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From: mat@hou4b.UUCP (Mark Terribile)
Newsgroups: net.auto
Subject: Re: Carbs
Message-ID: <1387@hou4b.UUCP>
Date: Fri, 26-Apr-85 17:46:16 EDT
Article-I.D.: hou4b.1387
Posted: Fri Apr 26 17:46:16 1985
Date-Received: Sun, 28-Apr-85 08:37:11 EDT
References: <991@vax1.fluke.UUCP>
Organization: AT&T Information Systems Laboratories, Holmdel, NJ
Lines: 37

>Correct me if I'm wrong, don't carbs use velocity to meter fuel?  Isn't this
>what the venturi principle is all about?

Carbs meter fuel the same way that airplanes fly: Bernoulli's principle.

There's some pretty physics involved in demonstrating it, but what it
amounts to is this:

	Given a volume of fluid travelling past a surface, the energy
of that fluid is a function of the velocity of the fluid and the pressure
the fluid is under, multiplied by the volume of the fluid.  In order for the
energy balance to work out (I am miles away from my textbooks and my intuition
is too rusty to work it out ...) the pressure that the fluid experiences
perpendicular to the direction of travel must be less than the pressure it
would be seen to experience if it were at rest.  As the velocity increases,
the pressure must decrease.



	--->	--->	--->	--->	--->	--->	--->	--->
				F L O W
	--->	--->	--->	--->	--->	--->	--->	--->

	------------------------------         -----------------------
				     | .  .  . |
				     |  .  .  .|
				     |.  .  .  |
				     |. .  .. .|
				     |. .   .. |
				      reduced
				      pressure
-- 

	from Mole End			Mark Terribile
		(scrape .. dig )	hou4b!mat
		on 5/1/85 ..,,.		mtx5b!mat
    ,..      .,,       ,,,   ..,***_*.