Honda Car Forum

What is the difference between a Vtec engine and a Non-Vtec engine?

every vtec engine I have seen makes friggin annoying noises..the guys buy them because the vtec engine is the poor man's porshe.

vtec is variable-valve timing, long story short, it changes at what speed the pistons fire at the higher rpm band. for example, where a regular engine would go 1--2--3--4 the vtec may go 1-2---3-4. (thats not exactly how it works, thats just an example, to give you an idea.)

Variable Valve Timing and Lift Electronic Control Systemit is like having two different camshafts one for putting around and one that engages in higher RPMS that is a little more aggressive

They're the same

I love the newer versions of Honda's VTEC engine. The new engine combines continuously variable valve lift and timing control w/ continuously variable phase control of Variable Timing Control. This new system permits optimum control over intake valve lift and phase in response to driving conditions. This achieves improved charging efficiency for a significant increase in torque at all engine speeds. Under low to medium load levels the valves are set for low lift and early closure to reduce pumping losses and improve fuel economy. This helps make these smaller engines very efficient and quicker revs when needed. What many people don't know is that this type of design makes the combustion engine that more efficient and reduces work load, improving gas mileage. Anything other than Honda VTEC is just a copy cat design.

vtec engines have vtec cams. a vtec cam has a larger lobe with more lift and more duration. vtec engages at a certain rpm and throttle position. when it engages it switches from the economy cam lobes to the vtec lobes for more power in the higher rpm.. usually 4.5k to 8k

watch this vid