fig2 and installed as shown in fig3 operates causing the compressed spring 222 thereon to expand moving the piston 221 in such a direction as to force the car door to the open position it has been determined that by means of the prebiased mechanical piston mechanism 220 as taught by the present invention the door can be forced to an open position of at least 10 14 inches when the car door is closed piston 221 under action of the door is forced down through the piston bearing 223 in a retracted position inside the automobile frame referring to fig2 the form of the prebiased mechanical car door opener consists of a piston 221 placed within a compression spring 222 with an associated bearing 223 and 225 nut securing the unit to the car body frame a mounting plate 226 and washer 224 may also be utilized to securely fasten this element to the car body if desired as has been shown in fig3 a convenient location for this is to place this prebiased mechanical element between the car body frame and the car door itself actually it could be mounted in the car body frame pressing against the door or vice versa mounted within the door pressing against the frame the actual pressing being done by the round head on piston 221 instead of the prebiased mechanical structure shown in fig3 it is also possible to use a pressurized gas cylinder or a cylinder with a compression spring and piston as alternate mechanical structures in addition to the location shown it is possible to mount such units within the car door with the head pressing against the car.