Mallory Unilite Distributor #3772101

[Phil Gillespie]

Originally Posted by BUBBAS IGNITION

Based on quality and availablility it changes somedays.
Heres the deal on a flathead (low rpm band and low compression) the 12 volt ignition needs a primary current of approx 3-4 amps. A napa IC12SB (1.5 ohms) and a 1.5 ohm resistor would be 3 ohms divided into 12 volts for a current flow of 4 amps. This set up has worked great forever.
Now to step it up just a bit I have been using a German made coil the Beru ZS172 blue at 3.3 ohms and no resistor for a current flow of 3.63 amps , i have shipped over 100 of these and they seem to work very well ! I still like the Bosch Blue # 00012 coil at 3ohms as well, just because it is shipped with a nice mounting bracket..
The main thing is to have a current flow of approx 3-4 amps in the primary.

Now if we are discussing a 12 -13 to 1 compression at 8,000 rpm , thats a different story !! But we just dont need it with the flatheads......

The 3 to 4 amps in the primary side, does this also apply to 6v original coil with resistor?
Phil NZ