LT5 Engine Specifications
GENERAL ENGINE INFO
YEARS 1990-92 1993-1995
SAE Net Power 375 hp @ 6,000 rpm 405 hp @ 5,800 rpm
SAE Net Torque 370 ft lbs @ 4800 rpm 385 ft lbs @ 4800 rpm
Compression Ratio 11:1 Same
Bore/Stroke 99 x 93 mm (3.90 in. x 3.66 in.) Same
Firing Order 1,8,4,3,6,5,7,2 Same
Bore/Stroke Ratio 1.07:1 Same

CYLINDER CASE
YEARS 1990-92 1993-1995
Material Aluminum casting Same
Descriptions Open deck 2-bolt fastening per bearing panel Open deck 4-bolt fastening per bearing panel
Bore Spacing 111.76 mm (4.40 in.) Same
Deck Height 229.24 mm (9.03 in.) Same
Supplier Denison Foundry GM Bedford

CRANKCASE
YEARS 1990-92 1993-1995
Material Aluminum, with cast-in nodular cast iron bearing inserts Same
Description Ladder frame 2-bolt fastening per bearing panel Ladder frame 4-bolt fastening per bearing panel

CYLINDER LINER
YEARS 1990-92 1993-1995
Material Forged aluminum Nikasil coated Same
Supplier Mahle Same

MAIN BEARINGS
YEARS 1990-92 1993-1995
Material Lead-indium overlay Same
Description Cast leaded bronze steel-backed Same
Supplier Vandervell Same

INLET VALVES
YEARS 1990-92 1993-1995
Material VMS-648 Flash chrome Same
Overall Length 103.17 mm (4.06 in.) 102.67 mm (4.04 in.)
Head Diameter 39 mm (1.54 in.) Same
Angle Seat/Face 44 degree/45 degree Same
Stem Diameter 7.96 mm (0.314 in.) Same
Valve Angle 10 degree Same
Valve Seat Diameter 37.2 mm (1.46 in.) gauge diameter Same
Lift 9.9 mm Same
Supplier TRW Same

EXHAUST VALVE
YEARS 1990-92 1993-1995
Material VMS-478 Seat:VMS-590 Chrome flashed VMS-478 Seat:VMS-637 Chrome flashed
Overall Length 103.47 mm (4.07 in.) 102.97 mm (4.05 in.)
Head Diameter 35.2 mm (1.39 in.) Same
Angle Seat/Face 44 degree/45 degree Same
Stem Diameter 7.96 mm (0.314 in.) Same
Valve Angle 12 degree Same
Valve Seat Diameter 33 mm (1.30 in.) gauge diameter Same
Lift 9.9 mm (0.39 in.) Same
Supplier TRW Same

VALVE SPRINGS
YEARS 1990-92 1993-1995
Type Inner & outer opposed winding Same
Load-Closed 160-313 N (36-70 lbs.) Same
Load-Open 350-696 N (78-157 lbs.) Same
Supplier Tempered Spring Same

VALVE LIFTERS
YEARS 1990-92 1993-1995
Material Alloy cast iron Same
Type Hydraulic Same
Supplier AC Rochester Same

CYLINDER HEAD
YEARS 1990-92 1993-1995
Material Aluminum Same
Description Cross flow, fast burn, pent roof combustion chamber Same
Combustion Chamber Volume 40 cc Same
Gasket Composition (Goetze) Same
Supplier Birmal 1995 1/2 model year-A.L. Dunn (design changes 1993-95)

FLYWHEEL
YEARS 1990-92 1993-1995
Material Cast iron Same
Description Dual mass Same
Supplier LUK Same

OIL PUMP
YEARS 1990-92 1993-1995
Type Duo-centric-crankshaft driven Same
Pressure 50-60 psi Same
Temp Regulation Thermostat-Open-95 degree C Fully open-130 degree C Same
Capacity Idle-1.6 gpm 7,000 rpm-9.1 gpm Same
Supplier Presta SHW (minor design change, 1993-95 model years)

OIL PAN
YEARS 1990-92 1993-1995
Material Aluminum Same
Capacity 9.6 qts. Same
Supplier Stahl Specialty Stahl Specialty (design changed, 1993-95 model years)

PLENUM
YEARS 1990-92 1993-1995
Material Aluminum Same
Supplier Stahl Specialty Stahl Specialty (design changed, 1993-95 model years)

CRANKSHAFT
YEARS 1990-92 1993-1995
Material Nitrided Same
Counterweights 6 Same
Crankpin Journal 53.33 mm (2.10 in.) Same
Crankpin Splay None Same
Thrust Position Bearing No. 3 Same
Main Journal Diameter 70.00 mm (2.76 in.) Same
Supplier Shardlow Same

CONNECTING ROD
YEARS 1990-92 1993-1995
Material Forged steel Same
Length (CTR distance) 145.8 mm (5.74 in.) Same
Supplier Albon Engineering Albon Engineering (rods lightened, 1993-95)

PISTON
YEARS 1990-92 1993-1995
Material Aluminum-cast Same
Description Expansion control-spherical bowl Same
Compression Height 36.5 mm (1.44 in.) Same
Supplier Mahle Mahle (piston strengthened, 1993-95)

PISTON RINGS
YEARS 1990-92 1993-1995
Top Compression Barrel-cast iron Plated-cast iron
Middle Compression Taper-cast iron Lapped-cast iron
Oil Control Cast iron-internal spring Lapped-cast iron-internal spring
Supplier Mahle (Goetze) Mahle (Goetze) (design revised, 1993-95)

PISTON PIN
YEARS 1990-92 1993-1995
Material Steel Same
Description Free Floating Same
Supplier Mahle Mahle (design revised, 1993-95)

LUBRICATION SYSTEM
YEARS 1990-92 1993-1995
Type Full flow. Temp regulated Same
Main and Con Rod Bearings Direct feed through center crank via cross drillings Same
Cam Bearings Forced through center cam Same
Piston Pins Splash Same
Cylinder Walls Splash Same
Total Capacity 12 1/2 qts Same

ACCESSORY DRIVE
YEARS 1990-92 1993-1995
Type Single poly "V" belt Same
Supplier Dayco Same

FUEL RAIL
YEARS 1990-92 1993-1995
Material Extruded aluminum-multech injectors Extruded aluminum-multech injectors (commonized injectors, 1993-95)
Supplier AC Rochester Same

INJECTOR HOUSINGS
YEARS 1990-92 1993-1995
Material Aluminum Same
Supplier Denison Stahl (minor design change, 1993-95)

IGNITION COILS
YEARS 1990-92 1993-1995
Description Four-direct fire Same
Supplier Delco Same

ALTERNATOR
YEARS 1990-92 1993-1995
Idle Output 50 amps Same
Max Output 120 amps Same
Supplier Delco Same

VALVE TRAIN
YEARS 1990-92 1993-1995
Description Direct acting Double overhead cam Same

CAMSHAFT DRIVE
YEARS 1990-92 1993-1995
Description Primary drive-silent chain- Secondary drive-duplex roller chain Same
Supplier Borg Warner Same

CHAIN TENSIONERS
YEARS 1990-92 1993-1995
Description Hydraulic Same
Supplier INA Same

CAMSHAFTS
YEARS 1990-92 1993-1995
Material Alloy cast iron Same
Base Circle 32.8 mm (1.291 in.) Same
Lobe Lift 9.9 mm (0.39 in.) Same
Supplier GM Bay City GM Bay City (design changes, 1993-95)

STARTER MOTOR
YEARS 1990-92 1993-1995
Type Gear reduction Same
Output 1.4 Kw Same
Supplier Delco Same

POWER STEERING PUMP
YEARS 1990-92 1993-1995
Type Engine mounted-reservoir Same
Supplier Saginaw Same

COOLING SYSTEM
YEARS 1990-92 1993-1995
Type Pressurized Same

RADIATOR
YEARS 1990-92 1993-1995
Core Thickness 1.34 in. Same
Frontal Area 405 sq. in. Same
Radiator Cap 17 psi. Same
Thermostat Open 180 degree F Same
Fully Open 195 degree - 200 degree F Same
WATER PUMP
YEARS 1990-92 1993-1995
Type Centifugal Same
Capacity 12 gpm @ idle 85 gpm @ 7,000 rpm Same
Supplier Ace (Casting)

Same

The Engine Specifications shown here were taken from a book titled "The Heart of the Beast" by Anthony Young, published by "The Kutztown Publishing Company, Inc.

 

©2017 ZR-1 NET Registry   |  Privacy Statement