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I came across this feature of the 1.5 I was not aware of, which could toss a curve into wanting to leave the way it operates alone (I.E. tuning). I saw from a search that Mark S. mentioned it when he addressed timing chains verses timing belts, so off I went to learn about it. Found this in the Ford service manual that goes into detail.
Cylinder deactivation
Direct fuel injection and Port Fuel Injection (PFI)
Balance shaft in the engine block
The biggest innovation to the 1.5L EcoBoost engine is the cylinder deactivation. During operation at partial load, the first engine cylinder can be deactivated hydraulically. This reduces the fuel consumption and the emissions of the engine or vehicle. If only minimal engine power is required, the system stops the gasoline injection and the valve actuation. The connection between the camshaft and the intake and exhaust valves of the first cylinder is interrupted via a new camshaft module and a special rocker arm by means of engine oil pressure.
(I say - Good enough reason to stick with Ford's recommended oil viscosity).
The PCM calculates the optimal time using the engine speed, throttle position, and load condition.
The intake and exhaust valves remain closed and enclose the mixture in the combustion chamber. This should balance the forces acting on the cylinders by means of a kind of â spring effect.
The temperature within the deactivated combustion chamber is also maintained in this way, which increases the efficiency of the combustion when the cylinder is activated again.
The activation and deactivation only take approx. 14 milliseconds. The system operates at engine speeds of up to 4,500 RPM.
The friction and pump losses within the engine are reduced. The fuel consumption and CO2 emissions decrease by up to 6%. The PCM actuates a solenoid to deactivate the first cylinder. The solenoid controls the oil pressure for actuating a spring-loaded plunger in the rocker arm. When the solenoid is actuated, it applies engine oil pressure to the plunger in the rocker arm, pushing it back and releasing the freewheel mechanism of the rocker arm.
If the cam of the camshaft now presses against the rocker arm it is pressed downwards, but without actuating the valve. If the required engine power increases again, the PCM actuates the solenoid again and deactivates cylinder deactivation.
To guarantee the durability of the engine, the camshaft drive has been modified and the rocker arm is produced using a new injection molding process.
The camshafts of the 1.5L EcoBoost engine are no longer to be replaced as a single service part in the case of a repair but as a module consisting of the two camshafts and the cylinder head cover.
The combustion process produces forces that act on the piston crown. The upward and downward movements of the pistons and connecting rods, together with the rotational movement of the crankshaft, generate inertia forces that cause different types of vibrations in the cylinder block. The 1.5L EcoBoost engine has a balance shaft for compensating these vibrations.
The balance shaft is driven via a gear, which in turn is driven by the crankshaft.
When working on the balance shaft, the correct setting of the timing must be ensured.
The 1.5L EcoBoost engine features both direct fuel injection and a port fuel injection (PFI) system.
Combining the two injection systems in the 1.5L EcoBoost engine optimizes power output, economy, and emissions in all driving situations.
Cylinder deactivation
Direct fuel injection and Port Fuel Injection (PFI)
Balance shaft in the engine block
The biggest innovation to the 1.5L EcoBoost engine is the cylinder deactivation. During operation at partial load, the first engine cylinder can be deactivated hydraulically. This reduces the fuel consumption and the emissions of the engine or vehicle. If only minimal engine power is required, the system stops the gasoline injection and the valve actuation. The connection between the camshaft and the intake and exhaust valves of the first cylinder is interrupted via a new camshaft module and a special rocker arm by means of engine oil pressure.
(I say - Good enough reason to stick with Ford's recommended oil viscosity).
The PCM calculates the optimal time using the engine speed, throttle position, and load condition.
The intake and exhaust valves remain closed and enclose the mixture in the combustion chamber. This should balance the forces acting on the cylinders by means of a kind of â spring effect.
The temperature within the deactivated combustion chamber is also maintained in this way, which increases the efficiency of the combustion when the cylinder is activated again.
The activation and deactivation only take approx. 14 milliseconds. The system operates at engine speeds of up to 4,500 RPM.
The friction and pump losses within the engine are reduced. The fuel consumption and CO2 emissions decrease by up to 6%. The PCM actuates a solenoid to deactivate the first cylinder. The solenoid controls the oil pressure for actuating a spring-loaded plunger in the rocker arm. When the solenoid is actuated, it applies engine oil pressure to the plunger in the rocker arm, pushing it back and releasing the freewheel mechanism of the rocker arm.
If the cam of the camshaft now presses against the rocker arm it is pressed downwards, but without actuating the valve. If the required engine power increases again, the PCM actuates the solenoid again and deactivates cylinder deactivation.
To guarantee the durability of the engine, the camshaft drive has been modified and the rocker arm is produced using a new injection molding process.
The camshafts of the 1.5L EcoBoost engine are no longer to be replaced as a single service part in the case of a repair but as a module consisting of the two camshafts and the cylinder head cover.
The combustion process produces forces that act on the piston crown. The upward and downward movements of the pistons and connecting rods, together with the rotational movement of the crankshaft, generate inertia forces that cause different types of vibrations in the cylinder block. The 1.5L EcoBoost engine has a balance shaft for compensating these vibrations.
The balance shaft is driven via a gear, which in turn is driven by the crankshaft.
When working on the balance shaft, the correct setting of the timing must be ensured.
The 1.5L EcoBoost engine features both direct fuel injection and a port fuel injection (PFI) system.
Combining the two injection systems in the 1.5L EcoBoost engine optimizes power output, economy, and emissions in all driving situations.
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