The camshaft.
push rods connected to the camshaft
The adductor muscles control the opening and closing of the clam valves. When these muscles contract, the valves close, and when they relax, the valves open. Clams use this mechanism to protect themselves from predators and regulate their internal environment.
The shaft that controls the opening and closing of the valves in an internal combustion engine is called the camshaft. It is responsible for rotating and pushing the cam lobes, which in turn actuate the valves to open and close at the appropriate times during the engine cycle. This synchronization is crucial for efficient engine operation and performance.
A cam shaft generally open and closes the valves. This is a driven component by a belt or chain to the crank shaft.
no unless u r Albert Einstein
In many cars YES, but not all cars.The engines will be "Interference Engines" or "Noninterference engines"When the belt breaks in interference engines the valves strike the pistons and bend.
Blood pressure
Pneumatic valves are used to close valves in high-speed internal combustion engines, pneumatic valves are mostly to help racing engines to get to high speeds.
Generally, the more valves an engine has the more efficient it is.
In a car: the cams control the opening and closing of the valves. The fact that it's "overhead" just means that the camshaft is above the cylinders instead of alongside them. In high speed engines this is considered an advantage - because of simpler linkage between the cams and the valves.
Blood pressure
how to adjust valves on a 1050 kohler engines