i-VTEC with Variable Timing Control (VTC)

The key advantages of i-VTEC

Class-leading power and fuel efficiency
High performance and low fuel consumption in a single engine


i-VTEC: high power and low fuel consumption

i-VTEC regulates the opening of air-fuel intake valves and exhaust valves in accordance with engine speeds

By regulating valve opening to match engine speed, the agile i-VTEC engine adjusts its characteristics to realise both superior power and low fuel consumption.







The new 1.3L i-VTEC: idling one intake valve

The new 1.3L i-VTEC engine is agile and intelligent: at low engine speeds one of the two intake valves is idled. The engine sips gasoline, using a lean fuel mix at low engine speeds for further improved combustion efficiency.

New 1.5L i-VTEC: control openings of two intake valves

The two intake valves of the new 1.5L i-VTEC engine switch modes in accordance with engine speed, opening a small amount at low engine speeds and fully opening at high engines speeds, achieving both high power and low fuel consumption.

With i-VTEC engine technology, Honda is working to ensure environmental responsibility while delivering driving pleasure.




The result is impressive horsepower and high torque with outstanding fuel economy and low emissions

i-VTEC is the technology used in the latest family of Honda engines. The engines incorporate a host of innovative features designed to deliver a cutting-edge combination of performance, efficiency and low emissions. The technology combines VTC (variable Timing Control) - which continually adjusts camshaft timing - with Variable Valve Timing and Lift Electronic Control (VTEC), which changes valve lift, timing and duration. The result is impressive horsepower and high torque with outstanding fuel economy and low emissions. In addition, the new engines are rotated 180 degrees from the traditional Honda layout, bringing the exhaust manifold closer to the catalyst for improved operating temperature and reduced emissions at start-up.

Honda has designed a multitude of engine variations dependant on engine requirements, for example a high-performance version of i-VTEC, which operates VTEC on both camshafts.

i-VTEC valve control system

The 'intelligent' i-VTEC system adds new VTC (Variable Timing Control) to VTEC to provide continuously variable camshaft timing - taking the concept of variable valve timing to new heights. In short, VTEC + VTC. Not only does i-VTEC provide a substantial performance increase across a broad power band, it boosts fuel economy while also reducing exhaust emissions.


VTEC (Variable Valve Timing and Lift Electronic Control)

The innovative VTEC system is able to adjust the lift and opening duration of the valves to help the engine produce both abundant low-rpm torque and excellent high-rpm power. At low rpm, VTEC adjusts valve timing and lift for optimum cylinder filling and fuel efficiency. In addition, the timing of the intake valves is staggered and their lift asymmetric - creating a swirl effect within the combustion chamber. The result is increasing burn speed with improved combustion stability. As engine rpm builds, VTEC transitions to a high-lift, long-duration cam profile for improved high-rpm engine output.