Crank trigger signal, runout, refrigerator magnets in the wheel?

[Jorgen Karlsson]

Is the magnets in the Crane trigger wheel installed from the side of the
wheel? It looks like it on the picture and I know that MSD does it that way.

It is hard to get the distance from the magnet to the trigger down to 0.100"
with this setup. At least that is the absolute maximum distance on my
trigger.

Maybe you could install a set of Haltech magnets along the outside perimeter
of the wheel.

Jorgen Karlsson
Gothenburg, Sweden.

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of clayb at sonic.net
> Sent: Sunday, May 06, 2001 7:44 AM
> To: diy_efi at diy-efi.org
> Subject: Crank trigger signal, runout, refrigerator magnets in the
> wheel?
>
>
> Hi guys,
>
> I think I'm having trouble with the signal reliability from my Crane
> Cams crank trigger.
>
> The trigger wheel is Crane Cams Hall effect. I hooked up the scope.
> Unless the
> scope is glitching at 12 Hz (150 RPM cranking speed), that crank trigger
> is glitching. I've had this Autronics/Crane trigger setup working in the
> past, but it has proved very proximity sensitive. The trigger wheel
> wants to be rubbing against the Hall pickup, perfectly centered, with
> .000" runout.  but after I installed a new engine (same balancer and
> trigger arrangement) the trigger became intermittent, again! I've had
> the new engine running also, of course. But it went intermittent again
> 100 yards from shore. Grrrr...
> The plugs stopped sparking, but there was still fuel going
> through the injectors, according to my nose.
>
> According to the scope, the cam pos sensor is fine.
>
> I believe, based on past experience with this stupid trigger, the "43"
> code
> thrown by the computer, the traces on the O-scope, and the lack of
> ignition firing, that I may have a problem with magnetic field strength,
> runout, Hall sensor sensitivity, etc. I measured the wheel
> runout at .040". What do they expect out of a wheel centered by the
> three pulley bolts?
> Sure, the wheel isn't perfectly in line with the center of the Hall
> sensor, but the center of the sensor is still "covered" by the wheel.
> I'm starting to think this setup just ain't gonna cut it. I'm
> going to make some phone calls, and check the magnet strength, but I
> strongly suspect the Crane is ill designed and has weak magnets,
> creating an unreasonable proximity requirement.
>
> http://www.cranecams.com/ignition1/ctrigger.htm
>
> MSD mentions rare earth magnets. I think the Crane trigger wheel magnets
> are ex-refrigerator units!
> http://www.msdignition.com/1msdcrnk.htm
>
> Has anyone had experiences with this particular brand of crank trigger,
> or suggestions on how to fix what I have? I'm hoping the Hall sensor
> itself is OK, as it is already mounted with bracket and adjuster. (It
> does, by the way, respond to a medium Gauss magnet placed against it.)
>
> - Clay
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