Cam position sensing w/o a cam sensor

[Jason Haines]

Some of the new ignition systems determine the cam position through
ionization energy or similar voltage/spark plug related methods. The new
L850 "world" 4 cylinder from GM (that is in the Cavalier, Sunfire, Vue
(Saturn), Opel (can't remember the model), etc. ) uses this method. No cam
sensor - uses the individual cylinder ignition system to determine cam
position. I wonder how quickly it figures it out. I am not sure what
manufacturer makes the PCM/ECM.

Jason



----- Original Message -----
From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Monday, November 26, 2001 8:10 PM
Subject: Re: Cam position sensing w/o a cam sensor


> Santi Udomkesmalee tapped away at the keyboard with:
>
> > let me clarify my situation a bit.  The engine is a motorcycle
> > engine which uses a DIS system (nothing on the cam to drive
> > distributor/fuelpump).  The reason why I'm trying to find
> > something other than a Cam sensor is that I am having trouble
> > mounting it.  Then cam is driven my a sprocket mounted in the
> > center of each of the two cams.  So reading off of this sprocket
> > is pretty hard due to the position of the sprocket, and the lack
> > of room in that area.
>
> How about using one of the valve rockers for a reference and the
> crank for intermediate?
>
> --
> Bernd Felsche - Innovative Reckoning, Perth, Western Australia
> --------------------------------------------------------------------------
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