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      04-25-2008, 10:23 AM   #1
not afraid to call it like I see it
Drives: 2006 325i
Join Date: Aug 2007
Location: right outside the gates of hell

Posts: 316
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ZR-1 Specs are out...638HP/604TQ

Official GM announcement snippets, for easy future reference:

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The 2009 Chevrolet Corvette ZR1 Powertrain has completed SAE certification of the ZR1's supercharged LS9 V-8 and the results exceed the estimate:

638 horsepower (476 kW) and
604 lb.-ft. of torque (819 Nm)

...output is nearly 103 horses per liter, or just about 1.7 horses for each of the engine's 376 cubic inches.

...unquestionably the most powerful automotive production engine ever manufactured by General Motors ... enables... top speed of more than 200 mph.

The Corvette ZR1 goes on sale this summer.

Fuel economy testing has not been completed... will be the most fuel-efficient 600-plus-horsepower car on the market.

...engine is hand-built by specially trained technicians at GM's Performance Build Center in Wixom, Mich.

Endurance and reliability testing have shown the engine to be robust and low-maintenance, just like other engines in the small-block family

The key enabler of the LS9's performance is the industry's first production application of a new, positive-displacement Roots-type supercharger... 2.3-liter displacement ensures adequate air volume at high rpm.

Maximum boost pressure is 10.5 psi (0.72 bar).

...integrated charge cooling system that reduces inlet air temperature for maximum performance.

LS9 details
Aluminum cylinder block
iron cylinder liners
finish-bored and honed with a deck plate installed
Forged steel crankshaft with a nine-bolt flange
Titanium connecting rods and forged aluminum pistons
Stronger, rotocast cylinder heads
2.16-inch (55 mm) titanium intake valves
1.59-inch (40.4 mm) hollow-stem, sodium-filled exhaust valves
Camshaft with 0.555-inch (14.1 mm) lift for excellent idle and low-speed driving qualities
A dry-sump oiling system with 10.5-quart (9.9 liters) capacity
Integrated oil cooler and piston-cooling oil squirters

Displacement (cu in / cc): 376 / 6162
Bore & stroke (in / mm): 4.06 x 3.62 / 103.25 x 92
Block material: cast aluminum
Cylinder head material: A356-T6 rotocast aluminum
Valvetrain: overhead valve, 2 valves per cylinder
Fuel delivery: SFI (sequential fuel injection)
Compression ratio: 9.1:1
Horsepower / kW: 638 / 476 @ 6500 rpm
Torque (lb-ft / Nm): 604 / 819 @ 3800 rpm
Fuel shut-off (rpm): 6600
Recommended fuel: premium required
Exhaust manifolds: stainless steel
Main bearing caps: forged steel
Crankshaft: forged steel
Camshaft: hollow steel; 0.555-in (14.1 mm) lift
Connecting rods: forged titanium
Valves: intake: titanium, exhaust: hollow steel
Valve lifters: hydraulic roller
Supercharger: R2300, four-lobe "Roots" type (2.3L)
Additional features:
piston oil-spray cooling; direct-mount ignition coils; 11-rib accessory drive
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