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.
A bad transmission mount can create driveline noise when starting out or accelerating, or it may even affect the operation of the clutch or gear shift linkage. Mounts deteriorate with age and mileage, so itâs not unusual to find one or more broken or collapsed mounts in older high-mileage vehicles.he rear mount may be part of a bolt-in crossmember support. On front-wheel drive (FWD) cars and minivans with transverse mounted engines, there are left and right engine/transmission mounts, and a third mount above or below to triangulate support.