WAM-120 Technical Details (2005)

Description

Configuration: 3 cylinder, 2-stroke, compression ignition, liquid cooled engine of inverted configuration with pressure fed lubrication and integral sump.
Forced induction: by turbocharger compressor to an intercooler, from which air passes through an integral blower to the engine cylinders and is thence exhausted through the turbocharger turbine.
Combustion system: low noise, clean burn, IDI; fuel injection is by a high pressure pump, lines and injectors; timing is factory set and adjustment is not required.
Valve gear: cam timing is factory set; the under-head camshaft is pressure fed with oil and operates 2 exhaust valves per cylinder via bucket tappets and shims; checking and adjustment via removable sump.
Cooling system: a gear driven pump circulates coolant through the engine and radiator, that can be mounted under the nose; an in-line thermostat provides temperature control.
Electrics: light weight, geared, permanent-magnet starter motor with pre-engaging solenoid. Automotive glow plugs. 12V, 30/40A alternator, with internal regulator.
Fuel system: an integral low pressure lift pump supplies fuel via an engine mounted fuel filter to a high pressure, engine oil lubricated, injection pump, with a return circuit to tank. Feed and return connections both AN-6.
Controls: Mechanical Control Unit (MCU) controls and stabilises engine fuelling and provides torque demand lever. Separate lever for engine shut-down. Torque and shut-down controls are both by standard aircraft type cables. A clevis fitting to crimp onto piano wire type cables is available.
Accessory drives: AND20010 propeller governor drive pad, with oil transfer sleeve and drillings, feeds engine oil, controlled to the correct pressure by the governor, to the propeller flange.
AND20000 drive pad on injection pump for vacuum pump, hydraulic pump or secondary alternator
Fuel: Jet-A1
Oil: 15W-40 synthetic (WAM supply)
Coolant: Cool-Elf Supra premixed

Performance


Power

Torque

Engine rpm

Specific Fuel Consumption

T.O. - max 5 min

90kW (120bhp)

312Nm

2750

300gm/kW hr (0.49lb/HP hr)

Max. continuous

75kw (100bhp)

275Nm

2575

275gm/kW hr (0.45lb/HP hr)

Economy Cruise

50kW (67bhp)

249Nm

2300

260gm/kW hr (0.43lb/HP hr) (16 litres/hr)

Cruise fuel flow is typically 20-25% less than gasoline engines at the same power setting.

Typical Installed Weights (kg)

With Constant Speed Propeller

Engine inc cooling pack

100.0

Propeller MTV-21

11.5

Jihostroj Governor/CSU

1.0

Prop. Nuts Washers (1/2" nylocks)

0.2

Oil cooler and hoses

1.5

Coolant Bottle and hose

0.6

Exhaust silencer and down pipe

2.5

Oil - 6 litres

4.8

Coolant - 3.5 litres

3.5

Lord mounts and AN7 bolts

1.6

Total

127.2


The WAM 3 cylinder

is in fact three different engines - there is a 100hp derated engine - a 120hpand a bigger bore 140hp

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