F.N. 3hp 4-cylinder Motor Cycle
From Object Wiki
| F.N. 3hp 4-cylinder Motor Cycle | |
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| Manufacturer | Fabrique Nationale d'Armes de Guerre |
| Production years | 1910-20 |
| Production location | Liege, Belgium |
Towards the end of 1904, a few small four-cylinder air-cooled engines were produced to provide compact, smooth-running power units for motorcycle propulsion. Among these designs were the F.N., the Binks, the Durkopp and the Laurin and Klement. The F.N., designed by Paul Kelecom and made by the Fabrique Nationale d'Armes de Guerre of Liege, Belgium, and employing an enclosed shaft and bevel-gear drive to the rear wheel, was the most successful of these and continued in this general form until 1923.
The example shown is one of the earliest engines produced (Serial No. 495).
[edit] How it Works
Each cylinder has a bore of 45 mm. and a stroke of 57 mm, giving the engine a total capably of 363 cc. The cast-iron crankcase is split longitudinally to receive the three-bearing, four-throw crankshaft, the connecting rods have split, white-metalled big-end bearings, and lubrication is effected by splash after oil is supplied to the crankcase by means of a hand pump. Individual inspection windows show the oil level in the crankcase.
The exhaust valves are operated by a camshaft and can be lifted by a hand control to release compression. The inlet valves are suction operated. A Bosch high-tension magneto, working in conjunction with a separate distributor driven from the front end of the camshaft, and a Brown & Barlow carburettor (which is not to original specification) are fitted.
The drive to the rear wheel is taken through a spring-loaded rush drive, incorporated in the external flywheel, and a pair of spur gears to the shaft drive contained within the right-hand rear frame stay. Later designs included a multi-plate clutch in the flywheel (1907), a 2-speed gear in the shaft-drive casing (1909), and mechanically-operated inlet valves (1913).
[edit] Memories
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[edit] In the Science Museum's Records
Inv: 1952-157 Lent by P. A. Clare, Esq.
This bike is part of our Biker Tribes feature, a planned special exhibition launching at the Science Museum during 2010. Your contributions to this page may be used in the exhibition. Explore all the motorbikes.
External Resources
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