EI Coil

(Difference between revisions)

Revision as of 10:58, 10 January 2012

When using a Datsun Electronic Ignition distributor, you can use the stock 1200 coil as long as you leave the ballast resistor in place. But a high-energy Datsun coil has vastly better performance.

Also see: EI Wiring

Overview

For best performance, use a Pulsar N12 coil or other Datsun-Nissan coil from a high energy system. Or a compatible aftermarket coil. It draws 12.9 amps @ 0.93 ohms. Any 1980s era Datsun-Nissan EI coil should work just fine. With this type of coil, bypass the stock resistor. Remove it or simply jump a wire (short) across both terminals. See EI Wiring for details.

The coil from a Series 2 Bluebird (Datsun 910) or R31 Pintara with electronic dizzy may be used with Datsun/Nissan electronic ignition.

Pulsar Coil aftermarket
Standard Motor Products UC12
Primary 200 Scale .7 - 1.4
Secondary 200 Scale 9.0k - 15.5k

N12 part number 22433-11M00 assembly
22462-11M00 Hitachi coil
22462-N7811 Hanshin coil

Current Draw

Stock points coil is 1.3 ohms + 1.5 ohm resistor = 3.2 ohm, so it will draw 3.75 amps at 12 volts (I=V/R). This low amperage is to prevent the contact points from burning out. Except when starting, it sees a lower voltage because of the Ballast Resistor.

Points coil: 3.75 amps
Nissan IE coil: up to 12 amps (e.g. N12 Pulsar)

The higher current draw allow a fatter spark, even at higher voltages. Exactly what the engine wants.

Bosch

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NOTE: Bosch GT40R or GT40RT can be used as a direct replacement for the stock 1200 coil, but is less powerful than the stocker 1.3 ohm points coil. Ditto for the GT40/GT40T, it's not a high-energy coil even though it does not use a Ballast Resistor (it has a resistor built-in).

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Bosch HEC715 (made in China) is the aftermarket coil for EI systems, and draws more current (0.41 ohms). Consider using an ignition relay as this will draw a peak 29 amps (I=V/R) if you connected it to a points system -- although considerably less in usage with EI as the electronic controller will never stay in the closed circuit for very long like points can do if the engine stops with the points in closed position.

MSD Blaster

MSD Blaster

For multi-channel coil drivers (not stock EI)
Low resistance, quick rise time for high-revving systems
Maximum Output: 43,000 volts
85:1 windings

MSD Blaster 2/MSD Blaster 3

Primary Resistance: 0.7 ohms 
Secondary Resistance: 4.70K ohms 
100:1 windings
Maximum Output: 45,000 volts