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

[Programmer]

What's the amplitude voltage in the signal ? Can you
send me your scope pattern ?

Lyndon.
----- Original Message -----
From: <clayb at sonic.net>
To: <diy_efi at diy-efi.org>
Sent: May 5, 2001 11:43 PM
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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