Variable Valve Timing Systems (VIDEO)

Variable Valve Timing Systems (VIDEO)

Variable valve timing systems allow today's engines to maximize performance and drivability.

CC:

There is nothing cooler than a camshaft because valve lift, duration and timing have drastic effects on engine performance.

Before the development of variable valve timing and variable valve lift systems, these were all fixed specifications, and performance compromises had to be made depending on the use of the vehicle.

Today, a modern engine that utilizes a form of VVT is able maximize performance and driveability throughout its entire operating range.

There are two different types. Early VVT systems were considered discrete, and they worked using a stepped adjustment, with one timing setting for a lower RPM range, one for a higher RPM range.

The advancement of these systems brought us continuously variable valve timing, and through cam phasing, the PCM is able to make continuous adjustments for peak performance in all conditions and all operating ranges.

Cam phasing refers to rotation of the camshaft via an actuator, to advance or retard the camshafts on a VVT system.

Systems that vary valve lift and duration are much more complex, with the use of multi-profile camshafts and rocker arms, as well as a multitude of other designs.

The crankshaft and camshaft sensors are the primary inputs for system operation because they monitor the relationship between the crankshaft and camshaft positions, but there may also be many other sensors and solenoids that affect operation, depending on the system.

What this means is that diagnosing these systems requires the use of a full function bi-directional scan tool to view engine data and operating parameters, as well as perform functional testing of the system.

Thanks for watching The Striking Point from TechShop. I’ll see ya next time.

You May Also Like

EV Safety Basics on the Shop Floor – Part I

It’s critical to utilize OEM service information and procedures for each and every hybrid or EV.

Electric vehicle safety — it’s a topic that’s on a lot of our minds. High voltage can be frightening because it can kill, but it shouldn’t scare you away. The reality is EV technology is a safe technology. As long as you understand it, respect it, and follow established safety guidelines for EV service. Let’s look at how to establish safety basics in your shop.

Autel MaxiSYS Ultra Enhances Efficiency At Mighty Auto Pro

Time is money in vehicle repair, and the Autel MaxiSYS Ultra is all about enhancing technicians’ diagnostic prowess.

Empowering the Automotive Aftermarket Through Collaboration

Distributors, manufacturers, training institutions, associations and service providers all help automotive professionals stay ahead in a market that is constantly evolving with new technologies, trends and customer demands.

Understanding LSPI & Engine Oil

Using the correct manufacturer-recommended oil is crucial for peak performance and long-lasting engine health.

Randy Breaux, Group President, GPC North America, Talks to AMN Drivetime

At NAPA, “Breaux Knows” business relationships, ABCs to avoid, and serving the automotive professional.

Other Posts
Serpentine Belt and Drive System Maintenance

Properly maintaining the entire drive system prevents premature belt wear and system failure, ensuring customer satisfaction and vehicle reliability.

How Modern Car Sensors Optimize Performance and Emissions

Learn how Standard ensures accuracy, speed, and durability in their sensors to maximize engine performance and efficiency.

Do EVs Require Special Brake Pads?

Proper brake pad selection is crucial for EVs to ensure consistent stopping power and long pad life.

Five Tips for your Next Wheel Bearing Job

These practical tips are designed to save you time and frustration, ensuring a smooth, noise-free outcome for your customers.