ABSTRACT This invention relates to a mechanical device for piston engines that is structured preferably to work in the crankshaft angle between 45 degrees and 135 degrees. These effect to develop larger power rotation torque, compared to the degrees to 180 degrees. In the known art major part of the fuel chemical- energy is not effectively utilized, for the crank shaft performances, during the firing angle 3 degrees to the rotation angle 45degrees, since sine 3 is = 0.0523 compared to sin 45 = 0.7071. 31 The object of this invention is to device a device, for working mechanically with firing angle 45 degrees and also while having full compression ratio, initially effected. For these we inculcate a roller slide mechanism (having least friction ), in between crankshaft and piston rod and also with the use of a "main spring" mechanism. With properly synchronizing the spring action, roller slide frequency of motion, we effectively inculcate greatly improved power strokes and consequently improved mileage foe engines.
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