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Date:         Thu, 13 Sep 2007 09:19:35 -0400
Reply-To:     Mike S <mikes@FLATSURFACE.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mike S <mikes@FLATSURFACE.COM>
Subject:      Re: Measuring engine RPM based on Hall sender/coil signals
Comments: To: tinker man <tinkerman007@GMAIL.COM>
In-Reply-To:  <1b0df96d0709130544m38807d2v6dee2a8a467921c@mail.gmail.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 08:44 AM 9/13/2007, tinker man wrote...


>How is engine RPM related to ignition pulse frequency?
>The motor is a 4-stroke, 4-cylinder, where every cylinder gets a spark
>once in a complete revolution and no two cylinders are sparked
>concurrently (1-4-3-2 firing sequence as per Bentley), so it seems it
>should be a 1:4 relation. Can anyone verify or correct this
>conclusion?


A 4 stroke, 4 cylinder engine will fire twice per revolution. Every
cylinder gets a spark once every 720 degrees (spark, 180o power stroke,
180o exhaust stroke, 180o intake stroke, 180o compression stroke,
repeat), so 4 sparks in 2 revolutions = 2/revolution.
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