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Franklin 6A8
1945 - 1951



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

ManufacturerAircooled Motors, Syracuse, New York, USA, from 1945 to 1951
Descriptionaircraft 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
Stroke108 mm
Bore127 mm
Displacement8209 cm³
Compression ratio7.0
Power215 hp at 2500 rpm
Valvetrain system2 overhead valves per cylinder, operated by pushrods and rocker arms
Fuel feeding systemwith one single-barrel Marvel Schebler MA4-5 gasoline carburetor
Ignition systemtwo 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 systemair-fed
Lubrication systemforced by a gear pump
Weight196 kg (with cooling fan and oil cooler)
Mass-to-power ratio0.91 kg/hp


Piaggio P.136 (amphibious aircraft for transport, patrol and rescue)

Republic RC-3 Seabee (amphibious light plane)

Waco Aristocraft Model W (light aircraft)

Testi e immagini di Giuseppe Genchi
Sito realizzato da Pasquale Pillitteri