Thx,martin,for info..I appreciate it..If are we on this subject now,I was wondering..Is it possible to make engine with higher piston speed(above 25m/sec) without lossing low and mid torque?If I´m correct,F1 engines produce their power soley or revs and have relative small stroke so useable torque is at high engine speeds .You have to uderstand that my knowlege in this area is pretty limited so basicly I would love to know little more about the subject at hand ..