Join Date: Nov 2009
Thanked: 320 Times
| | Lambo's V12 engine for Murcielago's successor
Lamborghini revealed the specs of the next gen flagship model .
Here are the article's related to it courtesy autoexpress and autocar UK
It’s official! Lamborghini has lifted the lid on the engine and gearbox that will power the replacement for the Murcielago supercar. |
The supercar will have an all-new V12 engine and an innovative new gearbox, which Lamborghini boss Stephan Winkelmann claims will jump its supercar “two generations ahead in every sense”.
The new car, often incorrectly called the Jota, is codenamed LP837, and will be capable of sprinting from 0-62mph in less than three seconds and will hit a top speed in excess of 217mph. The 6.5-litre V12 engine will boast 690bhp and 690Nm of torque , and while it shares the same capacity as the outgoing engine, the new powerplant does not share a single component with the outgoing Murcielago’s motor.
The new engine is hand-built in Sant’Agata rather than on Audi’s production lines. It features an increased rev limit, up from 8,000rpm to 8,250rpm, and the overall weight is down by 18kg to 235kg. The engine will be mounted 60mm lower in the chassis than the Murcielago’s V12 to ensure that the new car’s centre of gravity is as low as possible.
Lamborghini has confirmed that the new car will use a lightweight carbon fibre chassis, as previewed by the stunning Sesto Elemento concept car shown at the Paris Motor Show, which trims the current car’s 1,650kg weight by 150kg. This helps improve the efficiency of the new car by 20 per cent over the old LP640.
However the efficiency gains are more from the loss of weight than fuel saving tech, as the new engine does not feature direct injection – this will come in 2015, which is the deadline Lamborghini has set itself to reduce its fleet emissions by 35 per cent.
Lamborghini has also confirmed a new single clutch gearbox. Winkelmann is not a fan of double-clutch gearboxes as they “lack the emotion needed for supercars.” Instead, Lamborghini has worked with Italian transmission specialist Graziano, to provide a lightweight seven-speed gearbox which shifts gear in just 50 milliseconds, or about 40 percent faster than the Gallardo Superleggera’s E.Gear.
The gearbox will send power to all four wheels via a Haldex all-wheel drive system in place of the current viscous-coupling system. In normal running, the drive is split 30:70 front-to-rear, but can shift instantly to give 60 percent torque to the front.
Autocar UK :
Lamborghini’s R&D team was given just two criteria for the new motor, codenamed L539 and designed from a blank sheet of paper: it had to be a V12 and have a 60-degree bank. |
In the end the team ended up with the old motor’s 6.5-litre capacity, but 59bhp more, at 691bhp. There’s more torque, too - a peak of 509lb ft - and it’s available 500rpm further down the rev range, at 5500rpm.
The bore increases, from 88mm to 95mm, but the stroke is down from 89mm to 76.4mm; the compression ratio is 11.8:1, compared with the old unit’s 11:1. There’s also a useful reduction in weight, from 253kg to 235kg, and the dry sump height is just 120mm, 75mm lower than the old motor’s. “This makes a big difference in the centre of gravity,” chief engineer Maurizio Reggiani says.
Features to improve the motor’s efficiency include switchable water circuits to hasten warm-up, and a total of eight scavenging pumps that reduce pressure and scavenging losses by around 50 per cent.
There’s no direct injection, though - for now, at least. “We looked at it,” Reggiani revealed, “but there are issues with back pressure [in the exhaust system] and how you manage that while still achieving maximum power. Multi-point injection is a simple solution that avoids an additional device to reduce particulates, so we’ve gone with that. But DI is something we could look at again in the future.”
Having ruled out a dual-clutch unit, Lambo has gone with another single-clutch automated manual for the next Murciélago. “It’s the most emotional system to use,” said CEO Stephan Winkelmann, who has called the new unit - developed in conjunction with Graziano - “a sequential race gearbox in a roadgoing car”.
The new gearbox (called ISR, for Independent Shifting Rods) is a seven-speed, 70kg unit with a twin-plate, 235mm clutch. It uses four shifting rods to run the shift process “virtually in parallel”; times fall to as little as 50ms, around 40 per cent faster than with the Gallardo’s e-gear system.
The gearbox will run in three modes: Strada, which will offer a fully automatic shift if desired, the more focused Sport and the extreme Corsa, which will also include launch control.
The differential set-up includes a computer-controlled unit at the front, instead of the old viscous coupling, a Haldex4-based centre diff and a rear unit that’s integrated into the casting of the engine.
Lamborghini claims the new gearbox is tidier and smaller than the old transmission, a factor that should free up cabin space in the Murciélago’s replacement. The firm also says almost all customers want this set-up - and as a result, the car will not be available with a regular manual.