Applicable to: B22 and B25 (a ll versions)
Revision 1.3 – 02/24/ 2015
Manual B – Operations
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19
B.4. ENGINE DESCRIPTION
B.4.1. General Characteristics
4 stroke Otto cycle
4 cylinder boxer
Single Over Head Camshaft (SOHC), timing with gears and chain, cam follower and tapper
with valve shim, two valves per cylinder.
Cooling system with a coolant and pump with two different circuits, one for each side of the
engine, expansion tank and thermostat integrated on the engine. All cooling circuit pipes are
stainless steel.
Forced lubrication with internal gear (geretor) pump, semi-dry sump without external pipe.
Mapped ignition f(RPM,MAP), with inductive coil, with dwell time mapped f(VBATT) and
ignition correction f(engine temperature)
Mapped fuel injection f (RPM,MAP), with correction f(engine temperature, air temperature)
Data transmission from the ECUs to EMS system on CAN bus
Fuel system with an electric fuel pump controlled by the ECUs, and an auxiliary electric fuel
pump, the fuel circuit is done with steel pipe, and the fuel pressure regulator is integrated in
the fuel circuit
The reduction gear box uses specific oil that is separate from the engine oil, it has a helical
gear and monolithic propeller shaft, and it is designed for an oil pump for the hydraulic
constant speed governor.
ADC (Automatic Damping Control) to control the torsional vibration up to 2500 rpm
Electric starter motor and start relay pre- installed on the engine
Oil cooled alternator and voltage regulator pre- installed on the engine.
B.4.2. Engine Models
The following table summarizes the main features of the
AeroPower
family of engines.
Next to the name is shown the model and the respective version, which appears in the
identification code shown on the top of each engine. (see picture B.2.3.1.P).
Name
Model
Version
Power
[CV]
Engine RPM
[rpm]
Prop RPM
[rpm]
B22D
MWB
A
95
3300
3300
B22H
MWB
B
131.5*
4300
---
B22L
MWB
C
114.7
3950
2280
B22R
MWB
D
130.3
4550
2320
B25D
MWC
E
110
3300
3300
B25L
MWC
F
133.1
3950
2280
B25R
MWC
G
154.2
4550
2320
B25H
MWC
H
156*
4300
---
B.4.2.1.C
* Data refers to the version without reduction gear box
The B22H and B25H models are available with or without a reduction gear box. In the second
case the performance is reduced by 5%.
All of the engine models can be supplied with a pre-installed EMS kit which includes sensors and
cables for any EFIS and EMS instrumentation with a CAN line available to receive the data from
the ECUs. For more detail see paragraph A.16.1.