HEI vs MSD comparison
Doesnt happen.. Unless you check out MSD , Accel's adjustable 4 pin HEI modules(100 -125 U.S. Dollars ,IIRC..).
I believe someone else is marketing an HEI module with rev limiter.
The OP does not seem to understand?? that MSD is completely different. There are two general (well there is more) types of ignition on these girls
1...A form of Kettering.........derives from breaker points.......this is where power is supplied to the coil from the battery, and the points / electronic box switches the ground side of the coil on and off. Regardless of performance level, this type includes (by memory)
breaker points.........Mopar breakerless, Ford breakerless, GM HEI, Pertronix, Skip White and MSD 'ready to run' setups which hook in with no "box." There are other brands
2.....Some type of high energy discharge, IE CDI (Capacitive Discharge Ignition) of which MSD is one. MSD is "Multiple Spark Discharge). CDI works like an electronic camera photoflash, when triggered, it discharges a large charged capacitor into the coil, a "pulse." MSD does this multiple times at some RPM
BALLAST...........Not all switched/ Kettering systems need a ballast. Tractors, generaly are an example.........the coil operates direct off the battery, they were designed for this.
"My take" on why US car makers universally used a ballast is COLD WEATHER starting.......because during cranking, the ballast gets bypassed, and this generates a stronger spark during cranking.
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OP.......you need to ask yourself, "what are" my ultimate HP goals? Example, my mild 360, later 318 Dart didn't need anything like MSD. I used a GM 4 pin module, triggered by the Mopar dist. firing a factory Mopar coil with no ballast. This combination STILL makes stronger spark than the factory ECU did
