GM / Chevy LY2 Vortec 4800

GM / Chevy LY2The GM / Chevy LY2 (VIN – “C”) is a 4.8 l (293 cu.in.) natural aspirated V8 90° four-stroke gasoline engine from a Generation IV small-block V8 truck engine series. The engine was manufactured from 2007 to 2009.

The GM LY2 Vortec 4800 features a V8 90° cast-iron cylinder block with a five-bearings crankshaft, two aluminum heads, a single one-piece cast camshaft, and two valves per cylinder (16 in total). The LY2 used a sequential multi-port fuel injection system and 84.0 mm (3.31 in) throttle body with electronic (Drive-by-Wire) control and coil-near-plugs ignition system with iridium spark plugs and low resistance spark plug wires

The compression ratio rating is 9.1:1. Cylinder bore and piston stroke are 96.0 mm (3.78 in) and 83.0 mm (3.27 in), respectively. The engine produced from 264 PS (194 kW; 260 HP) to 300 PS (220 kW; 295 HP). The maximum torque is from 400 N·m (40.8 kg·m, 294.8 ft·lb) to 414 N·m (42.2 kg·m, 305.1 ft·lb).

General information

Engine Specifications
Engine code GM / Chevy LY2 Vortec 4800
Layout Four stroke, V8
Fuel type Gasoline (petrol)
Production 2007-2009
Displacement 4.8 L, (293 cu in)
Fuel system Sequential fuel injection
Power adder None
Power output From 264 PS (194 kW; 260 HP)
to 300 PS (220 kW; 295 HP)
Torque output From 400 N·m (40.8 kg·m, 294.8 ft·lb)
to 414 N·m (42.2 kg·m, 305.1 ft·lb)
Firing order 1-8-7-2-6-5-4-3
Dimensions (L x W x H):
Weight

Cylinder block

The LY2 has a cast-iron cylinder block with a five-bearings crankshaft supported system. The crankshaft journal diameter is 65.0 mm (2.55 in), the crankpin diameter is 53.3 mm (2.09 in). The crankshaft is a cast nodular iron.

The cylinder bore is 96.0 mm (3.78 in), piston stroke is 83.0 mm (3.27 in) and the compression ratio rating is 9.1:1. The GM LY2 motor has two compression and one oil control rings. The pistons are cast aluminum. The piston pins are chromium steel and are a full-floating design. The connecting rods are powdered metal.

Cylinder block
Cylinder block alloy Cast-iron
Compression ratio: 9.1:1
Cylinder bore: 96.0 mm (3.78 in)
Piston stroke: 83.0 mm (3.27 in)
Number of piston rings (compression / oil): 2 / 1
Number of main bearings: 5
Cylinder inner diameter (standard): 96.000-96.018 mm (3.7795-3.7802 in)
Piston skirt diameter (standard): 96.000 mm (3.7795 in)
Piston pin outer diameter: 23.952-23.955 mm (0.943-0.9431 in)
Piston ring side clearance: Top 0.040-0.085 mm (0.0016-0.0033 in)
Second 0.040-0.078 mm (0.0016-0.0031 in)
Oil 0.012-0.200 mm (0.0005-0.0079 in)
Piston ring end gap: Top 0.23-0.44 mm (0.0091-0.0173 in)
Second 0.44-0.70 mm (0.0173-0.0276 in)
Oil 0.18-0.75 mm (0.0071-0.0295 in)
Connecting rod small end diameter 24.000 mm (0.9449 in)
Connecting rod big end diameter: 56.505-56.525 mm (2.2246-2.2254 in)
Crankshaft main journal diameter: 64.993-65.007 mm (2.5588-2.5593 in)
Crankpin diameter: 53.318-53.338 mm (2.0991-2.0999 in)

Cylinder head

The cylinder heads are made of strong, light aluminum alloy which gives it good cooling efficiency. The camshaft is driven by a single chain. The timing chain transmits the rotational movement from the crankshaft to the camshafts. Valves are operated via pedestal mounting rocker arms.

Cylinder head
Block head alloy Aluminium
Valve Arrangement: OHV, chain drive
Valves: 16 (2 valves per cylinder)
Intake valve timing: 191°
Exhaust valve timing: 190°
Valve head diameter: INTAKE
EXHAUST
Valve length: INTAKE
EXHAUST
Valve stem diameter: INTAKE 7.955-7.976 mm (0.3132-0.314 in)
EXHAUST 7.955-7.976 mm (0.3132-0.314 in)
Valve spring free length: INTAKE 52.9 mm (2.0827 in)
EXHAUST 52.9 mm (2.0827 in)
Camshaft lobe lift: INTAKE 7.2 mm (0.2835 in)
EXHAUST 7.2 mm (0.2835 in)
Camshaft journal diameter: 54.99-55.04 mm (2.165-2.1669 in)

Head tightening procedure and torque specs:
M8 bolts:

  • 30 Nm (3.06 kg·m; 22.14 ft·lb)

M11 bolts:

  • Step 1: 30 Nm (3.06 kg·m; 22.14 ft·lb)
  • Step 2: Turn all bolts: 90°
  • Step 3: Turn all bolts: 70°

Maintenance data

Compression pressure
Standard 12.5 kg/m2 / 300 rpm
Minimun 7.0 kg/m2 / 300 rpm
Compression differential limit between cylinders 1.0 kg/m2 (15 psi) / 300 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles) up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil 5W-30, 10W-30
Oil type API
Engine oil capacity (Refill capacity) Without oil filter: 5.2 L (5.5 US. qt, 4.6 Imp. qt.)
With oil filter: 5.7 L (6.0 US. qt, 5.00 Imp. qt.)
Oil change interval, km (miles) 12,000 km (7,500 miles)
Oil Pressure 41 kPa at 1,000 rpm
124 kPa at 2,000 rpm
165 kPa at 4,000 rpm
Ignition system
Spark plug AC Delco: 41-985 Iridium
Spark plug gap 1.01 mm (0.0398 in)

Vehicle applications

Model Years Produced
Chevrolet Express 2008–2009
Chevrolet Silverado 2007–2009
Chevrolet Tahoe 2007–2009
GMC Sierra 2007–2009
GMC Yukon 2007–2009
GMC Savana 2008–2009
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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