Potez 4D
# Potez 4D

The Potez 4D was a four-cylinder, inverted inline aircraft engine. It was first built shortly before World War II, but did not enter full production until 1949. Like the other D-series engines, the cylinders had a bore of 125 mm (4.9 in) and a stroke of 120 mm (4.7 in). Power for different models was in the 100 kW-190 kW (140 hp-260 hp) range.

## Variants

### 4D-00

    127 kW (170 hp)

### 4D-01

    119 kW (160 hp)

### 4D-30

    179 kW (240 hp)

### 4D-31

    164 kW (220 hp)

### 4D-32

    179 kW (240 hp)

### 4D-33

    119 kW (160 hp)

### 4D-34

    194 kW (260 hp)

### 4D-36

    194 kW (260 hp) 4D-34 with aerobatic oil system

## Applications

* Morane-Saulnier MS.570
* Morane-Saulnier MS.700 Petrel
* Max Holste MH.52
* Nord 1202 Norécrin
* Nord 3202
* Nord 3400
* SIPA S.70
* S.N.C.A.C. NC-840 Chardonneret

## Specifications (Potez 4-D 01)

Data from Jane's All The World's Aircraft 1953-54.

### General characteristics

* Type: Four-cylinder air-cooled inverted inline engine
* Bore: 125 mm (4.92 in)
* Stroke: 120 mm (4.72 in)
* Displacement: 5.85 L (352 in³)
* Length: 1,207.5 mm (47.5 in)
* Width: 510 mm (20.1 in)
* Height: 668.5 mm (26.3 in)
* Dry weight: 143 kg (314.6 lb)

### Components

* Valvetrain: Two valves per cylinder with sodium cooled exhaust valves
* Fuel system: One Zenith carburettor
* Fuel type: 80 octane minimum
* Oil system: Dry sump with one pressure and two scavenge pumps
* Cooling system: air-cooled

### Performance

* Power output: 119 kW (160 hp) at 2,520 rpm (take-off), 97 kW (130 hp) at 2,360 rpm (Max cruise)
* Compression ratio: 7:1
* Specific fuel consumption: 245 gram/hp/hour (take-off)
* Power-to-weight ratio: 0.83 kW/kg (0.51 hp/lb) (take-off)
