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Rotax Engines
Hirth Engines
   Hirth 2702-40HP
   Hirth 2703-55HP
   Hirth 3202-55HP
   Hirth 3203-65HP
   Hirth 3503-70HP
   Hirth F30 (80HP-110HP)
   Hirth F33-28HP
   Hirth F23-50HP
   Hirth 3701 84HP - 100HP
Engine Mount Kit

HIRTH 2703's have the highest operational time of any Hirth engine. The 2703 produces more horsepower than any other engine in its power class and is the forerunner in power plants for light ultralight trainers, single seat gyrocopters, and experimentals today. 2703 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. 2703 crankshaft is 4130 chromemolly steel. Heads, cylinders, rings, block casting, connecting rods and associated components Factory recommended TBO is rated at 1000 Hrs. @ 75% power.
Hirth 2703-55HP

Model:

Model:

2703

Carburation:

Dual 38mm slide

Engine Type:

2 cycle, two cylinder

Fuel Pump:

Aux. external pneumatic

Bore:

72mm

Lubrication:

Fuel mixed with oil @ 50:1

Stroke:

64mm

Rotation:

Counter clockwise, viewed from output end

Displacement:

521cc

Starter:
Altenator:

12 volt electric, optional recoil
250 watt/20 amp alternator standard

Compression:

9.5:1

Cooling:

 Optional fan or free air cooled by prop

HP Output:

55hp @ 6200rpm

Weight:

75 lbs.-free air, 81 lbs-fan-cooled including electric start and exhaust. Optional gearbox adds 19 pounds.

Torque:

49ft/lbs @ 5600rpm

Reduction Units:

G-50 gearbox available in 2.16:1, 2.29:1, 2.59:1, 3.16:1, and 3.65:1 ratios. Various belt drives also available.

Ignition:

Dual CDI
(Capacitive digital Ign.)

Drive Coupling:

Elastomeric dampener or optional centrifugal clutch.