Technical information

AUTOTRONIC CONTROLS CORPORATION • 1490 HENRY BRENNAN, EL PASO, TEXAS 79936 • [phone] • FAX [phone]
www.msdignition.com email: [e-mail]
71
MSD STACKER IGNITION CONTROLS
Operating Voltage:
Current Requirements:
RPM Range:
Spark Series Duration:
Primary Voltage:
Energy Output:
10-18 Volts,
1 Amp per 1,000 rpm
15,000 RPM with 14 Volt Input
20°
250 Volts
120 millijoules
These are the Red and Black wires (14 gauge) and are responsible for getting direct
battery voltage to the ignition. The ignition has an internal fuse so no fuse is necessary.
This wire connects to the battery positive (+) terminal.
This wire connects to ground, either at the battery negative (-) terminal or to the
engine.
This wire turns the Stacker On and needs to be connected to a switched 12 volt
source. A coil positive (+) wire is a wire that can be spliced into.
The Orange wire(s) on the MSD Stackers, one on the Stacker, four on the Stacker-4,
eight on the Stacker-8, are the trigger wires and need to be connected to each coil’s
negative wire. Use the supplied ring lug or Blue tab splice connectors to connect the
Orange wires to their connection (Figure 1).
Note: If your application does not use all of the Orange wires (the channels), the
remaining Orange wires should be connected to an active channel.
Power Leads
Black(14 Gauge)
Orange Wires
(18 Gauge)
Trigger/Output
Red(18 Gauge)
Red(14 Gauge)
Specifications:
The Stacker Advantage
The MSD Stacker Ignitions utilize the best characteristics of both the conventional factory inductive ignition and a
multiple sparking, capacitive discharge (CD) ignition system. The inductive side of the ignition provides the engine
with a long duration spark while the Stackers CD design provides a full power spark with high voltage and energy.
The Patented design of the Stacker Ignitions allow the system to run parallel with the stock ignition resulting in
simplified installation and compatibility with the rest of the vehicle’s electronics.
Capacitive Discharge: The MSD Stacker Ignitions feature a capacitive discharge ignition design.
The majority of factory ignition systems are inductive ignitions. In an inductive ignition, the coil must store and step
up the voltage to maximum strength in between each firing. At higher rpm, since there is less time to charge the coil
to full capacity, the voltage falls short of reaching maximum energy resulting in a loss of power or top end miss.
The MSD Stacker Ignitions feature a step up transformer and capacitor which is quickly charged to full power (120
millijoules) in less than one millisecond. This produces a full power spark throughout the entire rpm range of the engine.
Multiple Sparks: Due to the quick charge time of the Stacker’s CD design, they are capable of
delivering a series of full power sparks to each spark plug. Under 3,000 rpm, the Stackers deliver a series of sparks
that lasts for 20° of crankshaft rotation for each firing of the spark plug. The number of sparks that occur depends on
rpm. Above 3,000 rpm there is simply not enough time to fire the spark plug more than once, but there is always
one full power spark.
The high output and multiple sparks of the Stacker Ignitions work together with the stock inductive spark to ensure
complete combustion of the fuel mixture. Improved combustion results in quick starts, smooth idle, quick throttle
response and increased performance.
Stacker Ignition, Single Channel, PN 7000
For 4, 6 or 8-cylinder engines with a distributor,
points or electronic.
Stacker-4 Ignition, PN 7010
Designed to work with four channel DIS vehicles.
Stacker-8 Ignition, PN 7020
Designed for engines with individual coils per
cylinder. Up to eight cylinders.