rotorwrench
Well-known member
The math looks close enough for me per Ohms law.
For Ranchero50
The resistor wires were used by all the big 3 and probably others too. The heat was dissipated over the length of the resistor wire so it wasn't all in one spot. I'm not sure what the coil specs were for those systems either. The mounted ballast is usually 1.3 to 1.5 Ohms and are easy to work with for a 1.5 Ohm coil. I prefer to use the components I know for building a system from scratch. On a GM engine, I'd use an HEI type system with 12-volt. On a Ford engine, I'd use what ever came with that engine unless it has an old Load-O-Matic. Those systems were tied to the carburetor and don't work well without the original carb. The type of vacuum advance signal also has to be considered. Many conventional breaker types can be changed to electronic systems if a person doesn't want points & condenser.
A person always has to keep in mind that a 6-volt system runs at around 7.1 to 7.6-volts in operation. The 12-volt systems are closer to 14-volts in operation with the generator or alternator on line.
For Ranchero50
The resistor wires were used by all the big 3 and probably others too. The heat was dissipated over the length of the resistor wire so it wasn't all in one spot. I'm not sure what the coil specs were for those systems either. The mounted ballast is usually 1.3 to 1.5 Ohms and are easy to work with for a 1.5 Ohm coil. I prefer to use the components I know for building a system from scratch. On a GM engine, I'd use an HEI type system with 12-volt. On a Ford engine, I'd use what ever came with that engine unless it has an old Load-O-Matic. Those systems were tied to the carburetor and don't work well without the original carb. The type of vacuum advance signal also has to be considered. Many conventional breaker types can be changed to electronic systems if a person doesn't want points & condenser.
A person always has to keep in mind that a 6-volt system runs at around 7.1 to 7.6-volts in operation. The 12-volt systems are closer to 14-volts in operation with the generator or alternator on line.
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