Mallory Ignition Mallory HYFIRE VI Series Electronic Ignition Controls 685_6851 - Manual (Page 13)

X100 X1000 6 4
CYL
PART No. 6851
RPM
MICROPROCESSOR CONTROLLED CD IGNITION SYSTEM
R R ®
HYFIRE ® 6851 IGNITION SYSTEM
The Mallory HYFIRE ® 6851 ignition system has the same basic connections as the 685
ignition system. However, the only accessory included is an RPM activated switch. This
RPM switch is controlled by two rotary DIP switches that are located behind an access plate
on the top of the unit (see the illustration below). Loosen the two screws to gain access to
the switches.
You can select 4 or 6 cylinder operation, and an RPM switch value from 1000 to 9900 RPM.
Use a small screwdriver or similar to select 4 or 6 cylinder mode, if desired. If both these
switches are off, the unit is in 8 cylinder mode. Use a screwdriver to set the 1000 RPM and
100 RPM switches to the desired setting. When you reach this RPM, the violet wire coming
out of the end panel will be connected to ground (10 amp maximum).
OPTIONAL IGNITION ACCESSORIES
Multi Stage High Speed Retard – Part No. 618-3
This is a fi nger tip adjustable 3-stage timing retard control with an adjustment range for
the first and second stage of 0°-15° and a range of 0°- 20° for the third stage. Each
succeeding stage overrides the previous stage to allow you to reduce (or add) ignition timing
on a succeeding stage. This retard is designed to be easily added to the HYFIRE
® VI
Electronic Ignition Control.
Mallory Electronic Advance Computer – Part Nos. 600-04, 600-06 and 600-08
This is a user programmable advance curve system using a CMOS microprocessor for
advance calculations. This allows you to select from 256 different advance curve
combinations! It is designed with matching mating plugs so it can to be added between the
HYFIRE
® VI Electronic Ignition Control and the Ignition Control Harness.
Mallory Remote Timing Control – Part No. 631
Mallory’s Remote Timing Control allows you to change the ignition timing as you drive for
maximum performance, for better fuel economy or to avoid engine knock.
NOTE: The accessories listed above will not work properly with odd-fi re V6
applications or point trigger distributors. They are not designed for marine use.
Mallory Fuel Injection and Tachometer Adapter – Part No. 29074 and 29078
Some applications with fuel injection or a tachometer need a voltage spike signal from the
negative side of the coil before they will operate properly. This signal changes once the
HYFIRE
® VI Electronic Ignition Control is installed. Mallory’s adapter provides the proper signal
to trigger most fuel injection systems and voltage/current triggered tachometers.
FIGURE 21
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