PN6427 Datasheet, PDF (6/12 Pages) Mallory performance club – MSD Circle Track Ignition

6
INSTALLATION INSTRUCTIONS
REV LIMITER
The Digital 6CT features a built-in Soft Touch Rev Control that can be set from 2,000 to 11,900 RPM.
It provides smooth and accurate rev limiting by dropping spark to individual cylinders. The Soft
Touch produces a load-free rev limit that varies less than 5% from the selected RPM.The RPM limit
is adjusted in 1000 and100 RPM increments with the sealed rotary switches marked RPM x 1000,
and RPM x 100. For example: to set a rev limit of 7,500 RPM the dial marked RPM x 1000 would
be set to number 7, and the dial marked RPM x 100 would be set to 5. Once set the LED display will
read 7500.
For a rev limiter in the 10,000 range, set the dials as they would be for any other RPM but the left
dial will use '0'. To set the rev limiter to 11,000 RPM, put the left dial to '1' and the right dial to '0'.
Note: The engine can be running as you make adjustments to the rev limiter function.
CYLINDER SELECT
The 6CT is programmed at the factory for use on 8-cylinder engines. If you are installing on a 4 or 6
cylinder engine, you will have to program the ignition. This is easily achieved through the rotary switch
marked Mode. Below is a chart that indicates the programming position of the rotary switch. The
Mode switch will also set a start retard, display a live tach or display battery voltage.
MODE SWITCH SELECTION CHART
Mode
Switch
Position
Order of Display and Function
Max Engine RPM / Number of Cylinders Selected / Start Retard Selected / Rev Limit
0
*Live Tachometer / For testing only
1
Max Engine RPM / 8 Cyl, 0° Start Retard / Rev Limit Set
2
Max Engine RPM / 8 Cyl, 10° Start Retard / Rev Limit Set
3
Max Engine RPM / 8 Cyl, 20° Start Retard / Rev Limit Set
4
Max Engine RPM / 6 Cyl, 0° Start Retard / Rev Limit Set
5
Max Engine RPM / 6 Cyl, 10° Start Retard / Rev Limit Set
6
Max Engine RPM / 6 Cyl, 20° Start Retard / Rev Limit Set
7
Max Engine RPM / 4 Cyl, 0° Start Retard / Rev Limit Set
8
Max Engine RPM / 4 Cyl, 10° Start Retard / Rev Limit Set
9
*Battery Voltage / For testing only
*When the Mode switch is set to 0 or 9, the unit defaults to 8 cylinder, 0° start retard operation.
Position 0 and 9 are designed as tools. When the switch is set to 0 the LED display reads the
current RPM of the engine as a live tach. Position 9 on the Mode switch will display the battery
supply voltage to the ignition.
When the Mode switch is set to positions 1-8, the unit will be set to the corresponding setting
in the above Mode Switch Selection Chart.
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