Ferrari 312 S.

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Ferrari 312 S, here already converted to the 412 S (with the Tipo 141 4.0 liter V12 engine)

The Ferrari 312 S was a Scuderia Ferrari racing car that was built in 1958 as a one-off and prototype . The car was later modified and was named Ferrari 412 S .

History of the 312 S

The only ever produced 312 S was an experimental sports car - a prototype . It had the chassis number s / n 0744 (chassis design type 524). The car was developed to meet the 3.0-liter capacity limit introduced after the serious accident at the Mille Miglia in 1957 .

engine

The 312 S was powered by a new 3.0-liter V12 engine developed by Vittorio Jano with two overhead camshafts per cylinder bank. The engine had the internal designation Tipo 142 .

The dimensions (such as bore and stroke) of the Tipo 142 were roughly the same as those of the 'old' 250 Colombo engine. The displacement was 2953.21 cm³. However, the maximum output of 320 PS (235 kW) at 8400 rpm was higher than that of the 250 TR (300 PS (221 kW) at 7200 rpm) with the Colombo engine. The mixture was prepared by six Weber 42DCN carburettors . The engine had one spark plug per cylinder and magneto ignition.

Frame and chassis

The car has a tubular steel frame, which was called Tipo 524 ' (Italian: "Prova"). The gearbox is installed in front of the rear axle together with the differential. The front wheels are individually suspended from two triangular wishbones of different lengths with coil springs and telescopic shock absorbers. The steering works with a worm and gear sector . The rear axle was a double on trailing arms guided De Dion axle with transverse leaf spring and telescopic dampers. An anti-roll bar was also installed. The complete car weighed 750 kg, while the weight of the 250 TR was 800 kg.

Racing history

The only race in which the 312 S was driven was the Grand Prix for sports cars in Spa-Francorchamps on May 18, 1958. Olivier Gendebien had to retire on the fourth lap due to problems with the transmission. After this race, the car was brought back to the factory, modified and then renamed "412 S".

the engine of the 412 S.
in the foreground the 1958 Ferrari 412 S "Monza" s / n 0744. Behind it a 250 Testa Rossa for comparison
The Ferrari 412 S in the showroom during the auction at RM Sotheby's

Conversion to the 412 S.

The only copy of the Ferrari 412 S was developed from the experimental chassis of the 312 S in combination with the engine that was previously used in the Ferrari 412 MI . The car kept the chassis no. (s / n 0744) of its predecessor. The body was designed and built (as with the 312 S) by Carrozzeria Scaglietti . The installed engine was the Tipo 141 with two overhead camshafts, as it had been used in June 1958 in the 412 MI monoposto at the 500 miles of Monza . Because of this, the car is sometimes mistakenly referred to as the 412 MI. The engine was still early in the Ferrari 335 S of Alfonso de Portago , with whom he had an accident in the Mille Miglia in 1957, are used.

The Tipo 141 engine designed by Vittorio Jano is a 4.0 liter V12 engine with two overhead camshafts per cylinder bank and two valves per cylinder. The displacement was 4023.32 cm³, and the maximum power was 432 hp (318 kW) at 8000 rpm. The compression was 9.9: 1 and the mixture was processed by six Weber 42DCN carburetors. The engine had two spark plugs per cylinder. The capacity of the fuel tank has been increased from 130 liters to 196 liters.

The suspension of the wheels differed only slightly from the previous model: the 412 S was equipped with hydraulic dampers, and in 1959 the drum brakes were replaced by disc brakes. The 412 S was one of the first Ferraris with this improvement.

Technical information / overview / comparison 312 S vs. 412 p

In its capacity as a prototype and experimental vehicle, various systems (such as suspension components and brakes) were tried out on this Ferrari (both as the 312 S and the 412 S) (Italian: "Prova").

Ferrari 312 S. Ferrari 412 S.
engine 60 ° V12 gasoline engine Tipo 157 installed lengthways at the front, cylinder heads and engine block made of aluminum
Displacement 2953.21 cm³ 4023.32 cm³
Bore × stroke 73 x 58.8 mm 77 × 72 mm
Compression ratio 9.4: 1 9.9: 1
Power at 1 / min 320 hp (235 kW) at 8400 rpm 432 hp (318 kW) at 8000 rpm
Specific performance: 108 PS / l (79.4 kW dm −3 ) 107 hp / l (78.7 kW dm −3 )
Valve control Two overhead camshafts per cylinder bank with two valves per cylinder
Mixture preparation six Weber 42 DCN carburettors
ignition One spark plug per cylinder, two ignition coils Double spark plugs per cylinder, two ignition coils
cooling water
transmission 4-speed gearbox with reverse gear (rear-wheel drive)
Brakes Drum brakes on all wheels Drum brakes (from 1959 disc brakes) on all wheels
Front suspension Independent suspension with wishbones of different lengths,
coil springs with telescopic dampers 		Independent suspension with wishbones of different lengths,
coil springs, hydraulic shock absorbers
Rear suspension de Dion axle , double trailing arms, transverse leaf spring,
telescopic damper, anti-roll bar 		de Dion axle, double trailing arms, transverse leaf spring,
hydraulic shock absorbers
Body and frame Aluminum body, tubular steel frame
wheelbase 2350 mm
Track width front / rear 1328 mm / 1310 mm
Front tire size 6.00 × 16 in
Rear tire size 7.00 × 16 in
Dimensions L × W × H (mm) unknown 4204 mm × 1651 mm × 1041 mm
Empty weight (without driver) 750 kg 880 kg
Tank capacity 130 liters 196 liters
Top speed 280 km / h unknown
Power to weight ratio 0.427 PS kg −1 (314 W kg −1 ) 0.49 PS kg −1 (361 W kg −1 )

Remarks

  1. ↑ Various sources indicate that different damping systems were tested on both vehicles.

Web links

Commons : 1958 Ferrari 312 S / 412 S s / n 0744  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d e f g https://www.ferrari.com/de-BE/auto/312-s
  2. ↑ a b Ferrari 250 Testa Rossa (1958) - Ferrari.com. Retrieved August 12, 2020 .
  3. ↑ https://www.racingsportscars.com/type/Ferrari/312%20S.html
  4. ↑ https://www.racingsportscars.com/results/Spa-1958-05-18-4896.html
  5. ↑ a b c https://www.ferrari.com/de-DE/auto/412-s
  6. ↑ a b c 1958 Ferrari 412 S Scaglietti Spyder - Images, Specifications and Information. Retrieved August 13, 2020 .
  7. ^ Godfrey Eaton: Ferrari: The Road And Racing Cars . Ed .: Haynes Publishing. Haynes Publishing, 1983, pp. 90-92 .
  8. ↑ http://mitorosso.com/412-mi-spyder-scaglietti/
  9. ↑ a b Ferrari 312 S (1958) - Ferrari.com. Accessed August 18, 2020 .
  10. ↑ a b Ferrari 412 S (1958) - Ferrari.com. Accessed August 18, 2020 .