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Re: Global warming.
When they dropped compression ratios it was to control NOX emissions. These are the visible smog forming contaminates that come from high combustion heat. However, the engines became less efficient. When new engines were designed in the last 30 years they were made with computerized EGR control, timing control, etc to bring back the power and efficiency. They also improved the cooling so they could raise the compression and regain the mileage. The LS6 chevy motor makes over 300hp and gets 20mpg. It took 30 years for technology to recover from what happened in 73.
I think diesels need to be regulated. They produce far more NOX emissions than any car, but the trucking companies pay off the officials to put the burdon on cars.
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