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Date:         Thu, 13 Sep 2007 15:44:15 +0300
Reply-To:     tinker man <tinkerman007@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         tinker man <tinkerman007@GMAIL.COM>
Subject:      Measuring engine RPM based on Hall sender/coil signals
Content-Type: text/plain; charset=ISO-8859-1

Hello Volks,

I have a 1990 2100cc Digijet engine (European model). I want to measure engine RPM without a strobe light, by connecting a frequency counter to the Hall control unit ignition coil drive output. 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?

Also, looking at the schematic, I see that the coil driver output goes in parallel to the dashbord to drive the tachometer, but also to the main fusebox to two vacant relay positions (2 and 4). Can anyone verify this, and has anyone actually used this signal to add a tach?

Cheers, Tman


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