2013 Chevrolet Camaro ZL1 Convertible Exterior Scenes
2012 Camaro ZL1 Features Technically Advanced 6.2L Supercharged V-8
CHICAGO -- The all-new, 2012 Chevrolet Camaro ZL1 is powered by the LSA 6.2L supercharged V-8 engine that produces an estimated 550 horsepower (410 kW) and 550 lb.-ft. of torque (745 Nm).
The LSA is the most powerful engine ever offered in a Camaro, eclipsing even the original ZL1 engine from 1969 that inspired the name of the new, maximum-performance model. Built on GM's legendary small-block V-8 architecture, it features an intercooled supercharger system, premium heat-resistant aluminum cylinder heads and other details designed to ensure its exceptional performance is delivered with smoothness and refinement.
"The LSA is the ultimate engine for the ultimate Camaro," said John Rydzewski, assistant chief engineer for small-block engines. "It has a broad power band that matches the Camaro ZL1's performance capabilities at every notch on the tachometer."
Components and design elements that contribute to the LSA's performance include:
■Balanced, lightweight reciprocating assembly
■High-strength hypereutectic pistons
■Sixth-generation Eaton supercharger with four-lobe rotors
■Center-feed fuel system
■Piston oil squirters.
A Tremec TR6060 six-speed manual transmission is matched with the LSA. It uses a 240-mm dual-mass flywheel matched with a 240-mm twin-disc clutch system to provide excellent shift smoothness.
Compared to the Cadillac application, the LSA used in the Camaro features the following unique components and details:
■Black intercooler housing with unique heat exchanger and plumbing to accommodate the Camaro engine compartment
■Cast stainless steel exhaust manifolds for enhanced thermal management
■Camaro-specific oil pan
■Revised accessory drive with unique alternator and air conditioning compressor
■Idler pulley in place of the conventional power steering pump pulley, because of the use of electric power steering
■Special engine cover in red.
Supercharged power delivery
The LSA engine's sixth-generation Eaton supercharger, with high-helix, four-lobe rotors, enables a broad range of power through the rpm band, giving the engine great low-end torque and excellent horsepower at higher rpm.
"The design of the supercharger's rotating internal components extends its effective range, giving the engine a wide, flat power band that is usable at all rpm levels," said Rydzewski, assistant chief engineer. "Whether at low speeds or on the highway, the feeling of power is instant, strong and sustained."
Heavy-duty and lightweight reciprocating components support the engine's high-rpm, supercharged performance. The parts are housed in an aluminum cylinder block that features nodular iron, six-bolt main caps. Cast iron cylinder liners -- measuring 4.06 inches (103.25 mm) in bore diameter -- are inserted in the aluminum block and they are finish-bored and honed with a deck plate installed. The deck plate simulates the pressure and minute dimensional variances applied to the block when the cylinder heads are installed, ensuring a higher degree of accuracy that promotes maximum cylinder head sealing, piston ring fit and overall engine performance.
Nestled inside the LSA's deep-skirted cylinder block is a forged steel crankshaft that delivers a 3.62-inch (92 mm) stroke. It features an eight-bolt flange -- the outer face of the crankshaft on which the flywheel is mounted -- that provides enhanced clamping strength. Other non-supercharged GM 6.2L engines have a six-bolt flange. A torsional damper mounted to the front of the crankshaft features a keyway and friction washer, which is designed to support the engine's high loads.
Connected to the crankshaft is a set of lightweight powder-metal connecting rods and hypereutectic pistons, which, when combined with the cylinder heads, delivers a 9.1:1 compression ratio. The alloy of the pistons was selected for its strength and heat resistance properties, while the cast design provides inherent quieting advantages over other piston materials, such as forged aluminum.
High-flow cylinder heads based on GM's proven L92 design channel incoming air into the combustion chambers. They are made with a premium A356T6 alloy that offers excellent heat resistance, particularly in the bridge area of the cylinder head, between the intake and exhaust valves. Additionally, each head is manufactured with a roto-casting method.
Also known as spin casting, the roto-casting process involves pouring the molten alloy into a rotating mold, for a more even distribution of the material that virtually eliminates porosity -- air bubbles or pockets trapped in the casting -- for a stronger finished product.