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Isotta Fraschini ID36S 6V
1983



267

Description

In the post-war period, Isotta Fraschini, a historic Italian automotive company, undertook a significant process of industrial conversion, shifting its focus towards the production of diesel engines for marine, industrial and railway applications. Within this framework, new designs were developed, characterised by high robustness, versatility and ease of maintenance, intended to meet the demands of a rapidly expanding and diversifying market. Among these were the engines of the ID36 series, produced in a range of configurations with varying numbers of cylinders and intended for multiple applications, ensuring operational reliability and service continuity even under severe working conditions. Introduced in 1971, the ID36 series was manufactured over an extended period and further developed into numerous models, including versions for naval applications with specific requirements for the Navy, such as non-magnetic variants. The ID36S 6V model represents the smallest version, featuring a six-cylinder V configuration. Its constructional features and modular design facilitated its use across different sectors, from driving generating sets to marine propulsion and railway traction, all of which required reliable machinery with extended maintenance intervals. Within the railway sector, the ID36S 6V engines were employed in the first half of the 1960s in light-duty diesel-electric (LDe) locomotives of the Ferrovie della Sardegna and subsequently, in the early 1980s, in nVrec and nVDrec generator cars used for supplying electrical power to passenger train formations. Manufactured in 1983, the exhibited unit originates from the Palermo Locomotive Depot of Trenitalia and has been kindly donated.

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Technical specifications

ManufacturerIsotta Fraschini Motori S.p.A., Bari, from 1971 to the early 1990s
TypeID36S 6V
DescriptionFour-stroke diesel engine, with 6 cylinders in a 90° V configuration; cast iron crankcase with wet cylinder liners; individual cast iron cylinder heads; aluminium alloy pistons; forged steel crankshaft with five main bearings
Stroke170 mm
Bore170 mm
Displacement23.2 litres
Compression ratio13.2
Power output525 hp at 1800 rpm (rail traction rating); 640 hp at 2000 rpm (industrial application rating)
Specific power output22.7 hp/litre
Minimum specific fuel consumption159.6 g/hp·h
Valvetrain4 overhead valves per cylinder (two inlet, two exhaust), actuated by pushrods and rocker arms; one camshaft per bank located in the crankcase
Fuel feeding systemDiesel fuel, direct injection into the combustion chamber, supplied by a plunger-type pump with speed governor
Supercharging systemTwo centrifugal turbochargers (one per bank), driven by exhaust gases
Cooling systemLiquid-cooled, with forced circulation by a centrifugal pump
Lubrication systemForced lubrication, with two gear pumps; oil capacity: 56 litres
Width1200 mm
Length1400 mm
Height1467 mm
Mass1950 kg
Power-to-mass ratio3.71 kg/hp (rail traction rating)


Application

Light-duty diesel-electric (LDe) locomotives of the Azienda Regionale Sarda Trasporti

nVrec and nVDrec power generator railway cars

 

Kind donation of Trenitalia S.p.A.

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Testi e immagini di Giuseppe Genchi
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