The eye-catching 4C Concept will be making its UK debut this week in Goodwood, where it will be shown off as a static exhibition on the official Alfa Romeo stand. Ever since the covers were flung off the concept sports car Alfa Romeo has claimed that the 4C Concept will be put into production, from 2012, and will lead out the brand's continually-postponed U.S. relaunch. From its appointment at Goodwood the $C Concept will be trucked off at speed to Paris where next Monday it will be showcased at the flagship Fiat Group Automobiles showroom at 2, Rond-Point des Champs-Elysées.

The overall shape of the 4C, while developing some thinking from the 8C Competizione, shows a strong similarity to the Lotus Evora, particularly in the glass house form, the glass engine cover and the overall design language shapes. Other external influences melded into the new project include the venting in the frame around the engine cover which is reminiscent of Ferrari's 360/430. Alfa Romeo says the 4C has a "length of approximately 4 metres and a wheelbase of less than 2.4 metres." The length is around 27 mm longer than the KTM X-Bow (3.73 m) on which it is based and would be accounted for by the new enveloping bodywork, although more curiously the X-Bow's wheel base is 2.43 m, implying a shortening of the wheelbase due to the new rear subframe.

For the 4C Concept Alfa Romeo has used learning gained with the 8C Competizione in the areas of carbon fibre, aluminium and rear-wheel drive, adding to the mix technology derived from models currently on sale: the 1750 turbo petrol engine fitted with direct injection, the "Alfa TCT" twin dry clutch transmission (which recently went on sale in the Alfa MiTo) and the Alfa DNA dynamic control selector.

Using the X-Bow's carbon fibre monocoque, along with aluminium for the rear engine housing structure and the crash boxes, and confirming that the new bodywork developed by Dallara is "crafted completely from carbon", has allowed Alfa Romeo's engineers to impressively keep the weight of the concept car to a claimed 850 kg (X-Bow "Street" by comparison is 790 kg) and while the power output isn't revealled, Alfa Romeo says that the "extensive use of carbon, which also plays a structural role and guarantees exceptional agility with a weight/power ratio which is lower than 4 kg/HP." However this is still just a concept showcar and kerb weight is bound to rise if the car does make it to production in the future, particularly as Alfa Romeo has a strong reputation for being unable to keep weight from spiralling on its production cars.

The name "4C Concept" is meant to be suggestive of the sports driving pleasure from the "4 cylinder" 1750 turbo petrol engine "which offers over 200 HP" - says Alfa Romeo. Already featured on a number of models in production, for example the Giulietta Quadrifoglio Verde, the engine boasts cutting-edge technical solutions such as direct injection, dual continuous variable valve timing, turbocharger and the revolutionary scavenging control system which eliminates turbo lag.

Located centrally in the rear of the vehicle, the engine in the 4C Concept ensures a performance which matches or exceeds that of a 3 litre engine whilst still delivering the moderate fuel consumption which is typical of a compact, 4 cylinder engine. Coupled with the new automatic "Alfa TCT" twin dry clutch transmission, launched only a few months ago on the MiTo and which will soon be available on the Giulietta, the 1750 Turbo petrol engine in this application allows the 4C Concept to reach a claimed top speed of over 250 km/h and to accelerate from 0 to 100 km in under 5 seconds. The vehicle also integrates its Alfa DNA technology.

The Alfa Romeo 4C Concept has a sophisticated suspension layout, retaining the high quadrilateral at the front but adding a MacPherson strut arrangement at the rear, to ensure agility and road handling. This solution, along with the rear-wheel drive and the weight/power ratio, should add up to driving pleasure, enhanced even further by the weight distribution of 40 percent on the front axle and 60 percent on the rear axle.