Need tips on hall sensors and distributors

[miked]

Dear Jurgen,

I am hoping to prevent you from re-inventing the timing wheel.  Here are a
few hints:

Most of the 4 cylinder systems detect a overlap of signals from two sensors.
The two cases I can think about are the 1985-1988 chrysler turbo 2.2 4
cylinders.  The 85&86 models actually had two sensors and trigger wheels
inside the distributor.  The 88 and later had one of the 4 shutters hollowed
out so it got two pulses instead of one pulse for cylinder number 1

The 1991-93 Ford Ranger 2.3 engine with distributorless ignition utilized
two timing wheels and a single bolt on pickup with two hall sensors in it.
The shutter is on the back of the harmonic dampner.
Buick 3-3.8 liter V-6 have a dual pickup, but the shutter wheel is quite
different.  It is on the harmonic dampner

Also VW Golfs with Digifant injection have a very compact hall sensor.  They
only use it for rpm sensing.  This could be convertable??

As far as fabricating a shutter wheel, it is not too restrictive.  There are
several wheels availabe out of the distributors mentioned.  Just remember
that the width of the shutter and the engine speed set the pw of the output
of the sensor.

I have used the Digikey Hall Sensors on a speedometer project.  Not real
good results.  They do not have an internal magnet, so you have to spin a
magnet.  The gear tooth one is very sensitive to gap clearance.  You already
said that there is a temperature range problem.  Go with an OEM setup and
you will get a much more durable sensor.

Mike D.

----- Original Message -----
From: "Jurgen Hartwig" <jhartwig at midsouth.rr.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, April 29, 2001 9:07 AM
Subject: Need tips on hall sensors and distributors


> Guys, I have decided to go with the Autronic SMC engine management system.
> It appears to be a fine system at a very reasonable price.
>
> Since the SMC has sequential injection, I cannot use a crank trigger
alone.
> I have to identify cylinder #1.  I don't have a cam sensor, so my only
> source for the cylinder #1 reference pulse is the distributor.  I have
been
> searching for information about hall sensors over the net, and found
> Cherry's Sensor pages.  Their site helped gave good info, but I am trying
to
> get some ideas of how I can obtain the necessary trigger signals.  For my
4
> cylinder engine, I need one pulse per combustion stroke.  I also need the
> single pulse to identify cylinder #1 at 10-50 degrees BTDC.
>
> I search through the archives and heard of guys making a vane plate for
> mounting in the distributor with a hall sensor.  However, no real details
> were provided.  My other option is to mount a crank trigger for the
> reference pulses, and a distributor sensor for the cylinder #1 trigger.
>
> I am also wondering if I can mount two hall sensors inside the distributor
> for both signals.  I know the OEMs did this, but they also had some custom
> sensors built for their needs.  Unfortunately, I don't have pick-a-part
> junkyards, so digging through junkyards is not an easy task.
>
> As long as the temp range of the sensor is adequate (say -40 to 125 C) can
I
> use any of the $1 hall sensors, provided it has the amplifier and
filtering
> onboard?
>
> Digi-key appears to be the only online source for the hall sensors.  Any
> other companies with which I should consult?
>
> Thanks in advance,
> Jay
>
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org