Plenums

[Dave Zug]

The way I have thought of it is imagine having a straw sticking out of a
metal sphere filled with air. the sphere has a small intake hole in the
other end (pinhole). If you draw a breath on the straw, and the sphere is 2
inches in diameter, you will produce a vacuum faster (you will evacuate the
reserve faster) than if the ball is 3 feet in diameter and you draw thru the
straw at the same rate. the larger sphere will allow more of a buffer to
rapidly draw-on while the intake is trying to let air into the sphere.
eventially the sphere runs out of reserve, and there is zero vacuum.

With this in mind, imagine a 1 inch pipe run from an intake plenum, on the
other end of that pipe is a 10 gallon cyllinder, sealed to outside. plenum
'reserve buffer' volume is increased but the radiuses are left tight.

I think too much sometimes, sorry.



----- Original Message -----
From: <ae2598 at wayne.edu>
To: <gmecm at diy-efi.org>
Sent: Tuesday, January 16, 2001 7:55 AM
Subject: Re: Plenums


> Maybe the benefit is that it ALLOWS the charge to MAINTAIN
> inertia/velocity?  I think what people are trying to say is that if the
> incoming charge slams into the casting walls, it'll lose some momentum
> that otherwise would've carried it into the cylinder.  Kinda like the
> watter-hammer effect in pipes. True?
>
>
> On Tue, 16 Jan 2001 John_Calabrese at ENGELHARD.COM wrote:
>
> >
> > <<<<It allows the air to lose ineritia and bend around to fill the
runners
> > without having to lose energy.>>>
> >
> > Losing inertia without losing energy?  Man, tell me where to buy that
> > spacer!!  Newton would be amazed!!
> >
> >
> >
> > John L. Calabrese
> > Research Engineer
> > Environmental Technologies Group
> > Engelhard Corporation
> >
>
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