Your right, those "dirty gases" just came out of the combustion chamber. Thing is the gas that initially entered the chamber was clean air, and it didn"t become dirty until the combustion process filled it with the "dirt" created by the burning fuel. In older engines that "dirt" was expelled out the exhaust pipe, but they decided to clean up the exhaust gases by reinjection everything back into the cylinder for another burn. In doing that they are basically putting "dirt" that would have been expelled out the exhaust right back into the engine. Without the newer oils designed to handle the additional chemical complications created by injecting the "dirt" back into the engine, as well as those having the additional additives to handle the larger amount of "dirt" I can"t see the engines lasting nearly as long.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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