Английская Википедия:Ducati 350 Mark 3
Шаблон:Short description Шаблон:Use dmy dates Шаблон:Use British English Шаблон:Infobox motorcycle The Ducati 350 Mark 3 is a Шаблон:Convert single cylinder bevel drive SOHC motorcycle produced by the Italian manufacturer Ducati from 1968 to 1974. It was one of the first 'wide case' Ducati singles produced. A higher performance version, the Ducati 350 Mark 3D, which used desmodromic valves was also available.
Total production was around 2,300 Mark 3s and 1,350 Mark 3Ds.Шаблон:Sfn
History
Ducati had introduced the 350 Sebring in 1967 at the request of their American importer Berliner Motor Corporation (the US was Ducati's primary market at the time).Шаблон:Sfn The Sebring was an enlargement of the existing 250 cc model but designer Fabio Taglioni had concerns about the reliability of the bottom end, so the Sebring was produced in a mild state of tune.Шаблон:Sfn
Taglioni had designed strengthened versions of the engine for racing, culminating in the 1967 250SCD and 350SCD (Sport Corsa Desmo). The racing bikes used a duplex frame and the engine had wider mountings at the rear to match the twin rear tubes of the frame.Шаблон:Sfn
For 1968 Ducati introduced new engines to the 250 and 350 cc road bikes based on the racing engine. These retained the wider rear mountings and came to be known as 'wide case' engines.Шаблон:Sfn
Whilst sharing the same bore and stroke (Шаблон:Convert) as the Sebring, the Mark 3 had a higher compression ratio, hotter cam and bigger carburettor.Шаблон:Sfn The 1968 Mark 3 had a Leopoldo Tartarini designed 'bread box' Шаблон:Convert petrol tank with twin filler caps.Шаблон:Sfn A single filler version was introduced in 1969.Шаблон:Sfn
Few Italian-made models were imported during 1970-71 as the importers (Berliner in the US and Vic Camp in the UK) were in dispute with the factory over prices. During this period Spanish-built MotoTrans models were imported.Шаблон:Sfn
A new tank was fitted for 1971 and in 1973 a revised dual seat, side covers, instruments and headlight which were similarly styled to the 750 GT.Шаблон:Sfn These machines were finished in blue and gold. 35 mm Marzocchi forks and a twin-sided Grimeca front brake were also fitted that year.Шаблон:Sfn
The factory ceased production of OHC singles in 1974. The remaining stocks were purchased by the then British importer Coburn & Hughes, who continued to sell them until early 1976. These last Mark 3s used an engine produced under licence by the Spanish company MotoTrans.Шаблон:Sfn
Technical details
Engine and transmission
The single cylinder bevel drive OHC engine was of unit construction and had alloy head and alloy barrels with cast iron liners and was based on the 'wide case' engines used in the racers. Bore and stroke were Шаблон:Convert giving a displacement of Шаблон:Convert. A high compression 10:1 piston was fitted. Claimed power output was Шаблон:Convert @ 8,500 rpm, giving the machine a top speed of Шаблон:Convert. The kickstart mechanism has been upgraded from the earlier modelsШаблон:Sfn and a decompression lever fitted to non-desmo models to aid kicking the engine over.Шаблон:Sfn
Fuel was delivered by a 29 mm Dell'Orto carburettor.Шаблон:Sfn The engine used wet sump lubrication.Шаблон:Sfn Electronic ignition was fitted from 1973.Шаблон:Sfn
Primary drive was by helical gears to a multi-plate wet clutch and 5 speed gearbox. Chain drive took power to the rear wheel.Шаблон:Sfn
Cycle parts
The single cradle frame was a strengthened version of the 'narrow case' bikes and used the engine as a stressed member.Шаблон:Sfn Rear suspension was by swinging arm with twin 3-way adjustable Marzocchi shock absorbers.Шаблон:SfnШаблон:Sfn At the front Шаблон:Convert telescopic forks were fitted.Шаблон:Sfn Brakes were drums, the front being Шаблон:Convert diameter front and Шаблон:Convert rear.Шаблон:Sfn
Wire wheels were fitted with 275x18 front and 300x18 rear tyres. A wider 350 section tyre was fitted in 1971 and the front wheel increased to 19" in 1973.Шаблон:Sfn
From 1972 Шаблон:Convert mm Marzocchi forks and a twin-sided Grimeca front brake were fitted.Шаблон:Sfn
350 Mark 3D
A higher performance version of the Mark 3 was offered, the Mark 3D, that was fitted with a different head that used desmodromic valves.Шаблон:SfnШаблон:Sfn (A system where the valves are positively closed by extra lobes on the cam and levers rather than by a more conventional springs).Шаблон:Sfn The head was derived from that used on the 350 SCD racers. Although using a desmo system, lightweight hairspring valve springs were retained.Шаблон:Sfn The rest of the engine was the same as the non-desmo Mark 3, as were the cycle parts. The 3D produced Шаблон:Convert and had a top speed of Шаблон:Convert. Various options were available for this model, including a race kit, megaphone silencer and a fairing. With these fitted power increased to Шаблон:Convert and a top speed to Шаблон:Convert.Шаблон:Sfn
In 1971 the Mark 3 and the desmo models diverged, the desmo becoming the 350 Desmo with cafe racer styling,Шаблон:Sfn although in some markets the two models were known as the Mark 3 Tourer and the Mark 3 Special.Шаблон:Sfn The Desmo had clip-on handlebars, a fibreglass tank and a ‘monoposto’ single seat. It was finished in ‘bowling ball’ metal flake silverШаблон:Sfn which gave rise to it being nicknamed the silver shotgun.Шаблон:Sfn
A metal tank, different side panels and a combined seat and rear mudguard were fitted from 1973 and finished in the yellow and black colouring of the 750 S. In the final year of production, 1974, Ceriani front fork and a single Шаблон:Convert Brembo disk brake were fitted.Шаблон:SfnШаблон:Sfn
References
Bibliography
- Шаблон:Cite magazine
- Шаблон:Cite book
- Шаблон:Cite book
- Шаблон:Cite magazine
- Шаблон:Cite book
- Шаблон:Cite web
- Шаблон:Cite web
- Шаблон:Cite web
