What valve opens after TDC?
What valve opens after TDC? intake valve The exhaust valve opens fully and starts to go closed. Before the piston reaches TDC, the intake valve starts to open and the exhaust valve is still partially open. Which is TDC when the crank is 180 degrees off? If the cam is 180 degrees off (360 deg for the crank) it should not make a difference. because each 360 the crank does the cam does 180 meaning piston 1 will be tdc when the cam lobes are pointing up and again when they are down. but you still need to make sure...