While origins are often cloaked in mystery, the precise evolution of the Ducati 750 GT is still discernible. The bevel-gear twin cylinders with a 90° V configuration, long known as an "L-twin" configuration, have a precise date of birth: March 20, 1970. British historian Ian Faloon relates that Fabio Taglioni drew the first sketch of what is perhaps his most famous and best loved engine, which over the years was to acquire the affectionate name of "pompone" ("big pump"), on the last day of winter 1970.
It was not long before the prototype was on the bench. It was a twin cylinder (really, a motorcycle engine's ideal structure) arranged longitudinally and in a 90° V configuration. As far as balance went, this was also the best choice.
Taglioni's method was direct, logical, and practical. He envisioned the bike as an essential sports machine. The distribution used the same single overhead camshaft driven by bevel-gear as the single-cylinders, while the capacity of 750 cc was obtained with a bore and stroke of 76 x 75 mm. The prototype was built
rapidly. The result: a very personal sort of motorbike in which the engine played the central role, even stylistically.
The final bike was very similar to the prototype. The GT 750 appeared in June 1971. Its frame was more proportionate than that of the prototype, while the carburetors were 30 mm Amal Concentrics. It was also fitted with a front Lockheed disk brake. Its very name, Gran Turismo, immediately revealed that it was no sports bike, but the potential of this twin was immediately apparent to its enthusiasts.
|Type||Type 4 stroke 90° V twin configuration
Light alloy head and cylinders (with cast iron liner)
|Bore and Stroke||80 mm x 74.4 mm|
|Total displacement||748 cc|
||Single overhead camshaft driven by gear shaft/helical gear, two valves per cylinder|
|Lubrication||Wet sump forced lubrication with gear pumps, 4.5 liters oil|
|Carburetor||Two Amal Concentric 930 carburetors with 30 mm choke|
|Ignition||Distributor ignition with HT coil|
|Electrical equipment||12 V-150 W alternator and 12 volt 12 Ah battery|
||37.3 KW at 5250 rpm|
||200 kph position)
||Wet, multi-plate clutch
||Duplex open cradle tubular frame
||Front hydraulic telescopic forks
||Swinging arm rear suspension with adjustable hydraulic shocks
||280 mm disc|
||Full width drum
||3,60 x 19''|
||4,10 x 18'
|Fuel tank capacity||17 Liters