The Lamborghini V8 is a ninety degree (90°) V8 petrol engine designed by Lamborghini in the 1970s for their less-expensive vehicles. It was only the second internal combustion engine ever developed by the company, and first saw production for the 1971 Lamborghini Urraco. 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, 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), for ease in meeting ever-tighter emissions requirements.
engine configuration90° 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
cylinder2.5: 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
cylinder3.0: 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 crankcasecast aluminium alloycylinder heads and valvetrain2.0/2.5: 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
aspirationNaturally aspirated
fuel system2.0: 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 applications136 kilowatts (185 PS; 182 bhp) @ 7,800 rpm; —
Lamborghini Urraco2.5 rated motive power & torque outputs and applications164 kilowatts (223 PS; 220 bhp) @ 7,500 rpm; — Lamborghini Urraco190 kilowatts (258 PS; 255 bhp) —
3.0 rated motive power & torque outputs and applications273 newton metres (201 lbf·ft) @ 5,750 rpm186 kilowatts (253 PS; 249 bhp) @ 7,500 rpm; — Lamborghini Urraco194 kilowatts (264 PS; 260 bhp) @ 7,500 rpm; — Lamborghini Silhouette198 kilowatts (269 PS; 266 bhp) @ 7,800 rpm; — Lamborghini Urraco
3.5 rated motive power & torque outputs and applications190 kilowatts (258 PS; 255 bhp) @ 7,000 rpm; —
Lamborghini Jalpa 
