Approved Installation Manual for the Experimental Report No 104
EDM-350 Page 25 of 46 Rev A
Engine Data Management System Date 7-10-2021
Manifold Pressure Calibration
The manifold pressure must be calibrated to the ambient air pressure. Enter the current ambient barometric
pressure. The engine must not be running. This setting is not the same as the altimeter setting that you receive from
ATIS or Unicom. It will vary with field elevation. Use the chart below to calculate the MP FACTOR. Multiply this MP
FACTOR by the altimeter setting that you receive from ATIS or Unicom. For example if the field elevation is 1700 ft
and the altimeter setting is 30.1, the MP FACTOR is 0.9400 from the table. Multiply 30.1 x 0.9400 to get the ambient
MP of 28.29.
Elev.
FACTOR
23. RPM Sensor installation
Use the J3 connector harness 790422 and connect the 3 leads using the supplied 3-pin connector and pins. There are
four types of magnetos commonly in use. You must have the correct RPM sensor for the magneto installed in the
aircraft. The following part numbers apply: Slick – pressurized 4000, -6000 series use JPI P/N 420809. For the Bendix
pressurized -1200 series use P/N 420807. Dual magnetos use JPI PN 420808. For the pressurized Bendix -20, 200
series & S6LSC-25P and non-pressurized Slick 600 use JPI P/N 420806. Mount the sensor in the vent plug closest to
the base of the magneto as shown in the appropriate diagram. Note: this is eligible for installation on all 4 & 6 cylinder
engines only.
.
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