Thursday, January 20, 2011

Lamborghini's New 704hp V12: Operation L539

Lamborghini has revealed an all-new 60-degree V12 engine , 46 years after company founder Ferruccio Lamborghini unveiled the marque’s first V-12 in 1964.
Known internally as the L539, the new 6.5-liter engine produces 704 bhp at 8250 rpm and 509 lb.-ft. of torque at 5500rpm. Despite the increase in power over the outgoing L537 engine, the new V-12 meets EU5 and LEV2 emissions standards, says research and design director Maurizio Reggiani.

The new powerplant’s crankcase is made from an aluminum-silicon alloy and has an open-deck construction with steel cylinder liners. Displacement is 6498 cc, with a 95 mm bore, a 76.4 mm stroke and cylinder spacing of 103.5 mm. The short-stroke layout is especially good for high-revving characteristics and low internal friction. Particular attention was also paid to the bearings for the forged and nitride-hardened crankshaft.
The two 4-valve-per-cylinder heads are sand-cast aluminum-silicon alloy, each weighing just 46 lb. The pistons and connecting rods are forged alloy and steel, respectively. Maximum piston speed at 8250 rpm is only 69 feet per second, which Lamborghini says is considerably less than for the Murciélago’s previous power unit. The 11.8:1 compression ratio is relatively high. As expected, the timing of the intake and exhaust is continuously variable.

A dry sump with eight scavenger pumps sucks oil out of the lower bedplate fastened to the crankcase, reducing pressure and scavenging losses by around 50 percent.
Reggiani says he’s particularly pleased with the in-house engine management system consisting of a main ECU, a secondary “smart actuator” and two additional black boxes that function as “smart sensors.” The sparkplugs also act as ionization sensors to detect and control knock.
Mated to this new V-12 is Lamborghini’s Independent Shifting Rods (ISR), a 7-speed robotized manual gearbox that’s capable of shifting gears in 50 milliseconds, says Reggiani.

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