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Hirth's most popular engine! The 3203 produces more
horsepower and torque per pound than any other engine in its class. The Hirth 3203
is the forerunner in powerplants for the heaviest of ultralight trainers,
gyrocopters and light experimentals today. Factory recommended TBO is rated at 1000 Hrs. @ 75%
power.
3203 incorporates Al-Nikasil coated
cylinders for superior performance and reliability. Al-Nikasil in simple terms
is a nickel based material, applied in a paste form, when super heated it
becomes part of the cylinder itself. Al-Nikasil provides for a super low
coefficient of friction, reducing engine heat and wear. The pistons and
cylinders expand at the same rate thus providing for a seizure resistant
engine. 3203 crankshaft is 4130 chromemolly steel. Heads, cylinders, rings,
block casting, connecting rods and associated components are all of the highest
grade alloys available.
Model: |
3203 |
Carburation: |
Dual 34mm slide or optional electronic fuel injection |
Engine Type: |
2 cycle, two cylinder |
Fuel Pump: |
Auxiliary external pneumatic / electric pump with fuel injection |
Bore: |
76mm |
Lubrication: |
Fuel mixed with oil @ 50:1 or optional oil injection |
Stroke: |
69mm |
Rotation: |
Counter clockwise, viewed from output end |
Displacement: |
625cc |
Starter: |
12 volt electric, recoil, or both |
Compression: |
9.5:1 |
Cooling: |
Optional fan or free air cooled by prop |
HP Output: |
65hp @ 6300rpm |
Weight: |
73 lbs-free air, 79 lbs-fan cooled including electric start and
exhaust. Optional gearbox adds 19 lbs. |
Torque: |
55ftlbs @ 6000rpm |
Reduction Units: |
G-50 gearbox available in 2.16:l, 2.29:l, 2.59:l, 3.16:l and 3.65:l
ratios |
Ignition: |
Dual CDI |
Drive Coupling: |
Elastomeric dampener or optional centrifugal clutch. |