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When
No.1 Cylinder is at TDC, the Sensor must be placed 90 degrees before the
centre of the gap. You can place the sensor in the most suitable position
for ease of mounting within the 360 circle provided the above rule is
adhered to. The sensor we use (part number CRK-SEN5) this has a 3mm diameter
magnetic pick up (inductive type 2 wire). The diameter of your wheel if
you are producing your own, is controlled by the size of the magnetic
pick up. The gap between each tooth, must not be less than the diameter
(or width) of the magnetic pick up itself. Otherwise the sensor will not
be able to detect a gap, it will just see the teeth on either side. The
number of teeth on the wheel is 36 with 1 tooth removed (35 teeth with
one big gap). It is recommended that you have a maximum gap between sensor
and the timing wheel be of 1mm. The gap between the sensor and the timing
wheel, may need to be reduced according to the diameter of the wheel you
are using. If you are struggling with space and require to make the size
of the wheel very small, it is recommended that you begin to reduce the
width of the teeth in order to maintain the minimum gap between teeth,
so the sensor can still detect the gap. Obviously, as the teeth get smaller,
the sensor will struggle to detect the signal being generated by the tooth.
This is the reason for reducing the gap between the sensor and the timing
wheel.
It
is recommended that the depth of the cut out between each tooth is as
deep as possible. The reason for this is the deeper the gap the harder
it will be for the sensor to detect anything other than the tooth. This
is particularly important that if your engine or equipment fitted to the
engine produces interference, this will help to reduce the problem of
signal degradation.
You
must remember that if your toothed wheel or sensor does not produce a
clean signal for the ECU , at the very least the engine may not start
and unfortunately even worse, if the sensor signal is poor or weak, it
may create a random misfire. This could then be virtually impossible to
detect its cause and it could take days to find the cause.
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