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HIRTH engine
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Hirth-H37 engine
The H37E is a water cooled, reed valve controlled 3-cylinder-inline-2-...
The H37E is a water cooled, reed valve controlled 3-cylinder-inline-2-stroke engine with electronic fuel injection and Nikasil coated cylinders. It has one of the highest power to weight ratios available on the 90 HP engine market.
Ideally suited for light helicopters and all applications where weight is an issue and constant revolutions.
Factory recommended TBO is rated at 500 hours at 75 % power.
The warranty of the crank shaft is 3 years.

Technical data

Subject to technical changes

Type:

Three cylinder two stroke (inline)

Displacement:

939 cm3 (57.3 cu in)

Stroke:

69 mm (2,72 in)

Bore:

76 mm (2,99 in)

Max. performance:

According to DIN 70020

66,6 kW (90,6 HP) at 5200 rpm

Specification with 194°F coolant

Max. torque:

123 Nm (90.7 ft.lb) at 5000 rpm

Carburation:

multi point injection

Ignition System:

CDI

Generator Power:

250W12V

Cooling:

 Liquid cooling

Weight:

45kg(99.3 lb)

Starting device:

Electric starter

Running direction:

Counter-clockwise, view to output shaft

Lubrication type:

Auto lubrication

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