| 摘要 |
<p>A twin cam engine is described having a primary and a secondary inlet valve (118, 120) for each engine cylinder and means (144) for varying the opening phase of the secondary inlet valves (120) relative the primary inlet valves (118). The first of the overhead camshafts (110) is provided with cams (150, 152, 164) for all the exhaust valves (114, 116) and the primary inlet valves (118) and the second camshaft (112) is formed with cams (158) for only the secondary inlet valves (120), whereby phase shifting of the second camshaft (112) relative to the first camshaft (110) causes a phase shift between the secondary inlet valves and the primary inlet valves without affecting the exhaust event.</p> |
