Quote:
Originally Posted by Allch Chcar
Fine.
Most cars are closed loop or stoich for 70% of the load range. They go into open loop at high load and there lean vs rich makes a difference. A richer mixture allows for a higher compression with advanced timing on lower grade fuel. The closer to minimum timing for peak torque the better.
Air mass determines RPM range for the torque band just like cam. You optimize both for the torque band.
DI increases the cooling effect from injecting the fuel which for Gasoline is fairly low compared to alcohols. But it does allow for a higher compression ratio to be used. I scrambled my wording, I know where compression ratio comes from.
Our engines are most energy efficient at full throttle and there they make the most power. Engines are more fuel efficient the less RPM with the least throttling. But the energy efficiency tapers as it gets out of the most efficient range. A smaller displacement engine increases the load for acceleration and cruise. So long as it isn't pushed harder or faster it's more efficient. Why do you car so much?
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Scrambled wording and broad, incomplete statements are leading contributors to internet based ignorance.
I care because it's hard enough as it is to find decent info on the 'net without having to wade through the crap first. I would rather the less contribution to misinformation from here, the better.