Hi all,
Is there a white paper or technical bulletin for setting up a user defined Crank and Cam pattern? I am asking because I would like to setup an old Nissan CAS which is 360* at 1* increments for the crank and the cam is 6 teeth of varying widths. Also since this is driven by the timing belt, error detection and handling need to be pretty stout as it is quite easy to read the same tooth multiple times due to belt harmonics.

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Hi Alex,

There isn't much documentation I'm afraid as user defined cam crank is quite complex if user defined is needed as opposed to standard N-M. Typically user defined cam crank setup is something that we normally do and setup on our autosim but isn't a 5 minute job.

Have you got a diagram of your crank and cam wheel that you can post? Or a tooth diagram of the trigger teeth of both cam and crank reference cylinder 1 TDC?

Many thanks,


Cosworth Support
Cosworth Electronics 

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Kind of. If I could get a scope trace or make a spread sheet using a degree wheel a scope and time would that work?
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If you have access to a pico scope to trace the CAM and Crank signals that would be perfect as you can measure crank angle with in the pico scope software very well.
This also gives you the voltage readings so the thresholds can be set accordingly. scope.JPG 

Martin Burmeister
Senior Applications Engineer - Pectel

Tel: +44 1954 253703  |   Mobile: +44 7815 008541   |  Email:
Cosworth Group Holdings Ltd, Brookfield Technology Centre, Twentypence Road, Cottenham, Cambridge, CB24 8PS, England

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Unfortunately I do not have a Pico scope. I do have a scope though that would give me a readout of crank and cam but no real way of finding where the teeth are relative to TDC.  
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Put a degree wheel on the crank and connect the ecu.. as these sensors are optical they will put out a square wave..   bring up the raw voltage values for crank and cam.  as the crank is every degree, that is pretty obvious.
    note when the voltage is high (5v) it can be when going into metal or when exiting metal, do this for both sensors..
   check at TDC where the crank tooth is, going into or out of volts, how close the tooth is to tdc..
  Then degree in all the cam teeth.. note which edge is going into metal and which is going out..   that should be enough info.  
  Just beware with nissan that you keep the rotation to keep tension on the belt as the sensors are on the cam not crank..

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