Over the last few days I have been testing sensors with the Imfsoft ignition module, and it’s no surprise the Hall effect sensors are out performing the inductive ones. The results of my latest tests are a no brainer, and I have settled on a new Hall effect sensor, which is cheaper, has a longer supplied cable, and terrific performance.

If I used a strong magnet the inductive sensor had great performance at low cranking speeds, such that it would “start” with cranking handle, but when I changed the trigger to a plain ferrous material, the performance of the inductive sensor was obliterated by the Hall effect. It took 165 rpms before the inductive sensor would work, the Hall effect at less than 7 rpm. It was so good, the Hall effect would be triggered by the ferrous material, switch on the ignition module, and make a spark in a seemingly instantaneous action. I initially tried it with an 8mm diameter object, but when it was reduced to less than 5mm, it took nearer 400 rpms to trigger the inductive sensor, yet the Hall effect lost no slow speed performance, so that’s case closed on the sensor.

There was an observation that the square edged on sudden transitional tooth is a problem for the sensor at low speed, it must be a sawtooth or sinusoidal tooth profile to work well.

The only problem was it is now a different size, and so the fit is different in the timing cover, and this had to be modified yet again. Fortunately, the 3D modeller hadn’t started on my covers, so I have revised the drawing definitely for the last time.

This means, the timing cover will be suitable for a toothed wheel approach like before, or a single tooth set up with the Imfsoft unit, and depending on the number of sensors, whether you get wasted or sequential spark.



This is the final version!