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Generation: C5 Year: 1998 VIN: homolgation Race Numbers: Ownership: General Motors Corporation Sponsors: General Motors Corportation Drivers: Status: The car currently designated as the C5R homologation car is owned by General Motors and was been on display at the National Corvette Museum for several years. It has now been moved to the GM Heritage Center in Sterling Heights (MI). Original Color: silver Tires/Wheels: WHEELS / TIRES: Wheels BBS (1999 to 2003) Front - 18” dia. x 12.5” wide Rear - 18” dia. x 13” wide Tires: Goodyear Racing Eagles (1999 to 2004) CHASSIS / DRIVELINE: Pratt & Miller started 18 months prior with a completely stock C5 Corvette. They tore it down to its most basic components, and built it back up into a pure race car, slightly longer, lower and wider than a production C5. The C5-R factory race car is based on the stock Corvette's hydroformed frame rails, stock front and rear aluminum subframes, stock front upper and lower control arms, and stock rear lower control arms. The standard rear upper control arms are fabricated by Pratt & Miller to clear the Alcon aluminum racing brakes. The stock C5's 104.5-in. wheelbase stretched to 104.7 in. The length was stretched from 179.7 in. to 182.8 in. overall. The C5's stock height of 47.8 in. was lowered to 45.8, and the car's width was stretched from the stock 73.6 in. to 76.4 in. Engine: ENGINE: The C5-R started-out using a specially built 6.0-liter small-block V8, with a 4.125-in. bore and a 3.42-in. stroke for a total of 365 cu. in. The stock Corvette's aluminum small-block engine has a 3.90-in. bore and 3.62-in. stroke, with 10.5:1 compression, making 345 hp, while the race engine's output is at least 600 hp at 7200 rpm with 495 ft.-lb. of torque at 5600 rpm. The racing engine's block has larger water passages than a stock block. The reciprocating assembly is based on a Moldex billet crank, Carillo connecting rods and JE forged racing pistons. The cylinder heads have been altered extensively from stock, with 12.5:1 compression. The valvetrain uses a Competition Cams grind on a Chevrolet camshaft blank. Chevrolet chose Iskenderian lifters, Fox pushrods and Jesel 1.9:1 rocker arms to complete the valvetrain. The electronics package includes two Delphi Electronics engine computer-and-ignition systems and a complete Pi Research Systems 6 dashboard display, data acquisition and telemetry system that includes motion sensors on the front and rear suspensions. A Kinsler racing fuel-injection system, with elaborate cross-ram air horns and a composite airbox between the engine and the hood, breathes through an air intake behind the headlamps. An aluminum motor plate mounts to the front of the block, with a structural aluminum oil pan and a modified stock aluminum front subframe. The engine uses an external mechanical three-stage oil pump and dry-sump lubrication with the oil tank under the fuel tank. Driveline: TRANSMISSION: In the initial period, a five-speed Hewland racing transmission replaced the standard six-speed, mounted ahead of the differential. The balance of the drivetrain includes a 5.5-in. triple-disc Tilton carbon clutch, and a Pratt & Miller 3.11:1 rear end with Metalore axles and CV joints. Top: Interior: Condition: Refreshed for display purposes. URL: REFERENCES: David Palmeter web site at: http://palmeter.com Corvette Racing (US) at: http://corvetteracing.com Corvette Motorsport (Europe) at: http://corvettemotorsport.com Unique Characteristics: Modifications: Homolgation Car for ALMS C5R Notes/Race History: There were more than one developmental cars and several of these were also used as developmental and show cars in later years. As cars were deemed to have fulfilled their purpose, they would be turned to "show" cars for public appearances. Registry ID Number: 491 View Original Size  Homolgation car at museum - Wayne Ellwood |