I spoke with an expert earlier, (fred again)
I tested and rechecked my measurements of the distrbutor.
The actual sensor appears to be thishttp://www.digikey.com/catalog/en/partg ... nsor/23556
a mini vane hall effect sensor.
The three wires of the "mini vane hall effect sensor" connect to the napa TFI (6 wires) module. (more information here :: http://www.therangerstation.com/tech_li ... _tfi.shtml
(more information here it also lists a vane hall effect sensor http://www.therangerstation.com/tech_li ... stic.shtml
I applied a 3.99 volt to the module's ignition on wire, and ground, and I carefully measured the "PIP pin" on the napa module that goes to the 1986 ecu.
When the metal of the wheel was directly between the "mini vane hall effect sensor" 's coil and the magnet, I read 3.74 volts constant.
When only air was directly between the "mini vane hall effect sensor" 's coil and the magnet, I read .002 volts constant.
At 0 RPM this was my measurement.
When I rotated the distrbutor faster(10 rpm), voltage averaged out to 2.2? 2.7?. My multimeter has slow updates.
I carefully measured the vane wheel with my 6 in. Digital Caliper these are the measurements.
Each metal tab measures .550 inches wide.
Each gap between the metal tabs is .643 inches wide.
The total diameter is 2.36 inches.
Doing a bit of math on my measurements:
(.550 + .643 ) * 6 = 7.158 inches circumference based on (vane + gap) * 6. (note this calculation is more about a 12 sided polygon's parameter
(2.36 ) * 3.14 = 7.410 inches circumference based on OUTSIDE diameter measurements.
Redo:: I do not understand fully. I might be measuring the air gap incorrectly due to the thickness of the vane plate .02 inches . The outside diameter of the vane cylinder is .04 more than the inside diameter of the vane cylinder.
(2.32 ) * 3.14 = 7.2848 inches circumference based on INSIDE diameter ESTIMATES. = 7.410 inches circumference based on OUTSIDE diameter measurements.
For fun lets make a .02 allowance of error for each vane and each airgap. (12 total ) .24 + or minus.
Subtract our values: 7.410 - 7.158 = 0.252 ........... oh well..
as for the angles::
Vane is ( .550 size / 7.2848 estimated circumference ) * 360 degrees. == ARC length as percentage of circumference * degrees ===== 27.17 degrees
Air gap is ( .643 size / 7.2848 estimated circumference ) * 360 degrees. == ARC length as percentage of circumference * degrees ===== 31.77 degrees
6 vanes and 6 air gaps total degrees:: ( 27.2 + 31.80 ) * 6 = 360 degrees YAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAY