Paul,

           Can the RX-8 sensors work in a
         reverse logic scenario?

           Use a solid metal trigger wheel
         with a hole instead of a tit,

           The voltage would be high until
         the sensor saw the hole.

           Use an inverter chip before the
         CDI or MaxiMite permitting
           triggering on the negative
         pulse.

           Probably adds more issues or
         trading one set of problems for
           another.

           Joe Berki

         That is not how they work. They work on
         a change in magnetic
         properties. They might work with a
         hole. Make a test plate
         and chuck in a drill motor. If you have
         a scope you will see what
         the pulse, if any, looks like. Take a
         picture of the scoop face.

         The best thing is get a water jet
         company to make the plate
         as you need the elongated mounting
         holes for timing adjustments.

         Your email editor is inserting blank
         lines between sentences
         for some strange reason :-)


         Paul Lamar

        Paul,
        This is what I use to time my combustion pressure tester.
        I used an optical sensor at first but it was very intermittent. When we switched to the Hall Effect sensor HET it became very reliable.
        There are slots cut into the standard 3rd gen timing wheel. (The shinny surface was used for the optical sensor).
        Barry Bordes


         Yes. They are easier to mount. Much much smaller in some cases. This one looks
        about the same or larger than some wheel magnetic sensors.

        Paul Lamar



    This picture shows a magnetic pickup sensor, similar to ones used on the flywheEl of industrial Diesell.  They generate a sine wave, to appropriate decoderived,  usually inside the tach. Some say they are hall effect. I am doubtfully,  not looking at all similar to the hall effect sensors I have seen. A metal disc goes between 2 sides of the hall effect. Most always on this topic, I need to be educated.
    Stee Carlisle

    They do make some of them that look like that.


    Paul Lamar

    I am attaching photos of a VRS (Variable Reluctace Sensor) by Honeywell. This sensor was used in liquid flow measurement turbines for "totalizers". There is two part numbers for different sensitivity. If I remember correctly this one (H 3030AN) was used on turbines less than 7/8". They have a magnet and core. The core is the small metal piece in the center of the blue. There is a coil around the core that changes reluctance when something ferrous comes close to the core. If you connect a multimeter to the two AN pins and rub the sensor against a pipe wrench adjuster threads, you can read a frequency or Hz.

    Other companies manufacture the same item. Many are used in industry for speed (RPM) measurement and position sensors. Heavy trucks have used these for tachometer pickups for years. Very reliable but heavier and more expensive than automotive hall effect and wheel speed sensors which I think are VRS.

Dale Davies

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