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

[The Punisher]

That would not give you time to stabelize the readings. use centrifugal 
vaccum motors in parallel. It works. I'll try to post a picture on the 
diy-efi website tonight if I can.


From: Brian Dessent <brian at dessent.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: Tue, 05 Feb 2002 16:51:55 -0800
>
>Daniel Houlton wrote:
>
> > Yes, I would want some oxygen to get into the engine.  Which is
> > why I'm questioning why you'd use less than 1 psi to flow test
> > a head when there's in the order of 14 psi (on a NA motor)
> > pushing through the intake valve at WOT?
>
>There may be atmospheric pressure on the upstream side of the port but
>that doesn't mean the cylinder has a vacuum, in fact it's probably quite
>close to atmospheric as well, depending on about a million factors (cam
>timing, exhaust backpressure, etc...)  That nice 18"Hg idle vacuum is
>created by the throttle plate being closed.  The actual pressure
>difference across the head at WOT is probably quite close to 25" or 28"
>WC.
>
>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
>
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