Franklin 6A8
1945 - 1951
Description
The Franklin 6A8 is an air cooled 6-cylinder boxer engine, produced by the Aircooled Motors Inc., in Syracuse in the state of New York. It has been used over the years on seaplanes and amphibian aircrafts, such as the Republic RC-3 Seabee and the Piaggio P.136.
Technical specifications
| Manufacturer | Aircooled Motors, Syracuse, New York, USA, from 1945 to 1951 |
| Type | 6A8-215-B9F |
| Description | aircraft engine with 6-opposed cylinders (boxer-type), aluminium alloy crankcase composed of two parts with 5 main bearings, cylinders with integrated aluminium alloy head and internal hot-forced steel liners |
| Stroke | 108 mm |
| Bore | 127 mm |
| Displacement | 8209 cm³ |
| Compression ratio | 7.0 |
| Power | 215 hp at 2500 rpm |
| Valvetrain system | 2 overhead valves per cylinder, operated by pushrods and rocker arms |
| Fuel feeding system | with one single-barrel Marvel Schebler MA4-5 gasoline carburetor |
| Ignition system | two spark plugs per cylinder fed by two independent systems: one of the inductive discharge type with distributor Auto-Lite 1AM-4001 and the other with a magnet distributor Spark S6LN-31, firing order 1-4-5-2-3 -6 |
| Cooling system | air-fed |
| Lubrication system | forced by a gear pump |
| Weight | 196 kg (with cooling fan and oil cooler) |
| Mass-to-power ratio | 0.91 kg/hp |
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Application
Piaggio P.136 (amphibious aircraft for transport, patrol and rescue)
Republic RC-3 Seabee (amphibious light plane)
Waco Aristocraft Model W (light aircraft)
