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Converting the Morgan from two double Weber carburettors to fuel
injection was quit challenging.
It involved conversion from mechanical fuel pump to a high pressure
multi injection fuel system. From mechanical distributor ignition
system to high precision 60-2 crank trigger high power direct fire
ignition system (DFU).
The air intake in the bonnet gives a lot of fresh air and should be
used. The space from the Weber’s should be used for a Plenum. The
inlet manifold should be modified with four injectors and a fuel
rail.
The air-intake and Plenum was first modelled in cardboard and cobber
foil, and then constructed in aluminium. Everything was also
designed for a later turbo upgrade.
My Morgan only had a single string fuel line from the tank and not
prepared for high pressure fuel circulation. I could make a return
line, but as the fuel should be pumped out of the tank it will not be
able to supply a high pressure pump.
I decided to build a ‘catch tank’ on 2.4 litre and have the high
pressure fuel circulating to that.
The high pressure (10bar) in-line fuel pump is circulating 2.5l/min
at 3 bars. A low pressure pump will fill-up the ‘catch tank’ with
1l/min at max and have a overflow drain back to the main tank.
The high pressure side is regulated to nominal 3 bars with a
Malpassi 384 fuel regulator.
Input from the Plenum to the Malpassi will keep the fuel pressure
constant regardless of vacuum (-0.7 bar) or overpressure (2 bar).
The Plenum is made to have approx 1.5liter and having a 64 mm
throttle body from a BMW735i. The throttle body is facing down and
having a Throttle Position Sensor (TPS) on the side.
The Plenum have output for a Manifold Absolute Pressure (MAP) sensor
and containing an Air Temperature Sensor and output for brake
assistance and fuel regulator. Extra outputs was left for later use
for a MAP instrument and a BOV (Blow Off Vent).
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