GENERAL INFORMATION

The HYFIRE®6.6 Ignition System Part Nos. 686M are

not for marine use.

The RPM limiters in the HYFIRE® 6.6 is not recommended

as an engine speed governor. The use of the RPM limiters

is not recommended for applications equipped with a

catalytic converter. Similarly, forcing engine RPM past the

RPM limiter continuously for long sustained intervals can

cause fuel build up in the exhaust system that may

adversely affect your application. The RPM limiting systems

will not work properly with odd-fire V6 applications.

Ignition Ballast Resistor / Loom Resistance Wire

The performance of the HYFIRE® 6.6 is not affected by

the presence of the factory ignition resistors or ignition

ballast resistors in the wire from the ignition switch.

Standard Ignition Bypass (Bypass Connector)

The Bypass Connector (supplied) fits into the Ignition

Control Harness to convert back to standard ignition. If

you use the Bypass Connector, use ignition ballast

resistors designed for your vehicle’s distributor and coil

(see diagrams for more information). This bypass method

does not work with magnetic pickup distributor or crank

trigger ignition. Racing Applications: It is not necessary to

install ignition ballast resistors. However, do not use the

Bypass Connector until the ignition ballast resistors are

installed in the wire from the ignition switch.

Ignition Coils

The HYFIRE® 6.6 Electronic Ignition Controls are designed

to work with most original equipment ignition coils. For

optimum performance use the Mallory PROMASTER E Coil

Part Number 30440 (Up to 7,500 RPM), Part No. 30625 (Up

to 10,000 RPM), PROMASTER® Coil Part No. 29440 (up to

7,500 RPM) or Part No. 29625 (up to 10,000 RPM).

Fuel Injection

Some fuel injection systems need a voltage spike signal

from the ignition coil before they will operate properly.

This signal changes once HYFIRE® 6.6 Electronic Ignition

Controls are installed. The Mallory Fuel Injection and

Tachometer Adapters Part Nos. 29074 and 29078 supply

the proper signal to the vehicle computer to operate the

fuel injection system. Installation procedure and diagrams

are supplied with these adapters.

Spark Plug Wires

YOU MUST USE suppression type (carbon core, spiral

core, suppression core) spark plug wire. We recommend

spiral core ignition wire, such as Mallory PRO

SIDEWINDER® Ignition Wire. Suppression type spark plug

wires prevent false triggering and possible premature

ignition or accessory failures. DO NOT USE solid core (copper

core; stainless steel core) spark plug wire with any electronic

ignition system or accessory.

Spark Plug Gaps

For street applications, use your engine manufacturer’s

specifications. For racing applications, start with your

engine manufacturer’s specifications, then experiment

with, and closely monitor, various gaps to achieve

maximum performance.

Electric Welding

Unplug the Ignition Control Harness from the HYFIRE® 6.6

Electronic Ignition Control and unplug any distributor

harnesses (if possible) before any welding is done on the

vehicle.

External RPM Limiters

Mallory Proportional RPM Limiter Part Nos. 641-4, 641-6,

641-8, 642, 643 and 644 WILL NOT function with the

HYFIRE® 6.6 Electronic Ignition Controls.

MOUNTING PROCEDURE

Step 1

Disconnect the battery (–) cable to cut power to the system.

Computerized vehicles: Disconnect the battery (–) cable

and let the vehicle sit overnight before proceeding. This

allows the computer to calibrate for the new ignition.

Step 2

Select a convenient location to mount the HYFIRE® 6.6

Electronic Ignition Control. Keep the unit away from hot

engine components or extreme heat such as the exhaust

system and manifolds. Also, keep it away from moving

devices, such as fans, belts and linkages. The location

must be dry. Excessive moisture will damage components

inside the unit. Chose a location that will allow easy

access to the control port for adjusting the various

functions of the ignition.

Step 3

Choose one mounting method listed below for mounting

the HYFIRE® 6.6 Electronic Ignition Control (3a, 3b, or 3c).

(3a) Mounting to a flat surface

• Center punch the mounting pattern on the mounting

surface using the housing holes to mark locations for

drilling mounting holes. Drill holes using a 7/32” drill bit.

• Hold the HYFIRE® 6.6 Electronic Ignition Control in

position over the mounting holes.

• From the backside of the mounting surface, insert the

10-32 screws with lock washers through the mounting

holes and attach with the 10-32 nuts supplied.

(3c) Mounting to a flat surface with shock mounts (available

separately, PN 29069)

• Center punch the mounting pattern on the mounting

surface using the housing holes to mark locations for

drilling mounting holes. Drill holes using a 7/32” drill bit.

• Install the shock mounts into the side flanges of the

HYFIRE® 6.6 and tighten nuts. Hold the unit in position

where it will be mounted.

• From the backside of the mounting surface, insert the

10-32 nuts with lock washers onto the shock mount

studs. Tighten each nut until snug. When running shock

mounts, it is necessary to run a ground wire (10-14 gauge)

from the ignition housing to a chassis ground.

FIGURE 1

2

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