DIY flowbench?

[John Dammeyer]

Furnace Blowers use a squirrel cage impellor which don't work well under
load. Their performace drops dramatically as either the intake or
exhaust is blocked.

For example I am now using centrifugal blower for my foundry furnace
after changing from using an identically sized squirrel cage which I
found didn't have enough oomph. The centrifigual unit also runs at half
the RPM.  (as an aside I melt 4 lbs of Aluminum using propane in about
13 minutes.)

I'd also look at drawing air from the cylinder head side rather than
blowing from the throttle plate side which is why I suggested the
sawdust extraction system.

John


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org 
> [mailto:owner-diy_efi at diy-efi.org] On Behalf Of Shirley, Mark R
> Sent: Wednesday, July 11, 2001 5:46 AM
> To: 'diy_efi at diy-efi.org'
> Subject: RE: DIY flowbench?
> 
> 
> Why not use a couple of big furnace blowers?  They move a lot of air.
> 
> > -----Original Message-----
> > From: Eric Fahlgren [mailto:efahl at adams.com]
> > Sent: Wednesday, July 11, 2001 8:15 AM
> > To: diy_efi at diy-efi.org
> > Subject: Re: DIY flowbench?
> > 
> > 
> > John Dammeyer wrote:
> > > 
> > > I'd look at using a sawdust collection system without the
> > bags.  Those
> > > centrifugal blowers are rated in CFM so it should be pretty
> > easy to spec
> > > in a 650cfm or 1000cfm dust collector that can spend most
> > of it's time
> > > keeping the wood working shop safe and part of the time 
> serving as a 
> > > major vac source.
> > 
> > I've considered using a leaf blower to power one, they can 
> pull quite 
> > a vacuum.  One of my kids used on once to build a wind 
> tunnel of sorts 
> > for model rockets.
> > 
> > -- 
> > Eric Fahlgren                            Mechanical Dynamics, Inc
> > efahl at adams.com                          Ann Arbor, Michigan, USA
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