Tehuelche (motorcycle)
Introduction Tehuelche with Alberto Gomez 1964.Restored Gomez motorcycle3Engine detailLegnano with Tehuelche engine- single overhead cam with chain drive distribution'''Tehuelche''' was an Argentine motorcycle that was produced between March 1957 and 1964.The Tehuelche was the only Argentine motorcycle that was mass-produced continuously in Argentina for seven years.The Tehuelche competed with the Puma Primera and Puma Segunda (from Guericke), the Zanella (from Ceccato), and the Gilera,. The Tehuelche distinguished itself not only by the characteristic sound of the gear train (SOHC engine), but also for its performance in its racing career.
Design Legnano with Tehuelche engine- single overhead cam with gear drive distributionThe creators of the Tehuelche were Juan Raffaldi and Roberto Fattorini. The two men moved to Argentina from Italy in 1949, specifically for this project. Raffaldi and Fattorini brought machinery and capital for the Tehuelche.In 1955, the two men designed the Telhuelche. Raffaldi included a four-stroke engine of 50 cc displacement (single overhead camshaft- SOHC). This design was a little unusual for its time; up until then, it had been used primarily in racing motorcycles. Furthermore, it had no oil pump and it was made totally out of aluminum.
Manufacture Raffaldi and Fattorini, along with several other partners, started mass-producing the Telhuelche. They raised the engine capacity to 75 cc to enter a new market category. This first partnership barely lasted two years, during which just over 1,200 motorcycles were produced.Raffaldi and Fattorini started another partnership with new members, continuing production until the middle of 1964.This partnership secured importation rights for Italian Legnano motorcycles and manufactured approximately 3,500 motorcycles, bringing the total number of Tehuelches ever produced to almost 5,000.
The models In its almost seven years of manufacture, some of the colors and the decals of the Tehuelche were changed.In 1962, two models were produced: the Sport and the Super Sport, the latter bearing a speedometer. In addition, since the second partnership had the right to import Legnano motorcycles from Italy, they introduced a model of the Tehuelche called the “Legnano,” hoping to increase sales.This model appeared on the market with a different gas tank and painted red and white. Finally, in 1964, toward the end of production, the camshaft that had been driven by gears was changed to a chain drive camshaft.File:Tehuelche con Jaime Enriquez 1963.jpg|Tehuelche with Jaime Enriquez 1963File:Tehuelche modelo 1957.jpg|Tehuelche 1957 modelFile:Tehuelche modelo 1960.jpg|Tehuelche 1960 modelFile:Tehuelche Super Sport 1963.jpg|Tehuelche Super Sport 1963File:Tehuelche Super Sport modelo 1963.jpg|Tehuelche Super Sport 1963 model
End of production In 1964,  Raffaldi and Fattorini decided to abandon the Tehuelche. Hyperinflation and government instability in Argentina made it difficult for them to continue.
Technical characteristics Tehuelche ad 1957Tehuelche ad 1960* Engine: Four-stroke** Cooling: Air** Bore: 48 mm** Stroke: 41 mm** Capacity: 75 cc** Compression ratio: 6.5:1** Power: 4.74 hp** RPM at maximum power: 6500** Approximate consumption: 1 liter of gasoline per 50 km** Distribution: Single overhead camshaft (SOHC)** Valves: Two valves arranged in a 90° configuration, operated through rocker arms. * Lubrication: Wet sump, splash lubrication. A hook, attached onto the connecting rod, dips into the oil in the sump and splashes it around the inside of the engine. ** Oil capacity: ½ liter* Clutch: Mono-disc in oil bath* Gearbox: Three-speed** Gear ratios:***1st gear        2.628***2nd gear        1.542***3rd gear        1** Speed relations:***1st speed: 28 km/h***2nd speed: 48 km/h***3rd speed: 74 km/h* Carburetion: Dellorto MA16 carburetor, made under license in Argentina. ** Diffuser diameter: 16 mm**High Speed Jet: #70**Idle Jet:  #30** Sprayer: 260* Frame: Chassis made out of welded steel tubes** Wheels: Steel rims, 18 inches x 1⅜** Tires (front and rear): 18 inches x 2¼** •	Tire pressure:*** Front: 22 lbf/in² (150 kPa)*** Rear: 28 lbf/in² (190 kPa)* Weight: 96 kgFile:Tehuelche despieze cabeza de cilindro.jpg|Tehuelche camshaft gear distribution blueprintFile:Tehuelche despieze carter distribucion.jpg|Tehuelche cylinder head blueprintFile:Tehuelche Kit distribucion cadena y bomba de aceite.jpg|Tehuelche single overhead cam with chain drive and oil pumpFile:Tehuelche motor lado distribucion.jpg|Tehuelche engine side view of single overhead cam with gear drive distributionFile:Tehuelche motor lado selector de cambios.jpg|Tehuelche engine side view of gear changeFile:Tehuelche-Legnano motor distribucion a cadena.jpg|Tehuelche-Legnano- engine with single overhead cam with chain drive distribution
References
External links *  Official Website ''Tehuelche the Motorcycle''* Book ''Tehuelche the Motorcycle'' ISBN 978-987-88-0341-8