 25' intake hose.
TIA
Tracks

You pretty much have the equipment you need to test the theory,i.e., check for any improvement of the two vac's in tandom. The hose from the vac with only the suction port plugged into the outlet/blower port of the second vac and the inlet/suction side from that vac for testing. Need a way to quantify any improvement such as the verticle distance say a 3/4" wood cube can be lifted/sucked into the hose of the tandom vac setup vs. a single vac.

I don't have an answer for you though I would expect some increased vacuum.

I have questioned the same especially when I see the advertisements for the duel motor setups. They are available in both Vacuum and Blower models under various names but this will show the type I'm referring to. The Metro Air Force Blaster Dryer.
http://www.customdynamics.com/air-f...tro_Air_Force_MASTER_Blaster_Motorcycle_Dryer
The Master Blaster is two 4 HP motors (inline) and if you check out Specification #2 (a pdf) the claim is up to twice the air velocity with that second motor. How does that relate to vacuum????

Good luck with your test and please report back with your findings.<!--mstheme-->