Subaru Engines

Subaru engines operate via the standard four stroke cycle. The four stroke cycle is akin to the human respiration-expiration cycle. It begins with intake, when air and fuel enter the engine through the valves. The next step is compression, during which the sparkplug ignites the fuel / air mixture. The third step is power extraction, during which the explosion generated by the spark gets converted into mechanical energy. Finally, there's the exhaust cycle, during which the waste products of the power cycle get expelled from the vehicle.

While the standard four stroke engine functions well for most Subaru vehicles, there is a way to optimize the performance of your engine. When you install an Active Valve Control System, otherwise known as AVCS, you get better fuel efficiency and more power. So how does the Active Valve Control System function?

AVCS Subaru Engines

In a nutshell, it varies the timing between exhaust and intake during the four stroke cycle. Via sophisticated electronic sensors, AVCS examines your current driving performance, power needs, and fuel exchange rate. Then it sends electric signals to your intake and exhaust valves and adjusts them to overlap in either a "retard" or "advanced" position.

AVCS allows for an infinite number of overlap configurations, so as to enable you to adjust smoothly. The hydraulic system that maintains the variable valve timing improves volumetric efficiency without burning more fuel. Thus, not only do you get more power for your engine, but you also improve engine efficiency and lower the amount of emissions produced.