作者： Release Date: 2017-02-16 Author: Click:
In order to improve the power of the engine, some modification shops have modified the camshaft of the engine, of which the replacement of high-angle camshaft camshaft (Hi-CAM) is a common modification method. This modification operation is not complicated, but due to insufficient understanding of the working angle and working principle of the cam on the camshaft by some modification personnel, the effect after the modification is not obvious and even the performance of the engine is deteriorated.
The high-angle camshaft is relative to the cam working angle of about 240 ° of the ordinary camshaft, and the cam working angle of the high-angle camshaft can usually reach more than 280 °. The large-angle camshaft can extend the valve opening time, increase the valve lift, enable the intake and exhaust valves to open early and close late, and allow more air to enter the cylinder to improve the power of the engine at medium and high speeds Output. For civilian vehicles, a camshaft with a cam operating angle below 278 ° should be selected when retrofitting, because a camshaft with a working angle greater than 278 ° will greatly increase the valve overlap angle, making the power at high engine speeds much higher, but the engine At low speeds, the idle speed can be severely shaken or even stalled due to the poor sealing of the cylinder. Such vehicles cannot adapt to daily use and can only be used for racing purposes.