638 Hp from the Supercharged LS9 V-8
Dubai, United Arab Emirates - When it was introduced at the North American International Auto Show in Detroit earlier this year, the 2009 Chevrolet Corvette ZR1's power was estimated at 100 horsepower for each of its 6.2 litres of displacement. GM Powertrain has completed SAE certification of the ZR1's supercharged LS9 V-8 and the results exceed the estimate: 638 horsepower and 819 Nm of torque.
The LS9's output is nearly 103 horses per litre or just about 1.7 horses for each of the engine's 376 cubic inches. It is unquestionably the most powerful automotive production engine ever manufactured by General Motors and enables the Corvette ZR1 to achieve a top speed of more than 322 km/h.
"One of the most amazing things about the Corvette ZR1 is the level of refinement that our designers and engineers have attained. Even with all that power, this car has road manners that will allow our customers to enjoy it on the streets as a daily driver, and on the track," said Chevrolet General Manager Ed Peper.
The Corvette ZR1 goes on sale this summer. Its 638-hp supercharged engine is complemented in the chassis by heavy-duty components not offered in any other model, including a six-speed manual transmission with race-hardened gears and dual-disc clutch technology that delivers exceptional clamping power and lower inertia, as well as strengthened axle components.
Fuel economy testing has not been completed, but engineers are confident the ZR1 will be the most fuel-efficient 600-plus-horsepower car on the market.
The LS9 engine is hand-built by specially trained technicians at GM's Performance Build Centre in Wixom, Mich. It is a unique, small-volume engine production facility that also builds the Chevrolet Corvette Z06's LS7 engine and other high-performance GM production engines.
"Developing the LS9 involved more than simply striving for a great horsepower number. Endurance and reliability testing have shown the engine to be robust and low-maintenance, just like other engines in the small-block family," said Sam Winegarden, executive director, engine engineering for GM Powertrain. "That it is distinguished as the most powerful engine ever from General Motors is a source of immense pride among everyone involved with the LS9."
Supercharged aspiration
The key enabler of the LS9's performance is the industry's first production application of a new, positive-displacement Roots-type supercharger that has a unique four-lobe rotor design. Its design promotes quieter and more efficient performance, while the large, 2.3-litre displacement ensures adequate air volume at high rpm. Maximum boost pressure is 10.5 psi. It is teamed with an integrated charge cooling system that reduces inlet air temperature for maximum performance.
"The combination of large displacement and the new, four-rotor design broadens the effective range of the supercharger, allowing the engine to make more power at lower rpm and sustain it throughout the power band," said Winegarden. "The low-end torque is tremendous and the high-rpm charge from the supercharger is simply amazing."
A raised hood provides adequate clearance for the LS9, while a polycarbonate window in the hood provides a view of the engine beneath it.
LS9 details
The LS9 features many unique design and manufacturing details that support its high-performance nature. They include:
- Aluminium cylinder block with iron cylinder liners that are finish-bored and honed with a deck plate installed
- Forged steel crankshaft with a nine-bolt flange
- Titanium connecting rods and forged aluminium pistons
- Stronger, rotocast cylinder heads with 55 mm titanium intake valves and 40.4 mm hollow-stem, sodium-filled exhaust valves
- Camshaft with 14.1 mm lift for excellent idle and low-speed driving qualities
- A dry-sump oiling system with 9.9 litres capacity
- Integrated oil cooler and piston-cooling oil squirters
- Intercooler cover visible through the hood window that features ZR1-unique blue accents and "LS9 SUPERCHARGED" embossed on the left and right sides
-Ends-
About Chevrolet:
Chevrolet is the largest division of General Motors. Founded in 1911, Chevrolet fulfills the transportation needs of millions of people daily around the world.
In the Middle East, Chevrolet has a strong heritage stretching back more than eight decades. Today Chevrolet brings the most comprehensive range of value vehicles to customers across the region, offering superlative excitement, strong personality, value for money, safety and security from a brand that has long been a trusted partner in the region.
Chevrolet boasts the widest range of passenger cars and commercial vehicles in the Middle East, from the cost effective entry-level Spark, Aveo, Optra and Epica models to the iconic Corvette, and the full-size Caprice and Lumina sedans. Chevrolet also offers exciting and capable SUVs from the compact Captiva and mid-size TrailBlazer, to the fullsize Tahoe and Suburban, the Avalanche and Silverado pickups, the Uplander van, as well as chassis for commercial applications.
About GM
General Motors Corp. (NYSE: GM), the world's largest automaker, has been the annual global industry sales leader for 77 years. Founded in 1908, GM today employs about 266,000 people around the world. With global headquarters in Detroit, GM manufactures its cars and trucks in 35 countries. In 2007, nearly 9.37 million GM cars and trucks were sold globally under the following brands: Buick, Cadillac, Chevrolet, GMC, GM Daewoo, Holden, HUMMER, Opel, Pontiac, Saab, Saturn, Vauxhall, and Wuling. GM's OnStar subsidiary is the industry leader in vehicle safety, security and information services.
In the Middle East since the 1920s, GM's vehicle brands sold in the region are Cadillac, Chevrolet, GMC, HUMMER and Saab supported by a unique set of customer-focused services. GM parts and accessories are sold under the GM Parts and ACDelco brands. The regional office in Dubai covers the company's operations in Bahrain, Iraq, Jordan, Kuwait, Lebanon, Oman, Qatar, Saudi Arabia, Syria, UAE and Yemen. In 2007, GM sold 135,894 vehicles in the Middle East.
For more media material, please visit GM's global media website media.gm.com where you link to various country sites including the Middle East media website http://media.gm.com/me/gm/en/ . More information on GM and its products can be found on the company's consumer websites www.gm.com and www.gmarabia.com.
On 16th September 2008, General Motors will celebrate its 100th birthday. A series of activities and initiatives will take place during the year, under the banner of GMnext, to showcase the company's accomplishments and vision for the future. For more details on GM's centennial, log on to www.gmnext.com
For more information:
Saada Hammad
Communications and Public Relations Manager
General Motors Middle East
Tel (+9714) 3143350
E-mail saada.hammad@gm.com
© Press Release 2008
