Sat Feb 07, 2009 3:46 pm
When you look at the internal construction of a vacuum blower, you'll see that they have diffuser vanes in place outboard of the compressor wheel. This is exactly how a turbocharger works. These vanes convert airspeed into pressure. It's like comparing a roots supercharger and a centrifugal supercharger. They both do the same thing, but you gotta get the centrifugal really singing to do it. The roots blower may only be doing like 10,000RPM, and the centrifugal will do 100,000! I have that bank teller blower I converted, and it puts out a lot of pressure. Easily 6PSI, just not at the volume that the T-Bolt needs to run at max volume.
In contrast, look at the construction of a leaf blower. It is all about airspeed. It has no diffuser, and it can really put out a large volume, but the second you put any kind of pressure head on it, the blower wheel surges, and loses efficiency.