Imaj
15-09-2004, 11:53 AM
http://www.autointell-news.com/News-2001/September-2001/September-2001-2/GMXV8.jpg
http://www.acarplace.com/brands/gm/xv8-engine.html
the new XV8 concept engine, shown in the Opel Signum concept car. (Opel is GM's European division, and includes Vauxhall). The all-new engine provides the power of a full-size, high-end V8, but has greater fuel efficiency, the width of a V-6, and the length of a four-cylinder.
With an aluminum block and head, the 4.3 liter XV8 has three valves per cylinder with an air-assisted direct fuel injection system and two camshafts in the block. Power ratings are 300 horsepower (224 kW) and 295 lb-ft (400 Nm) of torque.
Other features include variable inlet systems (currently the main feature of Chrysler's Magnum engines), cam phasing, and displacement on demand (first seen on the ill-fated Cadillac 4-6-8 engines), variable inlet valve timing (common to Toyota and Honda engines), a narrow 75-degree bank angle, twin oil pumps, and an integrated air compressor. A GM spokesman said this combination was possible, in its best form, because of the engine's clean-sheet design: there was no need to compromise new features to co-exist with existing designs. That was especially important for direct injection.
The XV8's compression ratio of 10.75:1 is achieved with regular gasoline.
Key featuresThe all-aluminum 4.3-liter XV8 utilizes a unique three-valves-per-cylinder combustion chamber configuration, supporting the optimization of an air-assisted direct fuel injection system. The configuration features an industry first: two camshafts in the block. The XV8 produces 224 kW (300 horsepower) and 400 Nm (295 lb-ft) of torque.
The air-assisted direct injection gasoline system was developed by Orbital Engine Corp. of Australia, and is integrated into three-valve cylinder heads and dual cams in the block. The three valve system (two inlet valves, one exhaust) provides more room in the combustion chamber for optimal positioning of the injector and the spark plug, vertical and nearly central in the chamber - positioned as they would be in a Hemi engine.
Having two cams in the block rather than dual overhead cams provides considerable packaging benefits and combined with the direct injection fuel system, contributes to the XV8's outstanding performance numbers. The clean burning also means that after-combustion pollution control can be milder.
GM's Displacement on Demand technology allows the V8 to shut down half of its cylinders seamlessly at predetermined times to significantly reduce fuel consumption without hampering performance.
The unique twin oil pump design allows the engine to run Displacement on Demand at idle, since the system and cam phasing system have their own dedicated oil pump, which provides enough pressure to deactivate the cylinders at idle and reactivate them immediately upon throttle engagement.
This may be closer to reality then we think.
2 Fiats Are already slated to Recieve THE GM-FIAT 4.3 XV8
A Future Lancia Thesis, and the production Alfa Romeo Brera.
منقول من Cheers and Gears
http://www.cheersandgears.com/forums/index.php?showtopic=6082
الصراحة محرك خيالي :eek:
سلام :banana:
http://www.acarplace.com/brands/gm/xv8-engine.html
the new XV8 concept engine, shown in the Opel Signum concept car. (Opel is GM's European division, and includes Vauxhall). The all-new engine provides the power of a full-size, high-end V8, but has greater fuel efficiency, the width of a V-6, and the length of a four-cylinder.
With an aluminum block and head, the 4.3 liter XV8 has three valves per cylinder with an air-assisted direct fuel injection system and two camshafts in the block. Power ratings are 300 horsepower (224 kW) and 295 lb-ft (400 Nm) of torque.
Other features include variable inlet systems (currently the main feature of Chrysler's Magnum engines), cam phasing, and displacement on demand (first seen on the ill-fated Cadillac 4-6-8 engines), variable inlet valve timing (common to Toyota and Honda engines), a narrow 75-degree bank angle, twin oil pumps, and an integrated air compressor. A GM spokesman said this combination was possible, in its best form, because of the engine's clean-sheet design: there was no need to compromise new features to co-exist with existing designs. That was especially important for direct injection.
The XV8's compression ratio of 10.75:1 is achieved with regular gasoline.
Key featuresThe all-aluminum 4.3-liter XV8 utilizes a unique three-valves-per-cylinder combustion chamber configuration, supporting the optimization of an air-assisted direct fuel injection system. The configuration features an industry first: two camshafts in the block. The XV8 produces 224 kW (300 horsepower) and 400 Nm (295 lb-ft) of torque.
The air-assisted direct injection gasoline system was developed by Orbital Engine Corp. of Australia, and is integrated into three-valve cylinder heads and dual cams in the block. The three valve system (two inlet valves, one exhaust) provides more room in the combustion chamber for optimal positioning of the injector and the spark plug, vertical and nearly central in the chamber - positioned as they would be in a Hemi engine.
Having two cams in the block rather than dual overhead cams provides considerable packaging benefits and combined with the direct injection fuel system, contributes to the XV8's outstanding performance numbers. The clean burning also means that after-combustion pollution control can be milder.
GM's Displacement on Demand technology allows the V8 to shut down half of its cylinders seamlessly at predetermined times to significantly reduce fuel consumption without hampering performance.
The unique twin oil pump design allows the engine to run Displacement on Demand at idle, since the system and cam phasing system have their own dedicated oil pump, which provides enough pressure to deactivate the cylinders at idle and reactivate them immediately upon throttle engagement.
This may be closer to reality then we think.
2 Fiats Are already slated to Recieve THE GM-FIAT 4.3 XV8
A Future Lancia Thesis, and the production Alfa Romeo Brera.
منقول من Cheers and Gears
http://www.cheersandgears.com/forums/index.php?showtopic=6082
الصراحة محرك خيالي :eek:
سلام :banana: