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VORTEC 8100

The Vortec 8100 (L18) is essentially a new engine. Nearly 80 percent of its parts have been redesigned. Yet, its foundation is one of the most celebrated engine comonents in automotive history, GM's Big Block V8. The Big Block even competes against diesels n highly demanding marine and industrial applications - in essence giving Silverado and Sierra HD customers a lot more truck engine for the money than they realize.

The new Vortec 8100 shares its predecesor Vortec 7400's value and bore centers and bore diameter. But its stroke has been increased by 9.4 mm (.37 in) for a higher displacement and more power.

The Vortec 8100's 200,000-mile (322,000-km) durability testing includes rigors that no other gasoline engine in its class have been put through; they include running at wide-open throttle for 300 straight hours.

It's low maintenance design requires only normal oil and filter changes during the first 100,000 miles (160,000 km). Oil changes are based on actual need. The Powertrain Control Module records engine temperature and length of operation at a given temperature, the indicates the need for an oil change with an easy-to-read "Change Engine Oil" LCD message in the Driver Message Center. The driver is also alerted to "Check Engine Oil Level," when necessary.

The Vortec 8100's rigid cylinder block uses four-bolt main bearings to optimize crankshaft rigidity. The nodular iron crank is internally balanced and counterweighted to minimize internal stresses and bearing loads. The bearings are produced with a new alloy (A260) that increases their life and eliminates the use of environmentally hazardous cadmium. An elastic material called Vamac is used in place of rubber to suppot the crankshaft's torsional rigidity: it increases both damping capability and durability. A change in the firing order (to 1-8-7-2-6-5-4-3) reduces main bearing wear and stress on the crank by seven percent.






Type: 8.1L V8
Displacement: 496 cid (8128 cc)
Compression Ratio: 9.1:1
Valve Configuration: Pushrod Actuated Overhead Canted Valves (2 valves per cylinder)
Valve Lifters: Hydraulic Roller
Bore x Stroke: 4.25 x 4.37 in (107.95 x 111.00 mm)
Main Bearing Caps: 4-Bolt Cast Iron
Intake Manifold: Factory-installed PFI Manifold
Firing Order: 1-8-7-2-6-5-4-3
Oil Pan Capacity: 8 qt
Fuel Type: Gasoline (unleaded)
Fuel System: Port Fuel Injection
Engine Rotation: Clockwise (facing front)
Spark Plugs: Platinum tipped (1.5-mm gap)
Emission Controls: Internal PCV oriface system
Paint Protection: Component-Painted
Shipping Weight: 740.75 lb (336 kg)
Horsepower: 420 hp @ 5000 rpm
Torque: 505 lb-ft @ 4000 rpm