J.P. Instruments EDM-700 Manual

Pilot’s Guide
Engine Data Management
EDM-700
EDM-800
Copyright 2001 J.P. Instruments, Inc.
All Rights Reserved
J.P. INSTRUMENTS INC.
Information: P. O. Box 7033
Huntington Beach, CA 92646
Factory: 3185 B Airway
Costa Mesa, CA 92626
[phone] Fax [phone]
www.jpinstruments.com
Printed in the United States of America Rev P 05/2001

Table of Contents
SECTION 1 - .............................................................INTRODUCTION
5
PRODUCT FEATURES ..........................................................................5
ENGINE DATA MANAGEMENT...............................................................5
BENEFITS OF PROPER MIXTURE CONTROL...............................................2
JPI PROBES ......................................................................................2
TEMPERATURE AND MIXTURE ..............................................................2
SECTION 2 - ............................................DISPLAYS AND CONTROLS
4
DISPLAYS.........................................................................................4
MODES ............................................................................................7
BUTTONS .........................................................................................8
PARAMETER SCAN—SYSTEMS WITHOUT FUEL FLOW OPTION .................. 10
SECTION 3 - ............................................OPERATING PROCEDURES
11
DIAGNOSTIC TESTING ON STARTUP AND DURING FLIGHT ......................... 11
MODES .......................................................................................... 11
AUTOMATIC MODE........................................................................... 11
MANUAL MODE............................................................................... 12
LEANFIND MODE—LEANING RICH OF PEAK.......................................... 12
LEANFIND PROCEDURE—GENERAL EXPLANATION................................. 15
OPERATION FOR EACH PHASE OF FLIGHT .............................................. 20
SHOCK COOLING ............................................................................. 21
COMMON MISAPPLICATIONS.............................................................. 22
SECTION 4 - ................................DIAGNOSING ENGINE PROBLEMS
23
ALARMS ........................................................................................ 27
PRE-IGNITION AND DETONATION ........................................................ 28
SECTION 5 - .............................................................DATA LOGGING
29
SECTION 6 - .................................FUEL FLOW OPTION OPERATION
30
FUEL FLOW DISPLAY SELECT SWITCH ................................................. 30
FUEL MANAGEMENT ........................................................................ 32
PARAMETER SCAN—SYSTEMS WITH FUEL FLOW OPTION........................ 32

For Your Safe Flight Page 3
PARAMETER START UP SEQUENCE WITH FUEL FLOW OPTION................... 33
SECTION 7 - ........................................LONG TERM DATA MEMORY
35
SECTION 8 - ............................................................PERSONALIZING
39
PILOT PROGRAMMING....................................................................... 39
SECTION 9 -PROGRAMMING THE EDM-800 HORSEPOWER
CONSTANT ..................................................................................... 41
SECTION 10 - PROGRAMMING MANIFOLD PRESSURE (MAP) ...... 42
SECTION 11 - PROGRAMMING USE OF FACTORY ORIGINAL TIT
PROBE 43
SECTION 12 - PROGRAMMING THE FUEL FLOW OPTION ............ 44
FUEL FLOW OPTION PROGRAMMING PROCEDURE................................... 45
SECTION 13 - PROGRAMMING LONG TERM DATA MEMORY ...... 46
SECTION 14 - ALARM LIMITS ........................................................ 48
MAP, FUEL FLOW ALARM LIMITS, UNITS, FUEL CAPACITY ..................... 51
SECTION 15 - REAL-TIME SERIAL DATA PORT............................. 52
NAVIGATION DATA FORMATS............................................................. 54
SETTING GPS-C FUEL FLOW COMMUNICATIONS FORMAT ....................... 54
DIAGNOSTIC MESSAGES, FUEL FLOW .................................................. 55
NAVIGATION DATA PORTS FOR GPS COMM .......................................... 55
SECTION 16 - OPTION CONNECTOR PIN ASSIGNMENTS .............. 56
SECTION 17 - REFERENCE READING ............................................ 57
SECTION 18 - TECHNICAL SUPPORT ............................................. 57
LIMITED WARRANTY.................................................................... 58
INDEX............................................................................................. 59

How to Change Modes (page 7)
EDM-700 enters Automatic mode two minutes after power up

For Your Safe Flight Page 5
Section 1 -Introduction
Product Features
EDM 700/800 Standard Instrument:
•Hands-free, automatic scanning
•All programming done from the
Front Panel
•LeanFindfinds the first and last
cylinder to peak with true peak
detect—eliminating a false peak
detection. Displays both leaned
temperature below peak and peak
•Battery voltage with alarm
•24 Programmable alarm limits
•Normalize view
•DIF low to high EGT with alarm
•RS-232 Output for data logging in
real time
•Oil temperature option
•EGTs to stable 1°F resolution
•Shock cooling monitored on every
cylinder
•User selectable index rate
•Fast response probes
Fuel Flow Option:
•Solid-state pulse generating rotor
fuel flow transducer
•Fuel quantity measured in gallons,
kilograms, liters, or pounds
•Low fuel quantity alarm
•Low fuel time alarm
•GPS interface
•Instantaneous fuel flow rate
•Total amount of fuel consumed
•Total fuel remaining
•Time to empty at the current fuel
flow rate
Long Term Data Memory:
•Records and stores data up to 30
hours
•Non-volatile memory
•Post-flight data retrieval
•Download to Palm™ Computer
•Data retrieval software
EDM-800 %HP, MAP and RPM:
•Displays % horsepower and RPM
•Automatically calculates percent
horsepower
Engine Data Management
The EDM Engine Data Management system is the most advanced and
accurate piston engine-monitoring instrument on the market. Using the
latest microprocessor technology, the EDM will monitor up to twenty-
four critical parameters in your engine, four times a second, with a
linearized thermocouple accuracy of better than 0.1 percent or 2 F°.
As your built-in flight engineer, the EDM is constantly “red line”
checking: all critical parameters are automatically checked four times a
second, regardless of the current display status. Leaning is accomplished
quickly and automatically using the LeanFindprocedure. With the

Page 2 Engine Data Management
EDM it is now possible to have substantially more diagnostic
information available to you in a timely and usable manner.
The real-time serial data port—a standard feature—permits you to record
scanned parameters in real-time using a user-supplied Palm™ Computer
or laptop PC.
Benefits of Proper Mixture Control
•Improved engine efficiency •Reduced maintenance costs
•Greater fuel economy •Reduced operating costs
•Smoother engine operation •Proper engine temperatures
•Longer spark plug life •Reduced engine vibration
JPI Probes
Temperature
information
processed by the
EDM is captured
by fast response,
grounded JPI
temperature
probes, that
accurately
measure the
small temperature changes—as small as 1°F—that occur during mixture
adjustment.
Temperature and Mixture
In a piston engine only a small portion of the energy from combustion
produces movement of the piston during the power stroke. The majority
of energy passes into the exhaust pipe as hot gasses. By monitoring the
temperature of these exhaust gasses you will have an indication of the
quality of the combustion process. Low compression, non-uniform fuel
distribution, faulty ignition, and clogged injectors diminish the efficiency
of the combustion process that generates power.
From the cockpit you can adjust the fuel/air ratio by a process called
leaning. Retarding the mixture control changes the fuel/air ratio and
hence the resulting Exhaust Gas Temperature (EGT).
The following figure depicts the mixture and temperature relationship.

For Your Safe Flight Page 3
As the mixture is leaned, EGT rises to a peak temperature, and then
drops as the mixture is further leaned. Peak power occurs at a mixture
using more fuel than at peak EGT. Best economy occurs at peak EGT.
Accurate leaning yields optimal engine temperatures. By being able to
precisely adjust the mixture, your engine can produce either the best fuel
economy or maximum power, whichever you choose.
A single EGT gauge merely gives you an average of each cylinder’s
temperature: some cylinders can be too rich, while others too lean.
Variations produced by differences in fuel distribution, ignition, and

Page 4 Engine Data Management
compression will cause each cylinder to follow its own mixture and
temperature relationship such that one cylinder will reach peak before
another.
Section 2 -Displays and Controls
The EDM monitors engine temperatures and voltages, assists in adjusting
the fuel/air mixture, and helps diagnose engine malfunctions. There are
three components of the user interface:
•Analog display including cylinder number and index dot
•Digital display for numeric readouts and messages
•Two front panel operating buttons.
Displays
Analog Display
The upper half of the face of the EDM is the analog display with %HP.
The following is a description of the analog display, from top to bottom.
Numbers in circles refer to features in the above diagram.

For Your Safe Flight Page 5
•Normalize and Percentage View Indicators
•Percentage view: when there is a dash — near the Pat the top of
the display (EDM-700) or NRM is not lighted (EDM-800), the
columns indicate percent of EGT red line. Each column is
composed of a stack of segments. A maximum height column
depicts 100 % of red line and a one segment-high column depicts
50 % of red line. For example, if the red line is 1650°F, a
maximum height column represents 1650°F and a one segment-
high column represents half that value, or 825°F. The
Percentage view permits comparison of EGTs across all
cylinders. Hotter cylinders display higher columns than cooler
cylinders.
•Normalize view: when there is a dash _ near the Nat the top of
the display (EDM-700) or the letters NRM are lighted on the left
side (EDM-800), the EGT columns are displayed normalized.
When you change to the Normalize view, all column peaks are
set to the same half-height level for trend analysis. Any changes
are shown as an increase or decrease in column height. A one-
segment change in column height represents a 10°F change.
The Normalize view permits rapid visualization of EGT trends,
rather than a percentage of red line. You should use normalize in
level cruise and run-up.
To toggle between Percentage and the Normalize views, hold the LF
button for five seconds until the display changes. The analog display
becomes half height and the display changes to the Normalize view.
Selecting the Normalize view does not affect the digital display nor alter
the parameter sequence. The CHT display—described later—is not
affected by the Normalize or Percentage view.
You may select the Normalize view in either the Manual or Automatic
mode. Normalize view is most helpful for engine trend monitoring of
each cylinder’s operation. For example using the Normalize view during
engine run-up, a fouled spark plug will appear as a higher column.
A common misapplication is to be in the Normalize view and then
change your power setting, causing all columns to go off scale, high or
low. Set to the Percentage view before adding or reducing power.
Always set Percentage View when beginning your descent.

Page 6 Engine Data Management
‚Temperature Units (°F or °C)
•°F temperatures in the digital display are in Fahrenheit degrees.
•°C temperatures in the digital display are in Celsius degrees.
To change the display of engine temperatures see “Changing the
Alarm Limits” on page 45.
ƒ„Cylinder Numbers and Dot Index
A row of numbers 1through 6and the letter Tare the column labels for
the analog display. The 1through 6are the cylinder numbers. If the TIT
option is installed, the Tdenotes the last column is displaying Turbine
Input Temperature (TIT) as a column. If the Tis absent and the Oil
temperature option is installed, the last column displays Oil temperature.
If both TIT and Oil temperature options are installed, the last column
displays TIT and the missing segment displays Oil temperature. The
highest Oil temperature segment will flash only when the digital display
shows OIL. The highest TIT segment will flash on when the digital
display shows TIT. A round dot under the numbers 1 through 6 indicates
that particular column is shown numerically in the EGT and CHT digital
display.
…†Bar Graph EGT and CHT
Each column in the bar graph is composed of a stack of segments. The
total height of each column represents the EGT and the missing segment
in the column represents the CHT.
•In the Percentage view, the EGT, TIT, and Oil temperature
resolutions depend on the programmed red line limits.
•CHT is displayed by a missing segment and should be
interpreted as follows: a missing segment corresponds to the
CHT in 25 F° increments, starting at 300°F at the bottom. In
the example shown here, the CHT is 400°F. If the EGT bar
is lower than the missing CHT segment, then the CHT will
be indicated by a single isolated lighted segment.
The CHT display is the not affected by mode or view.
‡Percent HP or RPM (EDM-800 only)
Displays percent of rated HP or RPM depending on pilot programming.
Digital Display
Beneath the bar graph is the 9-segment alphanumeric display.

For Your Safe Flight Page 7
EGT and CHT
When the dot index is beneath a cylinder number, 1 through 6, the digital
display shows the EGT on the left (four digits) and the CHT on the right
(three digits). Other parameters are displayed in the digital display as
described in the subsection “Parameter Scan—Systems without Fuel
Flow Option” on page 10.
Display Dimming
The entire display panel features automatic dimming. Allow ten seconds
for the display to adjust to ambient lighting conditions.
Modes
There are three standard operating modes of the EDM: Automatic,
Manual, and LeanFind. These modes will be described in more detail
beginning on page 11. Most of the time you will operate the EDM in the
Automatic mode. When you first turn on the power the EDM starts in the
Manual mode, but will enter the Automatic mode after two minutes. The
three modes affect primarily the digital display.
Automatic Mode
Just tap the LF button, then tap the STEP button. No user
intervention is required to use this mode. Each cylinder and each
parameter value is automatically sequenced and shown in the digital
display for a few seconds.

Page 8 Engine Data Management
Manual Mode
Just tap the STEP button. Automatic stops. Each indexed parameter is
frozen in the digital display until you manually index to the next
parameter by tapping the STEP button. If no button is depressed for 15
minutes, the Automatic Mode will resume.
LeanFind Mode
Simply pre-lean, tap the LF button and begin leaning. The EDM will
assist you in finding the first cylinder to peak.
Buttons
Buttons, Front Panel
Two operating buttons control all functions of the EDM.
The term tap will be used to denote pressing a button momentarily. The
term hold will be used to denote pressing and holding a button for five
seconds or longer.
STEP Button
Located on the lower left side near the instrument face.
•In the Automatic mode, tapping the STEP button will stop
and change to the Manual mode. Then each tap of the STEP
button will display the next parameter in the sequence.
•In the LeanFind mode tapping the STEP button will
terminate the LeanFind mode and change to the Automatic
mode.
Secondary functions of the STEP button include:
•In the Manual mode holding the STEP button will display the previous
parameters in the sequence (rapidly backwards).
•In the programming procedures, tapping the STEP button will advance to
the next item in the list.

For Your Safe Flight Page 9
•When an alarm is displayed, tapping the STEP button will temporarily
delete that alarm from appearing for the next ten minutes.
•When an alarm is displayed, holding the STEP button until the word OFF
appears will delete that alarm from appearing for the remainder of the
flight.
LF Button
Located on the lower right side near the instrument face.
•In Automatic or Manual modes, tapping the LF button will
change to the LeanFind mode.
•In Automatic or Manual modes holding the LF button for
three seconds will toggle between Percentage and Normalize
views.
•In the LF mode holding the LF button after peak EGT is
found will display peak EGT.
•In the LF mode tapping the LF button will mark a data
record in long term memory and display will flash SNAP.
Secondary functions of the LF button include:
•In the pilot programming procedure, holding or tapping the LF button is
used to increment or decrement parameter values and toggle between Yes
and No answers to questions.
STEP and LF Buttons
•Holding both the STEP and LF buttons simultaneously for
five seconds changes to the pilot programming procedure.
•Holding both the STEP and LF buttons simultaneously for
five seconds after entering LeanFind mode but before
beginning to lean will toggle between leaning “rich of peak”
and “lean of peak.”
•Tapping both the STEP and LF buttons simultaneously in
Manual mode toggles to include or exclude the displayed
parameter from the Automatic mode. It has no affect on the
displayed parameters in the Manual mode.

Page 10 Engine Data Management
Parameter Scan—Systems without Fuel Flow Option
The EDM steps through the engine parameters in a specific sequence.
Listed below is the sequence, parameter description and example of the
digital display.
Parameter Example Comments
Voltage, System Bus I4.2
BAT BATTERY VOLTAGE
Outside Air
Temperature
8I
OAT
°F or °C
Induction Air
Temperature
I25
IAT
Out of the intercooler
Compressor
Discharge
Temperature
300
CDT
Into the intercooler
Carburetor
Temperature
-22
CRB
Not available when
CDT is installed
Difference between
hottest and coolest
EGT
80
DIF
Dot indicates most
widely deviating
cylinder
EGT, CHT I340
376
EGT, left, CHT, right.
Dot indicates cylinder
TIT, Turbine Inlet
Temperature
I370
TIT
I370
TI2
Turbine #1, left
Turbine #2, right
Oil Temperature I 7 8
OIL
Shock Cooling -30
CLD
Dot indicates fastest
cooling cylinder
The display will pause at each parameter for four seconds in the
Automatic mode. (The four second pause time can be changed.) In the
Manual mode, tap the STEP button to advance to next parameter. Only
the parameters for the options that are installed will be displayed;
uninstalled parameters will not appear.

For Your Safe Flight Page 11
Section 3 -Operating Procedures
Diagnostic Testing on Startup and During Flight
When your EDM is first turned on, all digits light up for a few seconds,
permitting you to check for non-functional segments. Then each column
is self-tested in sequence while the EDM tests internal components,
calibration and integrity of the probes. If a problem is found, it will be
displayed as OPEN PRB or CAL ERR,followed by the name of the
probe or channel.
Display Channel Display Channel Display Channel
EGT I EGT #1 CHT I CHT #1 OIL Oil
EGT 2 EGT #2 CHT 2 CHT #2 TIT I TIT #1
EGT 3 EGT #3 CHT 3 CHT #3 TIT2 TIT #2
EGT 4 EGT #4 CHT 4 CHT #4 CDT CRB CDT carb
EGT 5 EGT #5 CHT 5 CHT #5 IND IAT
EGT 6 EGT #6 CHT 6 CHT #6 OAT OAT
During flight, probes are constantly checked for inconsistent or
intermittent signals. A faulty channel or probe encountered during start-
up or during flight will be deleted from the sequence, producing a
missing column or blank digital data.
Modes
The EDM has three different operating modes: Automatic, Manual and
LeanFind. When you first turn on the power the EDM starts in the
Manual mode, but will enter the Automatic mode after a few minutes.
The Automatic mode provides you with engine monitoring information
for the majority of flight conditions. To adjust the mixture, use the
LeanFind mode. And to display specific parameters, use the Manual
mode. In both the Automatic and Manual modes the analog display
shows a bar graph of EGT and CHT for each cylinder and the TIT and
Oil temperature.
Automatic Mode
Just tap the LF button, then tap the STEP button. No user
intervention is required to use this mode. In the Automatic mode the
EDM displays the parameter sequence at a user-selected rate (see
“Personalizing” on page 36).

Page 12 Engine Data Management
Individual parameters can be excluded from the Automatic mode: tap
STEP to enter the Manual mode. Tap STEP to index to the parameter
you want to exclude. Then tap both the STEP and LF buttons
simultaneously. Excluded parameters display a decimal point before the
parameter name. For example:
Included: I84 OIL Excluded:
I84 .OIL
Tapping the STEP and LF buttons simultaneously will toggle back and
forth between include and exclude.
•Every time you turn on the EDM, all parameters are reset to be
included.
•All installed parameters are always displayed in the Manual mode.
Exclusion only applies to the Automatic mode.
•All parameters are checked for alarm conditions every second
regardless of their included or excluded status.
Manual Mode
Just tap the STEP button. Use the Manual mode when you want to
monitor one specific parameter such as shock cooling during descent, or
a particular cylinder temperature during climbs. To change to the Manual
mode, tap the STEP button once. Subsequent taps will index the digital
display through the parameter sequence (see “Parameter Scan—Systems
without Fuel Flow Option” on page 10). To exit the Manual mode and
return to the Automatic mode, either tap the LF button and then tap the
STEP button or wait 15 minutes (see “How to Change Modes” in the
front of this manual). You may disable the Automatic mode by setting
“0” for scan rate.
LeanFind Mode—Leaning Rich of Peak
JPI’s EDM-700 and EDM-800 provide two methods of leaning: lean
rich of peak (LEAN R)or lean of peak (LEAN L). The standard
method is to lean about 20° rich of peak. With the advent of GAMI
injectors it is now possible to set the mixture lean of peak—saving fuel
and running the engine cooler. Teledyne Continental recommends lean of
peak for the Malibu. This manual primarily describes the rich of peak

For Your Safe Flight Page 13
method, and provides the procedure for the lean of peak method. The
default method is set to rich of peak.
Simply pre-lean, tap the LF button and begin leaning. Upon reaching
cruise configuration, you will use the LeanFind mode to identify the first
cylinder to reach peak EGT.

Page 14 Engine Data Management
LeanFind Procedure—Step-by-Step
Procedure Example Comments
1Establish cruise at approx.
65 to 75% power.
2PRE-LEAN THE MIXTURE
TO 50°F ESTIMATED RICH
OF PEAK EGT ON ANY
CYLINDER: _____°
I490
370
*For your first flight with the
EDM, use the method shown
below.
3Wait one minute Let engine stabilize.
4Tap the LF button LEAN
R
Start LeanFind. (Optionally to
change to “lean of peak”
method, hold both STEP and
LF simultaneously.)
5Lean the mixture—approx.
10°/second—while observing
the display. When there is a
15°F rise in EGT, LeanFind
mode becomes active.
I520
LF
Without FF
I520
I3.8
With FF
Flashing cylinder DOT
indicates hottest cylinder and
that LeanFind mode is active.
6Stop leaning when
a column begins flashing.
You will see LEANEST for two
seconds, followed by:
I545
SET
or with
Fuel Flow
I545
I 2.4
Flashing cylinder dot &
column indicates leanest
cylinder. (SET means Set the
mixture.) Due to thermal
inertia this will usually be
about -15°F lean of peak.
7If you hold LF, peak EGT will
be displayed while the LF
button is held down.
I560
PK
Captured peak EGT value is
displayed.
8Slowly enrich the mixture. the
temperature will increase,
returning to peak.
Stop enriching at the desired
EGT.
Best economy
Best power
I560
SET
I560
SET
I460
SET
•Peak EGT for best
economy
•100° rich of peak for best
power
9If you have chosen the Lean
of Peak method, at step 5
continue leaning until the last
cylinder has peaked.
-I5
SET
OR
-I5
Only for GAMI injected
engines. When each cylinder
reaches peak, the cylinder
number will begin flashing.

For Your Safe Flight Page 15
I2.3
*Determining the pre-lean value: while in cruise at under 65 percent
power, choose any cylinder and lean that cylinder to peak EGT in the
Manual mode or to engine roughness, whichever occurs first. Note the
peak, subtract 50° and write the resulting number in the space provided
in step 2.
LeanFind Procedure—General Explanation
Lycoming and Continental engines have established specific
restrictions on leaning that must be followed, such as
percentage of power, climb leaning, and TIT limits. Lycoming
recommends operation at peak EGT for power settings of 75%
or lower, while Continental recommends operation at peak
EGT for power settings of 65% or lower. This guide is not
meant to supersede any specific recommendations of the
engine manufacturer or airframe manufacturer.
It is your responsibility to know your aircraft’s limitations.
Pre-lean the mixture to about 50° below peak. After pre-leaning, wait for
one minute for the temperatures to stabilize. Next, begin the leaning
process by tapping the LF button. This tells the EDM to begin looking
for a 15° rise in EGT for any cylinder. Begin leaning the mixture. When
a 15° rise occurs, eliminating false peaks, the LeanFind mode becomes
activated shown when the cylinder dot above the column of the hottest
cylinder begins flashing. The LeanFind mode is not active until a
cylinder dot is blinking.
With the Fuel Flow Option, instead of seeing the word LF in
the display, you will see numerical fuel flow rate during the
leaning process on the right side of the digital display, for
example I2.4. This allows you to observe the EGT rise and at
the same time watch the fuel flow rate decrease.
To show the progress of the leaning process, the EDM selects the hottest
cylinder for reference in the digital display. In the example below, the
I360 is the current temperature of the hottest cylinder.

Page 16 Engine Data Management
Continue leaning slowly. With a vernier mixture control, turn the knob
about a quarter turn every second. With a non-vernier or quadrant
mixture control, lean slowly and smoothly about 1/16 inch every five
seconds. Eventually, one cylinder will reach peak before any of the other
cylinders. The EDM will determine this automatically. Notice that this
cylinder does not necessarily have the hottest EGT.
The EDM will indicate success in finding a peak by displaying the words
LEANEST for two seconds, followed by flashing the column and
displaying the value of the EGT of the cylinder that peaked first. The
word SET will also be displayed. (With the Fuel Flow Option the current
fuel flow rate will be displayed on the right side of the digital display
instead of the word SET.) The flashing cylinder will be locked—or
set—into the digital display during the remainder of the LeanFind
procedure to allow you to set the final mixture. The peak EGT value is
remembered by the EDM and will be displayed as long as you hold the
LF button.
You may now enrichen the mixture to operate at peak or continue
enriching to 100° rich of peak, or a value of your choice, consistent with
the procedures defined in your aircraft engine manual.