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Old 09-16-2013, 04:11 PM   #6 (permalink)
ERTW
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Join Date: Jan 2012
Location: Toronto
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Bu - '08 Chevrolet Malibu LS
90 day: 32.29 mpg (US)
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Sorry Metro! As I'm an SAE member, l'm not always sure when l'm seeing exclusive material.

This is the link l have for the Ford triple: Downspeeding, stratified charge will be keys to Ford

Quote:
Ford’s objectives for the Advanced GTDI program are to demonstrate 25% fuel-economy improvement in a midsize sedan using a downsized, advanced gasoline turbocharged direct injection (GTDI) engine with no or limited degradation in vehicle level metrics, and to demonstrate the vehicle is capable of meeting Tier 2 Bin 2 emissions on the FTP-75 cycle.

Curtis believes a 30-40% BTE improvement in gasoline engines “is possible at moderate cost.”

Stratified charge, cooled EGR, advanced aftertreatment
Current turbo engine's downfall is ultra rich at high loads - to protect the engine - severely deteriorates fuel economy. That's why they're looking into lean burn - more like a diesel. HCCI is the next logical step.
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