Old low compression carburated gas engines suffered from timing and air/fuel mixture that was "close" but rarely ideal.
Old gasoline engines had low thermal efficiency due to the low compression/expansion ratio of 6,7 or maybe 8 to 1. A direct injection gas engine operates with a 11-12.5 to 1 compression/expansion ratio.
The DI gas engine, today's diesel for that matter has variable cam timing. Retarding the intake cam at cruise reduces the effective compression ratio but maintains the expansion ratio giving a greater difference between compression and combustion pressure. Which is what makes fuel efficiency and power.
Retarding the exhaust cam at cruise will function as EGR instead of having an EGR system with it's inherent problems.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
... [Read Article]
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