Post by Aurora40 on Nov 3, 2010 6:48:33 GMT -6
4.0L V8 (L47) Car Engine
2003 Model Year Summary
Forged Steel Crankshaft
Polymer-Coated Pistons
FULL DESCRIPTIONS OF NEW OR CHANGED FEATURES
FORGED STEEL CRANKSHAFT
The 4.0L (L47) is equipped with a forged steel crankshaft, replacing the cast iron crank used through 2002. The crankshaft was revised to further improve the Aurora’s world-class noise, vibration and harshness control (NVH) characteristics. Steel is inherently stiffer than cast iron, thereby reducing vibration from the engine’s largest moving part--the crankshaft. Steel also generates and broadcasts less noise than cast iron, enhancing the Aurora’s credentials as one of the smoothest, quietest V8s extant. Finally, the steel crankshaft weighs slightly less, bringing secondary benefits beyond better NVH control. There is less reciprocating mass in the engine, meaning less inertia and more fuel-efficient operation.
POLYMER-COATED PISTONS
Pistons in the 4.0L L47 are now finished with Grafal polymer coating. The polymer limits bore scuffing, or abrasion of the cylinder wall over time from the piston’s up-down motion. The coating also dampens noise generated by the piston’s movement within the cylinder. The result for the customer is less engine wear, improved durability and quieter operation.
OVERVIEW
The Aurora V8 was developed exclusively for Oldsmobile and launched in the 1995 Aurora. It's part of GM Powertrain's Premium V family, noted for advanced technology, smoothness and class leading output. After a one-year hiatus, while the Aurora was redesigned for 2001, the 4.0L L47 was thoroughly re-engineered from top to bottom to make it cleaner, quieter and even more fuel efficient. The result was better noise, vibration and harshness control, fewer emissions and less scheduled maintenance. Like the other Premium V engines, the 4.0L remains at the technological forefront.
In short, with it’s 4.0L L47, the Oldsmobile Aurora delivers refined performance at fewer dollars per horsepower than its key competitors.[/quote]
2003 Model Year Summary
Forged Steel Crankshaft
Polymer-Coated Pistons
FULL DESCRIPTIONS OF NEW OR CHANGED FEATURES
FORGED STEEL CRANKSHAFT
The 4.0L (L47) is equipped with a forged steel crankshaft, replacing the cast iron crank used through 2002. The crankshaft was revised to further improve the Aurora’s world-class noise, vibration and harshness control (NVH) characteristics. Steel is inherently stiffer than cast iron, thereby reducing vibration from the engine’s largest moving part--the crankshaft. Steel also generates and broadcasts less noise than cast iron, enhancing the Aurora’s credentials as one of the smoothest, quietest V8s extant. Finally, the steel crankshaft weighs slightly less, bringing secondary benefits beyond better NVH control. There is less reciprocating mass in the engine, meaning less inertia and more fuel-efficient operation.
POLYMER-COATED PISTONS
Pistons in the 4.0L L47 are now finished with Grafal polymer coating. The polymer limits bore scuffing, or abrasion of the cylinder wall over time from the piston’s up-down motion. The coating also dampens noise generated by the piston’s movement within the cylinder. The result for the customer is less engine wear, improved durability and quieter operation.
OVERVIEW
The Aurora V8 was developed exclusively for Oldsmobile and launched in the 1995 Aurora. It's part of GM Powertrain's Premium V family, noted for advanced technology, smoothness and class leading output. After a one-year hiatus, while the Aurora was redesigned for 2001, the 4.0L L47 was thoroughly re-engineered from top to bottom to make it cleaner, quieter and even more fuel efficient. The result was better noise, vibration and harshness control, fewer emissions and less scheduled maintenance. Like the other Premium V engines, the 4.0L remains at the technological forefront.
In short, with it’s 4.0L L47, the Oldsmobile Aurora delivers refined performance at fewer dollars per horsepower than its key competitors.[/quote]
