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 cut out a 1/2"  [aluminum?] disc. Bolted it to a front pulley. The diameter the same as a Mr. Gasket degree wheel.

I drilled through the disc near the edge. I pressed through a 1/4" bolt. I trimmed off the bolt to be flush front and back. In the lathe I turned down the diameter of the disc until I cut into the side of the bolt so as to expose about 1/3 of the bolt diameter on the edge of the disc.

I mounted two Chrysler pick ups from a 70s style electronic distributor. One on each side of the front cover
180 degrees apart. One to fire the front housing and the other to fire the rear housing. Both used coils from an Oldsmobile. Total loss double ended coils. The pickups cost about $5.00 each. The Dodge/Plymouth/
Chrysler amplifiers cost $20.00 each. A ballast resister for each amplifier cost $7.00 each.

Runs great. Solid timing up to 9,600 RPM. The degree wheel makes ignition timing dead easy. The smooth disc makes for a safer setup. You can touch the disc while the engine is running. Nothing sticks out to snatch the timing light out of your hand. Later that same rig ran two MSDs and two MSD double ended coils.
Same result

Lynn E. Hanover



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