Page 50 of Motec Parts Catalog by MoTec

MoTeC Parts Catalogue 2005 Page 50 of 69 Copyright MoTeC Pty Ltd 22/06/2006 Reproduction in whole or in part is prohibited without written approval from MoTeC Pty Ltd Crank, Cam and Speed Sensors These sensors are used for measuring rotational position and speeds, they are most commonly used to measure crankshafts, camshafts, and wheel speeds. The sensors come in two main varieties, Magnetic and hall, they can be distinguished from one another by the number of wires connecting to them, with 2 pin sensors being magnetic, and 3 pin sensors being hall. Hall Sensors. Hall Sensors contain a semiconductor Hall effect IC and a magnet. The IC detects changes in the field strength as the vane passes through the sensor gap or a tooth passes the sensor tip. The output voltage changes from low to high when the leading edge of the tooth passes the centre of the sensor. The vane or tooth material must be magnetically soft (such as mild steel), do not use stainless steel. There are styles of hall sensor available that can be used with a tooth (gear) style chopper wheel for crank angle or wheel speed sensor, or types that use a vaned rotor passing through a hall sensor gap (51121). Magnetic sensors. Magnetic sensors must use shielded wire to help eliminate unwanted electrical noise. The magnetic sensor generates a voltage between the coil wires when the magnetic field strength changes as the tooth passes by the sensors. The sensor may be wired for either a Rising or Falling waveform by reversing the wires. The output voltage amplitude increases with increased RPM. The output voltage amplitude also depends on the gap between the sensor and the tooth. The tooth material must be magnetically soft (such as mild steel), do not use stainless steel. May have a large number of teeth due to the sensors small magnetic pole size, and are often used as crank or wheel speed sensors. The ECU needs to know whether the wave form is rising or falling must be mounted rigidly as any vibration can cause false signals. Refer to drawing number T02 for more details. Ignition Combiner. The MoTeC ignition combiner takes the ignition output from your ECU, and splits its output into two, one output for your ignition system, and another to drive your tachometer. This frees up an Aux output on your ECU, useful for applications where they are limited. Row 1: Hall sensor, GT101 term, GT101 unterminated, GT101 mount, HKZ101, Row 2: HD board, Ignition combiner, right angle mag, straight mag, small mag 57102 7/16 X 20 thread hall wheel speed sensor 57100 GT101 terminated hall sensor (Drawing X02) 57101 GT101 unterminated hall sensor (Drawing X02) 57099 Mount for GT101 hall sensor 51121 HKZ101 hall switch to suit vaned rotor (Drawing T01) 51009 Harley Davidson trigger board and ring to suit 1340 Evo Engine 53110 Ignition combiner with tacho output (Drawing A10) 52001 Right angle Delco magnetic sensor (Drawing X01) 51004 Straight Delco magnetic sensor (Drawing X01) 52002 Small grey magnetic sensor

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