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Under the Boot: ETCO Research Takes a Look at Coil on Plug Connections

Publisher: ETCO
Focusing on the connection between the coil and the spark plug used in the coil on plug assemblies, this paper compares and evaluates an assortment of industry standard coil to plug connections. It applies various tests and measurements, which expose each connecting device to the same conditions, providing an, "apples to apples" comparison and use these studies to gage the connection devices performance and develop ideas for improvement. Figures illustrating distributor cap with terminal towers, electronic ignition coil pack, voltage drop fixture, 13.8 VDC regulated power supply, control box circuitry, complete voltage measurement set-up, and 2 channel 50 MHz oscilloscope are also included. The paper recommends that under these conditions, a connecting device should be retained by a physical coupling offering resistance to movement at the point of connection.
2.The Issue2
3.The Ignition System3
4.Measurements and Testing6
4.1.Resistance Measurements6
4.2.Voltage Drop Measurements8
4.3.Retention Force Measurements12
4.4.Vibration Effects on Devices13
4.5.Visual Evaluation of Sparking Events14
8.1.Distributor with Points3
8.2.Distributor Cap with Terminal Towers3
8.3.Electronic Ignition Coil Pack3
8.4.90 Terminal4
8.5.Straight Terminal4
8.6.Chatillon Gauges and Motion Control Equipment Used to Measure Retention Values4
8.7.Chatillon Gauges and Motion Control Equipment Used to Measure Retention Values4
8.8.COP Assembly5
8.9.COP Assembly5
8.10.Coil on Plug Connector Devices5
8.11.Figure 115
8.12.Figure 125
8.13.Figure 135
8.14.Figure 145
8.15.Figure 156
8.16.Figure 166
8.17.Figure 176
8.18.Voltage Drop Fixture7 VDC Regulated Power Supply7
8.20.Control Box Circuitry7
8.21.Control Box7
8.22.Complete Voltage Measurement Set-up7
8.23.2 Channel 50mHZ Oscilloscope7
8.24.Figure 2411
8.25.Figure 2512
8.26.Figure 2612
8.27.Figure 2712
8.28.Figure 2813
8.29.Figure 2913
8.30.Figure 3013
8.31.Figure 3113
8.32.Figure 3213
8.33.Figure 3313
8.34.Figure 3413
8.35.Figure 3514
8.36.Figure 3614
8.37.Figure 3714
8.38.Figure 3816
8.39.Figure 3916
8.40.Figure 4016
8.41.Figure 4116
8.42.Figure 4216
8.43.Figure 4316
9.1.Resistance Measurements6
10.1.Connecting Device Measurements15
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