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MSD DIS-2 Plus Ignition PN 62112 Installation Instructions

October 2nd, 2010 · No Comments

The MSD Digital DIS-2 Plus Ignition can be used on 4-cylinder engines equipped with two dual output coils. The DIS-4 Plus Ignition can be used on 4, 6 or 8-cylinder engines equipped with up to four dual output coils. The Ignitions will accept trigger inputs from electronic distributorless type ignition systems.
NOTE: It is recommended that you have the Service Manual and wiring diagram for your vehicle before beginning the installation of the MSD DIS Ignition.
WARNING: Before installing the Ignition, disconnect the battery cables. When disconnecting the battery cables, always remove the Negative (-) cable first and install it last.
NOTES: 1. Solid Core spark plug wires cannot be used with an MSD DIS Ignition. 2. Vehicles originally equipped with a CD ignition cannot use an MSD DIS Ignition.
THEORY OF OPERATION
CAPACITIVE DISCHARGE
The MSD Digital DIS Series Ignitions feature a capacitive discharge ignition design. The majority of stock ignitions 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 which results in a loss of power or top end miss. The MSD Ignition features a capacitor which is quickly charged to 460-480 volts and stores it until the ignition is triggered. With the CD design, the voltage sent to the coil is always at full power even at high rpm.
MULTIPLE SPARKS
The MSD Digital DIS Series Ignition produces full power multiple sparks for each firing of the spark plug. The number of sparks that occur decreases as rpm increases, however the spark series always lasts for 20° of crankshaft rotation. Above 3,000 rpm there is simply not enough time to fire the spark plug more than once, so there is only one powerful spark.
REV LIMITER
The MSD DIS-2 and DIS-4 Ignitions are equipped with a built-in adjustable Soft Touch Rev Control. This rev limit feature can be adjusted in 100 rpm increments using the program switches on the ignition’s end panel. The Soft Touch circuitry provides a smooth and accurate rev limit by dropping the spark to individual cylinders. The Soft Touch produces a load-free rev limit that is accurate to within 10 rpm of the selected rpm.

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