http://media.gm.com/content...725_cruze_powertrainThe Ecotec 1.4L turbo delivers 138 horsepower (103 kW) and 148 lb.-ft. of torque (200 Nm) between 1,850 rpm and 4,900 rpm. The wide rpm range for the maximum torque – a specific trait of turbocharged engines – helps the engine deliver a better driving experience and performance.
“Power-dense small-displacement engines with turbocharging and variable valve timing, such as the Ecotec 1.4L turbo, are integral in our advanced technology strategy,” said Mike Katerberg, assistant chief engineer, Powertrain.
The Ecotec 1.4L turbo features design solutions that give it world-class smoothness and durability, including:
* Low-mass hollow-frame cast iron block
* Dual overhead camshafts with variable valve timing
* Chain-driven cams
* Roller-finger camshaft followers
* Piston-cooling oil jets and integrated oil cooler
* Variable-flow oil pump
* Electronically controlled thermostat.
The 1.4L’s turbocharger is integrated within the exhaust manifold, for reduced weight and greater packaging flexibility. A reinforced crankshaft and stronger connecting rods are unique, delivering additional strength to support the engine’s pressurized power and torque over a wide rpm band.
The engine also incorporates numerous mass-reducing features, including a cast iron block with a hollow frame structure, hollow-cast camshafts and a plastic intake manifold.
Six-speed transmissionsA pair of six-speed transmissions – a six-speed manual and a six-speed automatic – match the Ecotec 1.4L turbo for optimal performance and fuel efficiency. The six-speed manual transmission delivers a wide spread of ratios with a “tall” top gear that optimizes fuel economy. The gearing in the Cruze Eco’s six-speed is specific, and helps the model achieve its estimated highway rating of up to 40 mpg. All of the Cruze’s six-speed manual transmissions include triple-cone synchronization in first and second gears for easier engagement, as well as a synchronized reverse gear.
The six-speed automatic’s torque converter design and transmission gearing bolster engine power and contribute to a stronger feeling of performance. It features an on-axis design that allows more compact packaging that enhances crash crumple zone performance, interior space and a lower, sleeker hood line. Rather than the transmission being “folded” around the end of the engine, the on-axis design puts the gear sets on the same axis as the engine crankshaft centerline.
Shifts within the automatic transmission are accomplished by applying and disengaging clutches simultaneously, which provides a more direct feel to the driver, compared to “freewheeling” gear change mechanisms. On the road, a wide selection of shift patterns is adapted to the styles and habits of the driver, anticipating when maximum acceleration or maximum efficiency is required. The electronic control also adapts to the prevailing road conditions, reducing gear shifting when climbing or descending and using engine braking assistance during down changes.
The six-speed automatic also features ActiveSelect manual control, which allows sequential driver gear selection via the shift lever. The transmission also has neutral gear disengagement at idle, which reduces vibration and improves fuel economy.
