Franklin O-540
# Franklin O-540

The Franklin O-540 (company designation 8AC) was an American air-cooled aircraft engine that first ran in the early-1940s. The engine was of eight-cylinder, horizontally-opposed layout and displaced 540 cu in (9 L). The power output was nominally 300 hp (224 kW).

## Variants

### 8ACG-538 (XO-540-1)

    Geared propeller drive at 0.632:1, 300 hp (224 kW) at 3,200 rpm

### 8ACSA-538 (XO-540-7)

    Supercharged, 300 hp (224 kW)

### 8ACGSA-538 (XO-540-3/O-540-5)

    Supercharged and geared,330 hp (246 kW) at 3,200 rpm

## Applications

* Northrop N-9M

## Specifications (8ACG-538/XO-540-1)

Data from

### General characteristics

* Type: 8-cylinder air-cooled horizontally opposed aircraft piston engine
* Bore: 4.625 in (117.5 mm)
* Stroke: 4.0 in (101.6 mm)
* Displacement: 537.6 in³ (8.8 L)
* Dry weight: 438 lb (199 kg)

### Components

* Cooling system: Air-cooled

### Performance

* Power output: 300 hp (224 kW) at 3,200 rpm
