INSTALLATION INSTRUCTIONS

5

PROGRAMMING

CYLINDER SELECT

The MSD is programmed for operation on 8-cylinder engines.

If installing the Ignition on a different style engine, the number

of cylinders will need to be selected on the Cylinder Select

Rotary Switch (Figure 1).

REV LIMITER

There are two adjustable rev limits that you can adjust; the

Max Limit and the Two Step Limit. Both limits are adjusted in

100 rpm increments by turning the rotary switches on the side

of the Ignition (Figure 2).

Note: The engine can be running as

you make adjustments to the rev limiter function.

Max Limit: This is the overrev rpm limit. The Soft Touch circuitry will begin dropping the spark to

cylinders any time the rpm reaches the amount you select, except if the Two Step Limit is activated (12

volts applied to the Blue wire). The limit can be adjusted from 2,000 to 11,900 rpm. Setting both dials

to Zero defaults to a limit of 10,000 rpm. Setting the 1,000's dial to 1 defaults to 11,000 rpm rev limit.

Figure 2 Adjusting the Rev Limits.

Grounds: A poor ground connection can cause many frustrating problems. When a wire is specified

to go to ground, it should be connected to the battery negative terminal, engine block or chassis.

There should always be a ground strap between the engine and the chassis. Always securely connect

the ground wire to a clean, paint free metal surface.

Ballast Resistor: If your vehicle has a ballast resistor in-line with the coil wiring, it is recommended

to bypass it.

Routing Wires: The MSD wires should be routed away from direct heat sources such as exhaust

manifolds and headers and any sharp edges. The trigger wires should be routed separate from the

other wires and spark plug wires. It is best if they are routed along a ground plane such as the block

or firewall which creates an electrical shield. The magnetic pickup wires should always be routed

separately and should be twisted together to help reduce extraneous interference.

Figure 1 Programming the Number of

Cylinders.

6

4

8

CYL

6

4

8

CYL

THIS EXAMPLE

SHOWS 8-CYLIN-

DER ENGINE (FULL

CLOCKWISE).

THIS EXAMPLE

SHOWS THE

OVERREV AT

6,500.

THIS EXAMPLE

SHOWS 2,500

RPM.

CYLINDER

COUNT

Figure 2 Rev Limiter sample setting.