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WARNING!  This is a non-certified aircraft engine, the possibility of engine failure exists at all times.  Do not operate this engine over densely populated areas.  Do not operate this engine over terrain where a safe, power off landing cannot be performed.  The operating and maintenance instructions supplied with this engine must be followed at all times.  Flying any aircraft involves the risk of injury or death, building an maintaining your own aircraft requires great personal responsibility.
hks 700e
available models
weights
specifications

Model

Gearbox Type / Ratio

Gearbox Configuration

Intake Manifold Type

Maximum Inertia Limit

10

A / 2.58

UP

HORIZONTAL

4000 kg/cm2

20

A / 2.58

DOWN

HORIZONTAL

4000 kg/cm2

30

A / 2.58

UP

UP

4000 kg/cm2

40

A / 2.58

DOWN

UP

4000 kg/cm2

50

B / 3.47

UP

HORIZONTAL

6000 kg/cm2

60

B / 3.47

DOWN

HORIZONTAL

6000 kg/cm2

70

B / 3.47

UP

UP

6000 kg/cm2

80

B / 3.47

DOWN

UP

6000 kg/cm2

Engine (dry, with all electrical equipment, electric starter, carbs and gearbox)

49.1 kg

108 lbs

Exhaust system

3.2 kg

7 lbs

Oil tank and cooler

2.7 kg

6 lbs

Totals

55.0 kg

121 lbs

Configuration

2 cylinders 4-stroke engine with horizontally opposed cylinders 4 valves per cylinder

Bore-stoke

85mm - 60mm

Displacement

680 cc

Compression ratio

11.3:1

Power output

56hp (41kW) at 5800 rpm (continuous); 60hp (44kW) at 6200 rpm (3min./take off)

Torque max

7 kgm at 5000 rpm

Max RPM

6200 rpm

cylinders

Nickel ceramic composite coated cylinders

Pistons

PVD coated piston rings

Valve gap

Automatic adjustment by hydraulic lifters

Camshaft

One central camshaft-pushrods-OHV

Direction of rotation

Counter clockwise (looking from pilot seat, tractor configuration)

Cooling

Air cooled cylinders.  Oil cooled cylinder heads.

Lubrication

Dry sump forced lubrication by Trichoid pump, Camshaft driven (pressure pump and scavenge pump equipped)

Ignition system

Dual CDI (captive discharge ignition)

Generator output

AC-12 Volts 210 Watts

Rectifier regulator

Three phase regulator

Starter

Electric only

Spark plugs

Denso IK24C11

Electrode spacing

1.1 mm

Fuel consumption

Approx. 9 litres per hour at 4750 rpm

Reduction gear

Integrated with torsional shock absorption