Lamborghini V8

Lamborghini V8
Overview
Manufacturer Lamborghini
Production 1971-1988
Combustion chamber
Configuration 90° V8 petrol engine
Displacement 2.0: 1,995 cc (121.7 cu in),
2.5: 2,463 cc (150.3 cu in),
3.0: 2,997 cc (182.9 cu in),
3.5: 3,485 cc (212.7 cu in)
Cylinder bore 2.0: 77.4 mm (3.05 in)
2.5/3.0/3.5: 86.0 mm (3.39 in)
Piston stroke 2.0/2.5: 53.0 mm (2.09 in)
3.0: 64.5 mm (2.54 in)
3.5: 75.0 mm (2.95 in)
Cylinder block alloy Cast aluminium alloy
Cylinder head alloy Cast aluminium alloy
Valvetrain 2 valves per cylinder,
2.0/2.5/3.0: single overhead camshaft,
3.5: double overhead camshaft
Combustion
Fuel type Petrol/Gasoline
Oil system Wet sump
Cooling system Water cooled
Output
Power output 2.0: 136 kW (185 PS; 182 bhp) @ 7,800 rpm
2.5: 164 kW (223 PS; 220 bhp) @ 7,500 rpm, then 190 kW (258 PS; 255 bhp)
3.0: 186 kW (253 PS; 249 bhp) @ 7,500 rpm, or
194 kW (264 PS; 260 bhp) @ 7,500 rpm, or
198 kW (269 PS; 266 bhp) @ 7,800 rpm
3.5: 190 kW (258 PS; 255 bhp) @ 7,000 rpm
Specific power 2.0: 68.2 kW (92.7 PS; 91.5 bhp) per litre
3.5: 54.5 kW (74.1 PS; 73.1 bhp) per litre
Torque output 3.0: 273 N·m (201 lbf·ft) @ 5,750 rpm

The Lamborghini V8 is a ninety degree (90°) V8 petrol engine designed by Lamborghini in the 1970s for their less-expensive vehicles.[1] It was only the second internal combustion engine ever developed by the company, and first saw production for the 1971 Lamborghini Urraco.[2] It was designed by Gian Paolo Dallara. The all-aluminium alloy engine was introduced as a 2.5-litre variant, displacing 2,463 cubic centimetres (150.3 cu in), but was expanded, by increasing the piston stroke to a 3.0-litre variant for 1975 - now displacing 2,997 cubic centimetres (182.9 cu in).

A 2.0-litre reduced-stroke version was also introduced in 1975 for sale in Italy, displacing 1,994 cubic centimetres (121.7 cu in), because of Italian legislation which imposed punitive taxes on cars whose engines displaced more than 2.0 litres.

This V8 engine was also used in two other models, the Lamborghini Silhouette in 1976-1977 in which it kept the 3.0-litre displacement,[2] and the slightly updated replacement in 1982, the Lamborghini Jalpa, which saw the engine increased in size to 3.5 litres, displacing 3,485 cubic centimetres (212.7 cu in),[2] for ease in meeting ever-tighter emissions requirements.

Specifications

engine configuration
90° V8 engine; wet sump lubrication system
engine displacement etc.
2.0: 1,995 cubic centimetres (121.7 cu in); bore x stroke: 77.4 by 53.0 millimetres (3.05 in × 2.09 in) (stroke ratio: 1.46:1 - oversquare/short-stroke), 249.4 cc per cylinder
2.5: 2,463 cubic centimetres (150.3 cu in); bore x stroke: 86.0 by 53.0 millimetres (3.39 in × 2.09 in) (stroke ratio: 1.62:1 - oversquare/short-stroke), 307.9 cc per cylinder
3.0: 2,997 cubic centimetres (182.9 cu in); bore x stroke: 86.0 by 64.5 millimetres (3.39 in × 2.54 in) (stroke ratio: 1.58:1 - oversquare/short-stroke), 374.7 cc per cylinder
3.5: 3,485 cubic centimetres (212.7 cu in); bore x stroke: 86.0 by 75.0 millimetres (3.39 in × 2.95 in) (stroke ratio: 1.15:1 - oversquare/short-stroke), 435.7 cc per cylinder
cylinder block and crankcase
cast aluminium alloy
cylinder heads and valvetrain
2.0/2.5: cast aluminium alloy, two valves per cylinder, 16 valves total, chain driven single overhead camshafts
3.0/3.5: cast aluminium alloy, two valves per cylinder, 16 valves total, chain driven double overhead camshafts
aspiration
Naturally aspirated
fuel system
2.0: 4 twin-barrel down-draught Weber 40 IDF 1 carburettors
2.5: 4 twin-barrel down-draught Weber 40 IDF 1 or Solex C40P117 carburettors
3.0: 4 twin-barrel down-draught Weber 40 DCNF carburetors
3.5: 4 twin-barrel down-draught Weber 42 DCNF carburetors
ignition system and engine management
????
exhaust system
????
2.0 rated motive power & torque outputs and applications
136 kilowatts (185 PS; 182 bhp) @ 7,800 rpm; — Lamborghini Urraco
2.5 rated motive power & torque outputs and applications
164 kilowatts (223 PS; 220 bhp) @ 7,500 rpm; — Lamborghini Urraco
190 kilowatts (258 PS; 255 bhp) —
3.0 rated motive power & torque outputs and applications
273 newton metres (201 lbf·ft) @ 5,750 rpm
186 kilowatts (253 PS; 249 bhp) @ 7,500 rpm; — Lamborghini Urraco
194 kilowatts (264 PS; 260 bhp) @ 7,500 rpm; — Lamborghini Silhouette
198 kilowatts (269 PS; 266 bhp) @ 7,800 rpm; — Lamborghini Urraco
3.5 rated motive power & torque outputs and applications
190 kilowatts (258 PS; 255 bhp) @ 7,000 rpm; — Lamborghini Jalpa

References

  1. ↑ Lamborghini Urraco & the V8s Urraco, Bravo, Silhouette, Athon, Jalpa. Jean-Francois Marchet, Osprey autohistory, 1983
  2. 1 2 3 "Lamborghini Urraco, Silhouette & Jalpa". CarsFromItaly.net. Retrieved 9 January 2010.
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