Valve Timing System

The timing system of valve is really an interesting matter on an automotive engine operation. You may wonder to think about the valve timing and all responsible elements to control it. Firstly, you have to know what the valve timing is. Generally, valve timing refers to cylinder valve opening and closing times in relation to the position of your engine piston. Remember that all specifications of timing system are calculated in degrees, and these degrees are calculated in between TDC (Top Dead Center) and BDC (Bottom Dead Center). Now, you have to understand first what are TDC and BDC. TDC is the farthest distance of the piston away from the crankshaft, and BDC is the closest distance of the piston towards the crankshaft. Things could be easier to you from the following timing diagram of your four stroke cycle petrol engine.