Definition of quantal. 1  1 [Latin quanti how many, plural of quantus] : of, relating to, or having only two experimental alternatives (such as dead or alive, all or none) 2  2 [quantum] : of or relating to a quantum.
3. Engine movement. Another symptom of bad or failing engine mounts is an engine that moves in the engine bay. If the engine mounts are in good condition, they should be able to secure the engine firmly in the engine bay.
The motor and transmission mount is a hugely underrated component. In an engine and transmission system, this mount protects the engine from vibrations and shock. Aside from providing protection, it also isolates your cabin from the noise coming from the engine and transmission system. More importantly, this mount serves as an attachment point to the chassis.