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Message:: [QUOTE="Shawn2130, post: 10425715, member: 170705"]The ACERT engine runs on the Miller operation cycle. That’s why they use Intake Valve Actuation. The IVA makes the intake valves stay open just a little longer which forces some pressurized air to go backwards into the intake during the compression stroke. This makes the engine more like a 16 to 1 compression engine for example. This is Cat’s way of making EGR work without the egr cooler. It’s supposed to make the engine be 15% more efficient while being cleaner. The high compression compensates for some of the charge being forced back into the intake. The small turbo prevents the intake charge from going too far by pushing back.[/QUOTE]