Bandini formula 3

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The 'Bandini formula three' is a racing car model produced from 1954 until 1958 by the company Cars of Forlì.

This type, produced at the same two-seater sports was born in order to participate in the category "race until 750 cm³" engine capacity which provided for the exclusive racing car use. This category gave birth to Formula Junior first, and the current formula three onwards; ereditiere purpose propedeutiche for future samples of specialties.

The characteristics that make important formula three (single-seater race 750) from the point of view of the historical Bandini are basically two: the unprecedented postponement of box differential and testing of disc brakes on four wheels.

The advantages of the latter were mainly limited solely to lower unsprung masses as the study of materials of seals of friction had not yet allow evolution that today poses this choice as a solution required the cars allocated to the races.

photos rear, highlighting disc brakes and the differential

The box to postpone the transmission instead, a system was also used in subsequent formula junior it offered a double advantage: making rapid replacement of two gears that determine the final drive ratio (allowing a rapid adaptation to the circuit) and, simultaneously, put significantly down the transmission shaft that conditioned to turn the position of the seat of the driver. This allowed a lowering of CG with the consequent improvement of road holding total of the car.

The racing debut occurred on July 1954 to the third edition of "Luigi Arcangeli Cup", raced on the Forlì circuit.

Ilario Bandini next to a formula Bandini 3

The same manufacturer Ilario Bandini, classified in second place in the race reserved for "single seater up to 750 cm³" valid for the Italian championship.

1 The Chassis
2 The Engine
3 The Body
4 Items related

[edit] The Chassis

The frame, weighs just 16 kilograms

The chassis keeps the characteristics, materials and design, used for torpedo two-seater sports, but the size, necessarily lower a car, make it possible to further cut the weight that descends so only 16 kg.

The instrumentation only shows: r engine, water temperature and pressure oil

Structure and material: frame of elliptical section tubes, special steel aeronautics derivation; patent No. 499843
Suspensions:
- Front: Independent, triangles overlapping with shock hydraulic telescopic tilted and springs cylindrical helical coaxial; bar Account
- Rear: a bridge with two rigid leaf spring semiellittiche longitudinal and shock hydraulic vertical telescopic
Braking system:
- Service: hydraulics, drum front and rear, as an alternative hydraulic disc on four wheels
- Parking: not found
Steering: a worm
Guide: single, central location
Wheels: ray Borrani
Tank: 25 Litres
Transmission: rear transmission with half shfat and central differential positioned reversed and box with quick change of relations (6 reports available)
Weight: bare chassis 16 kg
Weight total: 300 kg

[edit] The Engine

The first series Bandini engine 750

The three Bandini formula used the same engines which powered the two-seater sports the same period: Bandini-Crosley first and second series, although the duration of lesser races for single-seater allowed the use of modifications and adjustments "pushes" as an increase in the compression ratio or the use of rods alloy.

Positioning: forward longitudinal, 4-cylinder in-line
Materials and particularity: base 5 media bench and sump of aluminium of 5 litres capacity, head in aluminium DOHC Gear with 8 valves inclined, cylinders dismantled in ironcasted block.
Bore: 63.5 mm
Stroke: 59 mm
Displacement: 747 cm ³
Compression ratio: 11.2:1
Power: 2 Weber carburetors double body 35DCO3 horizontal or vertical
Power: 66 to 73 hp 9000 rpm
Lubricate: Carter with wet gear pump and filter external wire mesh
Cooling: forced liquid with centrifugal pump controlled by pulley and belt, cooler on the front
Gearbox and clutch: 4 speed+ RG, clutch single dry disc
Ignition and electrical equipment: coil and distributor on the head, battery 12 V and generator

The engine Bandini second series with carburettors vertical

[edit] The Body

The alloy body, made the Bandini were of two types; different especially on the front: a very similar to torpedo two-seater, with grid elements horizontal and vertical elliptical high and very rounded and the other lower and spigolosa with the air-intake front almost a semicircle. Both solutions were not welded to the body car but screwed to it, so as to enable the interchangeability as well as add convenience in the event of operations in the engine compartment or contacts to tender. As the front, the tail and side panels of the engine compartment were easily dismantled. They have openings in gills of sharks in the two positions in relation to the role: the air fresh or sfoghi of warm air). Their position reveals the use of different carburettors (horizontal or vertical). Almost always present instead sfoghi large rectangular body on the car, between the engine compartment and the cockpit, where the body is deeply dug. To protect aerodynamics of the driver, only a small "slide" or a windshield that wraps the whole but for a few centimeters in height. The tail, very short and at peak closed slightly above the rear axle at a point where goes also fin-rollbar, born immediately behind the driver.