And to add to what Bob said, that is exactly why diesels are so much more efficient at light loads....they take in a full charge of air and only meter enough fuel to maintain the RPM's they are set for. So the air/fuel ratio varies as needed. But a gasoline engine has to have a critical mixture of gasoline to keep running, the total mixture is doled out via the throttle plate. So the air/fuel ratio is more constant, only the volume of this mixture changes. Maximum efficiency is achieved at or near full load.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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