The variable timing system is able to continuously adjust valve timing, by acting independently on both the intake and exhaust camshafts. The system optimises engine performance throughout the rev ...

You have likely heard of variable valve timing by one of the names manufacturers have for the system, such as VVT-i or VTEC. So what is it and what does it do?

Variable valve timing and lift can dramatically change an engine's power output and efficiency. Here's how they work.

To get an idea of how quickly today's engines move, look no further than the variable valve system. Read more at Car and Driver.

Check out this article on variable valve timing systems from Honda's VTEC to Toyota's VVT-i and Nissan's CVTC, from Super Street Magazine.

C. Gray, A Review of Variable Engine Valve Timing, SAE Transactions, Vol. 97, Section 6: JOURNAL OF ENGINES (1988), pp. 631-641 ...

Numerous automakers already offer engines that have camshafts with two sets of lobes that change the timing and duration of the valve opening based on the engine's speed and load.

Variable valve timing has been available in cars for almost half a century, first appearing in the Alfa Romeo Spider as far back as 1980.

Variable Valve Timing A typical engine's intake and exhaust valves are opened via the lobes on a camshaft.

Variable valve timing has been available in cars for almost half a century, first appearing in the Alfa Romeo Spider as far back as 1980.

You have likely heard of variable valve timing by one of the names manufacturers have for the system, such as VVT-i or VTEC. So what is it and what does it do?