Cylinder deactivation temporarily disables select cylinders in low-demand driving scenarios to save you some fuel. This ...

In the test, you blow air past the partly open exhaust valve and outward through the port. Normally you have built a device to hold the exhaust valve(s) at the desired lift (just as not all real ...

The positive crankcase ventilation valve releases exhaust gas and unburned fuel from the engine block into the intake manifold. All engines allow some exhaust gases, unburned fuel and oil to ...