Lamborghini V8

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 Giampaolo Dallara. The all-aluminium alloy engine was introduced as a 2.5-litre variant, displacing 2463 cc, but was expanded, by increasing the piston stroke to a 3.0-litre variant for 1975 - now displacing 2997 cc.

A 2.0-litre reduced-stroke version was also introduced in 1975 for sale in Italy, displacing 1994 cc, 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 3485 cc, for ease in meeting ever-tighter emissions requirements.

Specifications

 * engine configuration: 90° V8 engine; wet sump lubrication system
 * engine displacement etc.
 * 2.0: 1995 cc; bore x stroke: 77.4 x (stroke ratio: 1.46:1 - oversquare/short-stroke), undefined cc per cylinder
 * 2.5: 2463 cc; bore x stroke: 86x53 mm (stroke ratio: 1.62:1 - oversquare/short-stroke), undefined cc per cylinder
 * 3.0: 2997 cc; bore x stroke: 86x64.5 mm (stroke ratio: 1.58:1 - oversquare/short-stroke), undefined cc per cylinder
 * 3.5: 3485 cc; bore x stroke: 86x75 mm (stroke ratio: 1.15:1 - oversquare/short-stroke), undefined 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, belt 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: 2 Magnetti Marelli coils and 1 Marelli Distributor S127E
 * exhaust system: ????
 * 2.0 rated motive power & torque outputs and applications: 136 kW @ 7,800 rpm; — Lamborghini Urraco
 * 2.5 rated motive power & torque outputs and applications
 * 164 kW @ 7,500 rpm; — Lamborghini Urraco


 * 3.0 rated motive power & torque outputs and applications: 273 Nm @ 5,750 rpm
 * 186 kW @ 7,500 rpm; — Lamborghini Urraco
 * 194 kW @ 7,500 rpm; — Lamborghini Silhouette
 * 198 kW @ 7,800 rpm; — Lamborghini Urraco


 * 3.5 rated motive power & torque outputs and applications: 190 kW @ 7,000 rpm; — Lamborghini Jalpa