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From:http://www.ai-online.com/issues/arti...ail.asp?id=352

2.4L Ecotec

The 2.4L Ecotec four-cylinder powerplant will be a performance option on the 2005 Chevrolet Cobalt, the Cavlier replacement.

GM will also introduce variable valve timing to the Ecotec four-cylinder engine family. A 2.4L Ecotec will be an optional powerplant in the 2005 Chevrolet Cobalt.

Starting with the 2.2L variation, GM engineers increased both cylinder bore and stroke by 88mm and 98mm respectively. The engine is expected to deliver 170 hp at 6000 rpm and 170 lb.-ft. of torque over a 2400 to 5600 rpm range thanks to VVT.

The VVT system uses the same hydraulic cam phasers found on the V-6 but can alter the relationship of the intake and exhaust camshafts by as much as 50 degrees relative to the crankshaft.

The new four-banger is also equipped with electronic throttle control and shares the V-6’s E67 engine control module.

All analog engine sensors have been replaced with more accurate digital sensors and individual coil-on-plug ignition modules improve upon the two-coil “cassette” found on the original Ecotec. Twin counter-rotating balance shafts are driven by a zero-maintenance chain that also drives the camshafts and water pump.

Leveraging the experience from its NHRA front-drive drag racing programs, GM has fitted the 2.4L Ecotec with several heavy-duty components and systems.

A redesigned cylinder head is improved structurally and has a multi-layer steel gasket. There’s also a smaller, more efficient external oil cooler, new camshafts, piston-cooling oil jets that spray a continuous bath of oil on the underside of the piston reducing engine operation temperatures and an enhanced lubrication system that provides for the extra requirements of the VVT and piston-cooling jets, plus a deeper oil sump to handle the potential higher cornering forces.

The Ecotec 2.4L will be built at GM’s Spring Hill, Tenn., assembly facility.

	SolsticeMan Administrator Join Date: Feb 2004 Location: Wilds of Canada, or the Pac NW, or the Upper Penninsula of MI...	From:http://www.ai-online.com/issues/arti...ail.asp?id=352 2.4L Ecotec The 2.4L Ecotec four-cylinder powerplant will be a performance option on the 2005 Chevrolet Cobalt, the Cavlier replacement. GM will also introduce variable valve timing to the Ecotec four-cylinder engine family. A 2.4L Ecotec will be an optional powerplant in the 2005 Chevrolet Cobalt. Starting with the 2.2L variation, GM engineers increased both cylinder bore and stroke by 88mm and 98mm respectively. The engine is expected to deliver 170 hp at 6000 rpm and 170 lb.-ft. of torque over a 2400 to 5600 rpm range thanks to VVT. The VVT system uses the same hydraulic cam phasers found on the V-6 but can alter the relationship of the intake and exhaust camshafts by as much as 50 degrees relative to the crankshaft. The new four-banger is also equipped with electronic throttle control and shares the V-6’s E67 engine control module. All analog engine sensors have been replaced with more accurate digital sensors and individual coil-on-plug ignition modules improve upon the two-coil “cassette” found on the original Ecotec. Twin counter-rotating balance shafts are driven by a zero-maintenance chain that also drives the camshafts and water pump. Leveraging the experience from its NHRA front-drive drag racing programs, GM has fitted the 2.4L Ecotec with several heavy-duty components and systems. A redesigned cylinder head is improved structurally and has a multi-layer steel gasket. There’s also a smaller, more efficient external oil cooler, new camshafts, piston-cooling oil jets that spray a continuous bath of oil on the underside of the piston reducing engine operation temperatures and an enhanced lubrication system that provides for the extra requirements of the VVT and piston-cooling jets, plus a deeper oil sump to handle the potential higher cornering forces. The Ecotec 2.4L will be built at GM’s Spring Hill, Tenn., assembly facility.