- La prima moto fu la AZZARITI (marchio vissuto dal 1933 al 1934) con due
motori, un 173 cc ed un 348 cc.....
- La prima auto in assoluto fu la Delage Grand Prix del 1914
- Il primo motore in assoluto il navale ARIES del 1907
- Il primo "bozzetto" teorico risale al 1896 con brevetto del tecnico Gustav
Mees
- Sseguito da un secondo brevetto "incompleto" nel 1910 depositato a nome
Arnott
Altro:
1910 Arnott (England) - Widely accepted to be first desmodromic timing system. Patent applied for, but process was never completed?
1914 Delage (France) - Grand Prix car uses "desmodromique" system, 4 valves per cylinder, pent roof combustion chambers, twin overhead cams. One cam opened the valve, the other closed it.
1917 Miller (USA) - "Golden Submarine", built for Barney Oldfield at a cost of $15,000. Uses a 4 cylinder aluminum alloy engine, 289 cid, Single overhead cam with desmodromic valves, dual intake ports for each cylinder, dual sparkplugs and magnetos.
1920 Bignan (France) - Sports car, won Spa 24 hours race and on the Brooklands circuit
1923 Fiat (Italy) - Patents variation of Bignan's system.
1924 Norton (England) - Patents desmo design, but never produces it?
1954 Arnott (England) - F. H. Arnott renews interest in engines. Converts 500cc JAP ohv single cylinder engines to desmodromics. Noting the use of springs in most earlier designs (due to manufacturing tolerances, etc) he states "the introduction of springs into a device intended to eliminate them had been an unnecessary complication, which in retrospect hampered the development of the principle"
1954 Mercedes (Germany) - Employs desmodromics on it's W196 GP car; 2.5L, 260hp straight eight engine. During development all springs are removed from system. Complexity goes down, performance unchanged. W196 proceeds to win two world championships. Also used on Mercedes' 300 SLR Sport race car.
(Enzo Ferrari is said to have considered using desmodromics following the success of Mercedes. He reportedly talks to Fabio Taglioni about it. Taglioni goes on to develop system for DucatiÉ Ferrari experiments with Desmo systems in the'90s)
1956 Ducati (Italy) - Taglioni develops desmo system for 125 GP bike; wins it's first race.
1958 Norton (England) - Develops four-cam system for 500cc motorcycle. Considered too bulky, never reaches production. (Aftermarket conversions are now available for various motorcycles howeverÉ)
1968 Ducati - Introduces the first mass produced system on Mark 3 Desmo 350 motorcycle. Similar system is still being used on current two-valve Ducatis.
1980 Ducati - Entire line of production motorcycles are now "Desmos"
1987 Ducati - Prototype four-valve system is used on 750cc twin cylinder motorcycle. Promptly wins Daytona "Battle of the Twins" race. (Designed in cooperation with Cosworth?)
1988 Ducati - Four-valve "Desmoquattro" system is introduced. Many World Superbike Championships follow.
1988 Ford (USA) - Receives patent for it's version of desmodromic valve system
2001 Delphi Technologies (USA) - Receives patent for Desmodromic Cam Driven Variable Valve Timing Mechanism
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