The LS9 while never officially acknowledged was almost a twin turbo. During the development of the ZR1 engine (Blue Devil), later known as the LS9, GM ran into a small problem with its turbos. They decided the packaging was an issue trying to get the turbos to fit in the confined space under the hood of the C6. Part of this stemmed from the test mule burning up on Milford proofing grounds.
GM's LS9 V8 Supercharged Aluminum-Block Engine
Info courtesy of GM
The ZR1 (very limited availability) is powered by a 6.2 Liter aluminum-block V8 boosted by an Eaton® TVS™ (Twin Vortices Series) supercharger for a total power output of 638 hp at 6500 rpm and 604 lb.-ft. of torque at 3800 rpm. It is the most powerful motor ever to occupy the engine bay of a General Motors production car.
The supercharger features four lobes instead of the usual three for higher power and efficiency. It also features an intercooler to cool down the air/fuel charge for more power. In addition, nozzles squirt cooling oil into the underside of each piston.
The engine also features a dual-pressure fuel injection system for peak performance during multiple operating conditions.
Like the LS7 engine in the Z06, the LS9 features titanium connecting rods and exhaust valves as well as a dry-sump oil system with a larger capacity reservoir − now 10.5 quarts. The LS9 is hand-assembled at the GM Performance Build Center in Wixom, Mich.
Displacement (cu in / cc):
376 / 6162
Bore & stroke (in / mm):
4.06 x 3.62 / 103.25 x 92
Cylinder head material:
overhead valve, 2 valves per cylinder
SFI (sequential fuel injection)
Horsepower / kW:
638 / 475
Torque (lb-ft / Nm):
604 / 835
EPA estimated fuel economy:
The dry-sump oil systems on the Z06 LS7 and ZR1 LS9 engines prevent oil starvation on high-g corners or under heavy braking. The system uses an additional oil reservoir separate from the crankcase and pumps oil through the engine to ensure proper lubrication under high-performance situations. Oil capacity has been increased to 10.5 quarts for 2009
ZR1 Eaton supercharger details
Courtesy of Autoblog Video
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