Date:         Sun, 14 May 2000 10:08:35 -0400
Reply-To:     David Beierl <dbeierl@IBM.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@IBM.NET>
Subject:      Re: dwell
Comments: To: Mark Rokus <marokus@VOYAGER.NET>
In-Reply-To:  <007701bfbd52$70c21a00$5c14abd0@laptop>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 23:13 5/13/2000, Mark Rokus wrote:
>Yes, Pertronix are Hall effect based.  A hall sensor turns on based on the
>strength of the magnetic field that they see, thus, it is logical to
>conclude that you can effect the dwell by changing the distance from the
>collar (with the magnets in it) and the sensor.  ie... the closer the
>pick-up is to the collar (magnets) , the longer the sensor will see
>it.  Obviously, if you get too much of a gap, the pulse will be shorter.

It's logical, but it's not so...decreasing the gap will do nothing (until
you get physical interference), and decreasing it will perhaps make the
timing a little late -- or a bit mushy (until the thing stops working at
all).  But the sensor only provides information to the control module; it
has no direct effect on the output.  Once the control module knows when the
spark is wanted, it generates a pulse without further regard for the
Hall-effect sensor.

david
David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
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