Potez 4E

The Potez 4E is a French air-cooled flat-four piston engine of the 1960s. It was unveiled at the 1959 Paris Air Show,^[1] entered production in 1960 and is rated at 78 kW (105 hp).^[2] It remained in production until 1965 when Potez abandoned production of aero-engines.^[3][4]

Potez 4E
Type	Air-cooled flat-four engine
National origin	France
Manufacturer	Potez
Major applications	SAN Jodel D.150 Mascaret
Produced	1960–1965

Variants

4E-00

67.1 kW (90 hp)^[5]

4E-02

4E-20

78.3 kW (105 hp)^[5]

4E-30

Fuel injected. 86.5 kW (116 hp)

Applications

• Chasle Tourbillon
• Dabos JD.24P D'Artagnan
• Godbille JG.1B
• Merville D.63
• Piel Emeraude
• Pottier P.60 Minacro
• Jodel DR1050 Excellence
• SAN Jodel D.150 Mascaret
• Starck AS-27 Starcky

Specifications (Potez 4E-20)

Data from ^[2][5]

General characteristics

• Type: direct drive right-hand tractor air-cooled flat-four piston engine
• Bore: 110 mm (4.33 in)
• Stroke: 90 mm (3.54 in)
• Displacement: 3.42 L (208.70 cu in)
• Length: 782 mm (30.8 in)
• Width: 778 mm (30.6 in)
• Height: 605 mm (23.8 in)
• Dry weight: 92 kg (203 lb) dry un-equipped, 103 kg (227 lb) equipped

Components

• Valvetrain: Two valves per cylinder with dual springs operated by rockers and pushrods from a gear driven camshaft.
• Fuel system: One NAS 42 Zenith carburettor
• Fuel type: 100/130 octane
• Oil system: Pressure feed to bearings and moving parts at 300–480 kPa (43–70 psi), oil grade SAE 50 and 40
• Cooling system: Air-cooled
• Reduction gear: Direct drive
• 12 Volt Ducellier electric starter motor, 12 Volt 250 Watt belt driven generator

Performance

• Power output: 78 kW (105 hp) at 2,750 rpm for take-off, 61 kW (82 hp) at 2,600 rpm at 910 m (3,000 ft) cruising
• Specific fuel consumption: 0.298 kg/kW/hr (0.49 lb/hp/hr) at normal cruising power
• Oil consumption: 0.18 kg (0.40 lb)/hour
• Power-to-weight ratio: 1.68 kW/kg (1.02 hp/lb)