Generation: C5
Year: 1999
VIN: C5R-002
Race Numbers: 4
Ownership: General Motors Corp / Pratt & Miller (1999 to __)
Sponsors: GM Goodwrench GMAC GM-UAW GM Performance Parts
Drivers: Andy Pilgrim; John Heinricy; Scott sharp; Kelly Collins; Franck Freon
Status:

Original Color: yellow
Tires/Wheels: WHEELS / TIRES: Wheels BBS (1999 to 2003) - OZ (2004-05) 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, with steel hydroformed chassis rails. 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 initial C5-R factory race suspension was based on the stock Corvette's front and rear aluminum subframes, stock front upper and lower control arms, and stock rear lower control arms. The standard rear upper control arms were fabricated by Pratt & Miller to clear the Alcon aluminum racing brakes. The stock C5's 104.5-in. wheelbase stretched to 104.7 in. Body 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. This chassis configuration was significantly updated with the introduction of serial numbers #003 and #004.
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, making approximately 600 HP at 7200 rpm with 495 ft.-lb. of torque at 5600 rpm. This compares to 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. By the second last race of the season, at Laguna Seca, a new 427 engine was introduced, using a new casting but still based on production 346 LS1. The engine continued to evolve throughout the racing program. However, some of the changes to the stock engine continued through all engine variants. 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: 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.
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URL: 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: Race-by-race changes by David Palmeter: 1999 Racing Season: •Sebring 12 Hr – Chassis # 002 entered with same body and engine as chassis # 001: runs as # 4 with the silver and black checkers paint scheme; DNF •Sears Point, 001 - new hood, roof scoop gone, 366 engine •Atlanta, 002 - same as Sears Point (Sonoma) •Laguna Seca, 002 - 427 engine (new casting but still based on production 346 LS1) •Las Vegas, 001 - same as Laguna Seca 2000 Racing Season •Daytona, 002 - Revised nose: "creased" air dam, more splitter surface, more undercut. Possible cleaner new rear flare •Car # 4 finished 10th in GTO class at the 2000 Daytona 24 HR race (DNF). •Car # 4 runs same engine and body; finishes 5th in GTS class at Sebring 2000 •Le Mans, 002 - same body and engine - final race for these chassis
Notes/Race History: RACE HISTORY: SUMMARY: GM’s official entry to racing was contracted to the Pratt & Miller group which has generally been responsible to campaign a two car team for the entire period, from 1999 to the present. There have been only one or two exceptions. The first being in 1999 to 2000 when the Riley and Scott team from Indianapolis was asked to run one of the two official GM entries, through to the C5R’s first efforts at Le Mans in 2000 and later, with C6R when three car entries were occasionally presented. Beginning with the Sebring race of 1999, two cars were entered. Chassis # 001 and #002 ran from 1999 through to (and including) Le Mans in June 2000. One of the cars (#002) was campaigned by Riley and Scott, up to and including the Le Mans 2000 event ?????
Registry ID Number: 493

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1999 - Car # 4 at Sebring - Richard Martin