Building a Flow bench, was: Measuring air flow

[Kris Weldy]

What would that power be -compared to a roots blower,one uses torque
supplied from the motor ,the other uses expanding exhaust gases..IM very
curious on this topic!---Your friend,
Kris Weldy
Arlington Texas
88supra turbo auto 9.1 1/8th
aim :volvofam3     --
yahoo:supratheonlywaytofly
www.turboboss.com
Assistant Manager

----- Original Message -----
From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Sunday, January 27, 2002 7:55 PM
Subject: Re: Building a Flow bench, was: Measuring air flow


> ECMnut at aol.com tapped away at the keyboard with:
>
> > I gave this some thought also.
> > Maybe a stolen blender motor?
> > Wouldn't you also need to
> > setup an oil pump for the turbo?
>
> If you're looking at comparable flow rates, you need a powerful
> motor and a comparably-efficient means of moving air. Back in 1979,
> I built a flow rig that used a large Rootes blower off a Nissan
> truck, driven by a 10hp electric motor. A 200-litre drum was used as
> a (tunable) flow damper.
>
> A fractional-hp motor probably isn't going to do the job of
> providing both the volume of air and the required pressure.
> Remember; it's mass air flow in which you're interested. Calculate
> the power required to accelerate a stationary air mass to the
> required velocity through the meter.  If downstream of the meter is
> near-atmospheric, power requirements will still be moderate.
>
> I worked out that the inlet noise damper in my car required at least
> 300W to operate at maximum (rated) engine power, without taking into
> account flow inefficiencies. That's why the thing has been sitting
> on the shelf for the past 7 years.
>
> Consider the pumping losses in your average engine. Although you
> won't have to suck air through tiny valve openings and (perhaps
> badly-tuned) inlets, there's quite a bit of power lost in breathing.
>
> Consider also the power that your average turbo consumes to give you
> one atmosphere of boost.
>
> --
> /"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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