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Path: utzoo!watmath!clyde!cbosgd!ihnp4!tellab1!tellab3!thoth
From: thoth@tellab3.UUCP (Marcus Hall)
Newsgroups: net.auto.tech
Subject: Re: Fuel Injection
Message-ID: <311@tellab3.UUCP>
Date: Mon, 20-Jan-86 13:21:46 EST
Article-I.D.: tellab3.311
Posted: Mon Jan 20 13:21:46 1986
Date-Received: Tue, 21-Jan-86 07:46:16 EST
References: <369@cbuxc.UUCP> <459@tekig4.UUCP>
Reply-To: thoth@tellab2.UUCP (Marcus Hall)
Distribution: net
Organization: Tellabs, Inc., Lisle, IL
Lines: 33

In article <459@tekig4.UUCP> rickb@tekig4.UUCP (Rick Bensene) writes:
>> Many new cars are advertising different types of fuel injection; multi-port,
>> throttle-body, etc.  Would anyone care to give a short tutorial on fuel
>> injection in general, and how if any these 'variants' differ from REAL
>> fuel injection?  Or are they just names dreamed up by a marketing dept.
>> 					Thanks In Advance,
>> 						Mike Vehonsky
>
>Multi-Point FI:  Much like the Tuned-Port system mentioned above, minus
>the 'tuned-port' intake.  Individual injectors feed the intake ports
>of the heads.  On some systems, there are more than one cylinder
>served by each injector.
>
My Fiero V6 has multi-port fuel injection and tuned induction.  The injectors
are wired in two circuits with three injectors each.  This means that the
injectors fire three times for each engine cycle.  I don't know why this is
done except to minimize the complexity of the computer control, I guess.

I would suppose that sequential-port injection would actually have seperate
circuits for each injector and they would be fired only once per cycle.

At any rate, I believe that multi-port injection means that the injectors are
fired in groups, and sequential-port means that they are fired one at a time.

I await any corrections..

marcus hall
..!ihnp4!tellab1!tellab2!thoth

p.s.  Does anyone know the REAL reason why multi-port injection is used?
 It seems that injecting gas at any time other than the intake stroke implies
 that the mixture cannot be controlled as well.  How possible is it to convert
 a multi-port system into a sequential-port system? (probably not very :-()