Below is a partial quote from a Camaro website regarding TI Ignition ststems:
"The TI coil differs in that the negative terminal is grounded directly to either (depending on the year and type of wiring harness) the firewall or the engine. In contrast, the standard ignition coil connects the negative terminal to the distributor wire and the electrical path passes through the points before going to ground. The TI coil receives 2.5-4.5 volts with the ignition switch turned on while the engine is off; in contrast, the standard coil operates at about 9 volts. Both coils receive 12 volts from the starter solenoid during starting.
Note that because the TI system creates the spark on the positive side of the coil (opposite from a points system, which generates the spark on the negative side), on an engine analyzer the graph or curve generated by TI has the opposite sign from that produced on a points ignition.
As mentioned, these Transistor Ignition coils have a lower impedance across the primary terminals. Standard coils measure 1.24- 1.46 Ohms. The TI coil measures 0.41-0.51 Ohms and most can be identified by a three-digit raised number, either 207 or 210, on the side of the case."
I have a Pertronix System in my non TI 66 427/390. Based on the above, would that mean that an engine analyser graph/curve would be read differently now.... versus how it would be read if I was using the original points system? Thanks for the help and education....
Rick.
"The TI coil differs in that the negative terminal is grounded directly to either (depending on the year and type of wiring harness) the firewall or the engine. In contrast, the standard ignition coil connects the negative terminal to the distributor wire and the electrical path passes through the points before going to ground. The TI coil receives 2.5-4.5 volts with the ignition switch turned on while the engine is off; in contrast, the standard coil operates at about 9 volts. Both coils receive 12 volts from the starter solenoid during starting.
Note that because the TI system creates the spark on the positive side of the coil (opposite from a points system, which generates the spark on the negative side), on an engine analyzer the graph or curve generated by TI has the opposite sign from that produced on a points ignition.
As mentioned, these Transistor Ignition coils have a lower impedance across the primary terminals. Standard coils measure 1.24- 1.46 Ohms. The TI coil measures 0.41-0.51 Ohms and most can be identified by a three-digit raised number, either 207 or 210, on the side of the case."
I have a Pertronix System in my non TI 66 427/390. Based on the above, would that mean that an engine analyser graph/curve would be read differently now.... versus how it would be read if I was using the original points system? Thanks for the help and education....
Rick.
.
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