Lamborghini V8 Explained
| Lamborghini V8 |
| Manufacturer: |  Lamborghini |
| Production: | 1971-1988 |
| Configuration: | Naturally aspirated 90° V8 |
| Displacement: | 1995cc
2463cc
2997cc
3485cc
3798cc |
| Bore: | 2.0: 77.4mm
2.5/3.0/3.5: 86mm
3.8/GTP: 91mm |
| Stroke: | 2.0/2.5: 53mm
3.0: 64.5mm
3.5: 75mm
3.8/GTP: 73mm |
| Block: | Cast aluminium alloy |
| Head: | Cast aluminium alloy |
| Valvetrain: | 2 valves per cylinder,
2.0/2.5: SOHC,
3.0/3.5/3.8: DOHC |
| Fuelsystem: | Solex or Weber carburetors |
| Fueltype: | Petrol/Gasoline |
| Oilsystem: | Wet sump |
| Coolingsystem: | Water-cooled |
| Power: | 2.0: 1360NaN0 @ 7,800 rpm
2.5: 1640NaN0 @ 7,500 rpm
3.0: 1860NaN0 @ 7,500 rpm, or
1940NaN0 @ 7,500 rpm, or
1980NaN0 @ 7,800 rpm
3.5: 1900NaN0 @ 7,000 rpm
3.8/GTP: 5000NaN0 @ 10,000 rpm |
| Specpower: | 2.0: NaN1NaN1 per litre
3.5: NaN1NaN1 per litre
3.8/GTP: NaN1NaN1 per litre |
| Torque: | 3.0: 2730NaN0 @ 5,750 rpm |
| Successor: | Lamborghini V10 (indirect) |
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 Giampaolo Dallara. The all-aluminium alloy engine was introduced as a 2.5-litre variant, displacing 2463cc, but was expanded, by increasing the piston stroke to a 3.0-litre variant for 1975 - now displacing 2997cc.
A 2.0-litre reduced-stroke version was also introduced in 1975 for sale in Italy, displacing 1994cc, 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 3485cc,[2] for ease in meeting ever-tighter emissions requirements.
Specifications
- engine configuration
90° V8 engine; wet sump lubrication system
- engine displacement etc.
2.0: 1995cc; bore x stroke: 77.4x (stroke ratio: 1.46:1 - oversquare/short-stroke), NaNcc per cylinder
2.5: 2463cc; bore x stroke: NaNmm (stroke ratio: 1.62:1 - oversquare/short-stroke), NaNcc per cylinder
3.0: 2997cc; bore x stroke: NaNmm (stroke ratio: 1.58:1 - oversquare/short-stroke), NaNcc per cylinder
3.5: 3485cc; bore x stroke: NaNmm (stroke ratio: 1.15:1 - oversquare/short-stroke), NaNcc 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: 1360NaN0 @ 7,800 rpm; — Lamborghini Urraco
2.5 rated motive power & torque outputs and applications
1640NaN0 @ 7,500 rpm; — Lamborghini Urraco
- 3.0 rated motive power & torque outputs and applications: 2730NaN0 @ 5,750 rpm
1860NaN0 @ 7,500 rpm; — Lamborghini Urraco
1940NaN0 @ 7,500 rpm; — Lamborghini Silhouette
1980NaN0 @ 7,800 rpm; — Lamborghini Urraco
- 3.5 rated motive power & torque outputs and applications: 1900NaN0 @ 7,000 rpm; — Lamborghini Jalpa
External links
Notes and References
- Lamborghini Urraco & the V8s Urraco, Bravo, Silhouette, Athon, Jalpa. Jean-Francois Marchet, Osprey autohistory, 1983
- Web site: Lamborghini Urraco, Silhouette & Jalpa. CarsFromItaly.net. 9 January 2010.
