PN4224 Datasheet, PDF (1/24 Pages) Mallory performance club – Programmable MC-4 Ignition Control

Programmable MC-4 Ignition Control
PN 4224
  Parts Included:
1 - MC-4
4 - Mounting Screws
7 - Wire Ties
5 - Wire Caps
1 - Pro-Data+ CD
2 - 3 Amp Fuses
1 - Wire Harness
1 - Diode
5 - Ring Terminals
10 - Butt Splices
5 - Male Fastons
5 - Female Fastons
4 - Female Deutsch Terminals
2 - Diodes
1 - 4" Heat Shrink
WARNING: During installation, disconnect the battery cables. When disconnecting the battery always
remove the Negative cable first and install it last.
Note: Solid Core spark plug wires cannot be used with the MC-4 Ignition. We recommend only the MSD 8.5mm
Super Conductor Wires. A 4-Cylinder Universal Kit is available as PN 31449.
OPERATION
DIGITAL OPERATION
The Programmable MC-4 uses a high speed RISC microcontroller to control the ignition’s output while constantly
analyzing the various inputs such as supply voltage, trigger signals and rpm. The high speed controller can make
extremely quick compensations to the timing and rpm limits while maintaining accurate timing signals to within +/-
0.1° and +/- 10 rpm. The circuits and controller of the MC-4 have been thoroughly debounced and suppressed to
create protection against Electro Magnetic Interference (EMI).
Note: The MC-4 can be removed from power and still retain its programmed settings.
CAPACITIVE DISCHARGE
The MC-4 features a capacitive discharge ignition design. The majority of stock and aftermarket ignition systems are
inductive ignitions. In an inductive ignition, the coil must store energy and step up the supplied voltage to maximum
strength between each firing. At higher rpm, since there is less time to charge the coil to full capacity, the secondary
voltage falls short of reaching its maximum energy level which results in a loss of power or a top end miss.
The MC-4 Ignition features a capacitor which is quickly charged to 490 - 505 volts and stores this energy until the ignition
is triggered. With the CD design, the voltage sent to the coil is always at maximum power even at high rpm.
MULTIPLE SPARKS
The MC-4 produces full power multiple sparks for each firing of a plug. The number of multiple sparks that occur
decreases as rpm increases, however the spark series always lasts for 20° of crankshaft rotation. Above 3,300 rpm
there is simply not enough time to fire the spark plug more than once, so there is only one full power spark.
PROTECTION
The Programmable MC-4 has a built in reverse polarity protection circuit. This will protect the ignition in the event
of wrong connections. It will also shut off for protection from a surge in power. The ignition will still operate once the
surge or polarity is corrected.
LED INDICATOR
There is an LED that monitors the status of the Ignition. The LED will verify trigger inputs and will flash trouble codes
such as a Code 2 for No Cam Sync or Code 3 for Low Battery supply voltage.
SHIFT COUNTING
The MC-4 uses state of the art computer circuitry to determine when a shift has occurred. This eliminates having
to wire in separate external switches. The MC-4 will sense the normal rpm drop of the engine to determine that
a shift has been made. The rpm drop is programmable so it can be matched to the specific engine combination
being used. In addition the engine rpm has to increase by 200 rpm before the next gear can be selected to prevent
double shifting.
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