GM's Latest - The 2009 Corvette ZR1 and it's Supercharged LS9 Small-Block V-8.

The 2009 Corvette ZR1 will be moved by the most powerful production engine ever built by GM.

Courtesy of GM Feb 3, 2008 0 Comment(s)

Water pump: To compensate for the heavier load generated by thesupercharger drive system, an LS9-specific water pump with increasedbearing capacity is used.

Accessory drive system: In order to package the accessory drive systemin the Corvette's engine compartment, the supercharger drive wasintegrated into the main drive system. This required a wider 11-ribaccessory drive system to be used with the LS9 in order to support theload delivered by the supercharger.

Fuel system: The LS9 uses high-capacity 48-lb./hr. fuel injectors withcenter-feed fuel lines. The center feed system ensures even fuel flowbetween the cylinders with less noise. In order to ensure fuel systemperformance during low speed operation as well as under the extremeperformance requirements of wide open throttle (WOT), a dual pressurefuel system was developed. This system operates at 250 kPa at idle andlow speed, and ratchets up to 600 kPa at higher-speed and WOTconditions.

Throttle body: An 87-mm, single-bore throttle body is used to draw airinto the engine. It is electronically controlled.

Rocker covers / ignition coils: Unique rocker covers with new,direct-mount ignition coils are used. Other Gen IV engines, such as theLS3, feature coil packs mounted to a bracket. The LS9's direct-mountedcoils offer a cleaner appearance and a shorter lead between the coil andspark plug.

Beauty cover: A special engine cover is attached to the top of the LS9.It surrounds the intercooler, which is visible through a hood window,accenting the supercharger while simultaneously reducing noise. Thecover has "LS9 SUPERCHARGED" script on the left and right sides, alongwith a debossed Corvette crossed flags emblem on the front.

New six-speed manual transmission

The Corvette ZR1's LS9 engine is backed by a Tremec TR6060 six-speedmanual transmission, with a twin-disc clutch system. It is based on theproven T56 six-speed, but upgraded to handle the LS9's torque output anddelivers improved shift quality

The twin-disc clutch system provides exceptional clamping power, whilemaintaining an easy clutch effort. The system employs a pair of 260-mmdiscs, which spreads out the engine's torque load over a wider area,enabling tremendous clamping power to channel the LS9's torque. It alsodissipates heat better and extends the clutch life (in normal driving).

Thanks to comparatively small plates, the twin-disc system enablessimilar disc inertia to the Corvette Z06, which has a 290-mm single-discsystem, contributing to low shift effort and providing exceptionallysmooth engagement and light pedal effort. In fact, the more powerful ZR1has a pedal effort similar to the Z06.

ZR1-specific gearing in the transmission provides a steep first-gearratio that helps launch the car. The car's top speed is achieved insixth gear - a change from the fifth-gear top-speed run-outs in themanual-transmission Corvette and Corvette Z06. The gears also aredesigned to balance performance with refinement. The angles of the gearteeth are optimized to provide both strength and quietness.




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