Cam position sensing w/o a cam sensor

[Jim Blackwood]

But isn't that a little circular? Assuming the purpose of sensing #1 is
to fire #1 wouldn't sensing the spark to start the process just cause
more trouble?

Jim

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org] On
Behalf Of Jason Haines
Sent: Monday, November 26, 2001 9:42 PM
To: diy_efi at diy-efi.org
Subject: Re: Cam position sensing w/o a cam sensor


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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