685 datasheet(2/12 Pages) MALLORY

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GENERAL INFORMATION

The HYFIRE® VI Ignition System Part Nos. 685 and 6851 are not for marine use.

The RPM limiter in the HYFIRE® VI 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® VI 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 stan-

dard 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® VI Electronic Ignition Controls are designed to work with most original equipment

ignition coils. For optimum performance use the Mallory 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® VI 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® VI Electronic Ignition Control and un-

plug 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® VI Electronic Ignition Controls.

Mallory PRO TACH® I, IV and VI

The RPM needle and shift light will work with the HYFIRE® VI. However, the tach’s proportional

controller that limits RPM WILL NOT function with the HYFIRE® VI. Turn the LIMIT RPM knob

slightly past 11,000 to prevent the limiter from interfering with the tach’s other functions. See

Optional Ignition Accessories for more information.

MOUNTING PROCEDURE

Step 1

Disconnect the battery (–) cable to cut power to the system. Computerized vehicles: Discon-

nect 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® VI 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. Moisture will damage components inside the unit.

Step 3

Choose one mounting method listed below for mounting the HYFIRE® VI 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® VI 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® VI 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.

FIGURE 1

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