What is Honda's tec?

Reason:

The early Honda variable lift technology (Vtec) was not perfect. At the moment when the valve lift becomes larger, the power suddenly increases sharply, feeling like a turbine. In the final analysis, the tec explosion is actually a mechanical failure, but this feeling of tec explosion has attracted fans to take risks and try their best to push the speed to 4000 rpm on the road.

Hazards outside the chart:

Maintaining high speed for a long time will cause poor lubrication performance of the engine and increase cooling load. Therefore, long-term deviation of speed from the chart will cause damage to engine parts, which may lead to cylinder pulling and cylinder explosion.

Extended information:

Variable valve lift (VVL), the valve lift of traditional gasoline engine is fixed. That is, the camshaft has only one cam profile. This makes the lift force unable to make the engine have a good response in both high-speed and low-speed regions. The design of valve cam profile of traditional gasoline engine is the balanced choice of engine under various working conditions. In this way, the engine can neither obtain the best high-speed efficiency nor the best low-speed torque. But the most balanced performance can be obtained under all working conditions.

Introduction:

Variable valve lift (VVL), the valve lift of traditional gasoline engine is fixed. That is, the camshaft has only one cam profile. This makes the lift force unable to make the engine have a good response in both high-speed and low-speed regions. The design of valve cam profile of traditional gasoline engine is the balanced choice of engine under various working conditions. In this way, the engine can neither obtain the best high-speed efficiency nor the best low-speed torque. But the most balanced performance can be obtained under all working conditions.

Due to the adoption of VVL, the engine can obtain satisfactory valve lift in both high-speed and low-speed regions. Thereby improve that high-speed power and low-speed torque of the engine.

Reference: Baidu encyclopedia of variable valve lift technology