8727CT Datasheet, PDF (1/2 Pages) Mallory performance club – Digital Soft-Touch HEI Rev Limiter

Digital Soft-Touch HEI Rev Limiter
PN 8727CT
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Parts Included:
1 - Digital HEI Rev Limiter
1 - Wiring Harness
2 - Mounting Screws and Nuts
WARNING: Before installing the Digital Soft-Touch HEI Rev Limiter, disconnect the battery cables. When
disconnecting the battery cables, always remove the Negative (-) cable first and install it last.
The Digital HEI Rev Limiter is designed to provide an accurate engine rpm limit for racers using a GM based
HEI (internal coil) Distributor. The rev limit is easy to set with two rotary dials in 100 rpm increments with a
range from 3,000 – 9,900 rpm. The advanced digital technology of the Limiter provides a very accurate and
smooth rev limiting action. The Limiter also has a built-in recall feature that will record the peak rpm recorded
and will display that rpm value for five seconds when the ignition is turned on.
MOUNTING
The Digital Rev Limiter is designed to be mounted in the engine compartment or interior though it should be
mounted away from high heat sources. It is recommended to mount the unit within easy view for the crew
and tech inspectors to easily view the LED display for limit confirmation and adjustments.
Position the unit where the LED and adjustment dials are easy to view and access. Make sure the wiring
harness reaches the distributor and mark the location of the mounting holes. Use a 3/16” bit to drill the holes
and mount the unit with the supplied
hardware.
RPM LIMIT AND SETTINGS
The rpm limit is set using the two rotary
dials on the unit with a range of 3,000-
9,900 rpm in 100 rpm increments. The left
dial controls the 1,000s and the right dial
controls the 100s of the desired rpm value
(Figure 1). There are small numbers on
the dials to show the rpm value however
the LED will display the rpm value being
set when the ignition is in the On position
(engine can be running or not)
6 5 0 0.
23
23
GREEN
RED
BLACK
1000s
ADJUSTMENT
100s
ADJUSTMENT
FAULT
INDICATOR
Figure 1 The Digital HEI Rev Limiter.
Maximum RPM Recorded: The PN 8727CT records the maximum rpm value that the engine reached in the
last 20 minutes of power on. When the ignition is turned on, the max rpm will flash on the display for
the first five seconds before reverting to the set rpm limit.
To reset the maximum rpm value, power to the PN 8727CT must remain on for 20 consecutive
minutes.
Faults: The Digital Rev Limiter will record and display an ‘F’ to show a Fault occurred to alert of a wiring or
operation discrpency. The ‘F’ will display on the LED screen for three seconds after the Max RPM is
shown at ignition on. Also, a flashing decimal point to the right of the LED read out to alert when a
Fault has been recorded. An ‘F’ will be recorded when the Green wire is disconnected or opened
with the engine running above 2000 rpm.
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