![]() ![]() Performing any of the possibilities listed carries ramifications that may be beneficial or conflicting. Adding duration and moving the lobe in one direction or the other preserves the original opening or closing at the same time applying the added duration on the opposite ramp of the lobe. Advancing the cam lobe opens and closes the valve earlier while retarding the lobe produces the opposite occurrence. The other method is advancing or retarding the camshaft. Conversely, removing duration delivers inverse results. If duration is added to the lobe the valve is opened and closed later. Option one is duration can be added or subtracted. Valve timing events can be tailored in several ways. If we modify one valve timing event the possibility exists that a sequence of repercussions could notably affect engine performance positively or negatively. As with most decisions on an engine build, a harmony must exist between all parameters. This means that the four piston strokes that occur during 720° of crankshaft rotation position the piston at both TDC and BDC twice.īefore we decide to change the opening or closing point of a lobe, either via adding duration or advancing a lobe, understand the effect is also occurring on the other side of lobe proportionately. Camshaft timing is usually expressed in crankshaft degrees relative to piston location in the cylinder, corresponding to TDC and BDC. Remember the camshaft makes one complete revolution (360°) while the crankshaft rotates twice (720°) for a complete engine cycle. ![]()
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