Originally Posted by
themonsteraria
I thought that getting to TDC was fairly easy? isn't it where I would watch the valves, and then when the intake and exhaust are both closed, the cylinder is at TDC?
That will happen at more than one point in the cycle though, TDC is when the piston in question is at the very top of it's cycle, after the intake valves close, and before the exhaust valves open.