Walter Atom
# Walter Atom

The Walter Atom is an air-cooled horizontal two-cylinder engine used on light aircraft. The Atom is a Czechoslovakian engine first produced in 1934.

## Specifications (Atom)

### General characteristics

* Type: Horizontally-opposed 2 cylinder air-cooled
* Bore: 85 mm (3.35 in)
* Stroke: 96 mm (3.78 in)
* Displacement: 1.09 L (66.5 cu in)
* Length: 510 mm (20.08 in)
* Width: 815 mm (32.09 in)
* Height: 409 mm (16.10 in)
* Dry weight: 40 kg (88.2 lb)

### Components

* Valvetrain: 1 inlet and one exhaust valve per cylinder
* Fuel system: 2 Amal carburettors
* Fuel type: 68 octane
* Cooling system: air

### Performance

* Power output: 21 kW (28 hp) at 3000 RPM
* Compression ratio: 5.2:1
* Power-to-weight ratio: 2.14 kg/kW (3.52 lb/hp) at cruise
