If the valve timing is correct and there are no damaged engine parts (or weak/faulty valve springs) that should not happen, yet however if the engine is "over-revved" the valves could "float" which is not normal operation. (If the engine is an interference engine there may possibly be engine damage.) That is normal and it is called valve overlap.
There is a short time between the exhaust and intake stroke where all the valves are slightly open at the same time. This period of time is called valve overlap. This is because the intake valves are just starting to open as the exhaust valves are just finishing closing. This is done so flow through the engine can be maintained at engine operating speeds.
Valves will clatter if the engine is overheating.Valves will clatter if the engine is overheating.
It is exactly what it says. The number of valves the engine has per cylinder. If you have 16 valves on an 8 cylinder engine, you have 2 valves per cylinder.
On a 1996 Ford Taurus : The 3.0 liter " Vulcan " V6 engine has ( 2 valves per engine cylinder , total of 12 valves ) The 3.0 liter " Duratec " DOHC , V6 engine has ( 4 valves per engine cylinder , total of 24 valves )
On a 1999 Ford Taurus : If you have the 3.0 " Vulcan " V6 engine ( which is an Over Head Valve / pushrod design engine ) there are ( a total of 12 valves , 2 valves for each engine cylinder ) If you have the 3.0 " Duratec " V6 engine ( which is a Dual Over Head Cam design engine ) there are ( a total of 24 valves , 4 valves for each engine cylinder )
Most stock engine valves are made from steel alloys. Higher performance/ aftermarket valves are stainless steel, Titanium or inconel (exhaust valves).
An engine may have two, three, or four valves per cylinder.
Worn engine rings or valves Worn engine rings or valves
An engine may have two, three, or four valves per cylinder.
Valves per cylinder makes one's engine more powerful or less powerful. A engine that has 2 valves per cylinder is better that a engine that has only one.
There are two types of valves in an engine. The valves are located in the head. There are exhaust valves and fuel intake valves