[EFI] Re: [EFI] Re: Building a Flow bench

[The Punisher]

I think you'll want to drill youre plate then take it to somebody and have 
them flow it on a comercial bench for calibration.

From: "The Dupuis" <dupuis10 at telusplanet.net>
>Reply-To: diy_efi at diy-efi.org
>To: <diy_efi at diy-efi.org>
>Subject: RE: [EFI] Re: [EFI] Re: Building a Flow bench
>Date: Wed, 6 Feb 2002 06:46:28 -0700
>
>
> > As far as a flow bench is concerned... I did a quick calculation, and it
> > seems that if you took a 20 gallon tank, pressurized it to 120 psi
> > (assuming you do it slowly or let it cool), then could somehow release
> > it very quickly, you could achieve your 25" water column pressure at 200
> > cfm for like 6-7 seconds.  The numbers are approximate, and the valving
> > would probably be really tough, but it would let you take your time
> > building up the air mass with any old compressor and then let it go in a
> > hurry.  I've also completely avoided the temperature / condensation
> > issue.  But hey, it's a shot.  I'm sure someone's tried it and failed.
> >
> > Brian
>
>Well, since I started this thread, I guess I should add something here.
>First off, between 6 second bursts of flow, 20 gallon drums(at 120 psig!)
>and my Turbo Volvo on jackstands, sixteen vacuum cleaner motors are 
>sounding
>better and better!!! ;-)  Actually, after reading the PHR article on
>http://www.spiritone.com/~eoa/Cars/Flow_Bench/Flow_Bench.htm, it seems like
>4 good sized motors will do fine.  The article stated that 16 motors were
>good for 100 CFM each at 28", and I'm looking for max 400 cfm to test a
>cylinder head.  The bench is pretty impressive too, allowing blow-thru and
>draw-thru testing.  If it weren't for the thousand other projects I'm
>currently crying in my sleep over, I might start this one too.  At the 
>start
>of this, I was looking for advise on how to use a MAF as a flow tester, and
>I got pointed towards the archives (where I found nothing...), and somehow
>it evolved into this.  Oh well - the article showed me how to build what I
>need, so thanks everyone.
>
>To someone who has the article - the airflow manometer has a special scale
>that is linear and inclined.  The orifice plate is designed to flow a
>certain amount of air based on a certain amount of water column depression
>across the orifice.  The article gives an example of what the scale looks
>like and gives a slope of the manometer, but without the length of the 
>scale
>mentioned or the actual amount of WCD known, I can't estimate the airflow.
>I could still use this as a relative comparison between modifications, but
>I'd prefer to have a formula that will allow me to calculate airflow
>desired, WCD, orifice area, and operating pressure.  That way I could 
>design
>my own orifice meter and my own percentage manometer.  If anyone has this
>formula, I'd appreciate it if they could forward it to me.
>dupuis10 at telusplanet.net
>
>Thanks.
>Matt
>
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