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Re: Fuel vapour, non tiger

To: Tom Witt <wittsend@jps.net>
Subject: Re: Fuel vapour, non tiger
From: Steve Laifman <SLaifman@socal.rr.com>
Date: Wed, 16 Oct 2002 11:15:26 -0700
Tom,

With the possible exception of your "fuel porcolation", which must have 
something to do with bacon, it sounds about right.  "What do you want, 
power or economy?", as you seem to say.

There is a simple answer already worked out for adjusting flow to obtain 
target fuel/air ratio.  A mass flow meter is installed in the air intake 
system that measures the velocity and temperature of the entering air 
flow, with a known cross section - hence mass air flow rate. By knowing 
the "target" air/fuel ratio, an appropriate mass of atomized fuel is 
added with known mass (temperature / density / volume).  The resultant 
products of combustion are sampled for unburned hydrocarbons that miss 
the intended efficiency, and the amount of atomized fuel injected is 
automatically adjusted for the next entry.  This is how the modern fuel 
injection systems operate, using a computer for control.

In the advanced models, a detonation sensor is employed to regulate both 
fuel / air ratio, and ignition timing (depending on designer's 
optimization choices) with a "knock sensor".

All this is well and good, but has no place in a classic sport car. (as 
you say - "non Tiger")  Just add cubes, diddle with the valves, cam, 
port flow and carbs, C/R, hotten the ignition, advance until it pings 
and back off one, and go! :-)

Gas mileage cost?  As that movie about the oil industry put it: A junior 
executive at a major US oil company is complaining about the cost of 
imported crude, OPEC, and the Middle East.  The Board Chairman corrects 
him - "Don't you understand? WE are the "Arabs"!

Steve

-- 

Steve Laifman
Editor
http://www.TigersUnited.com

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