The video clip below I think is crucial for anyone wanting to understand how it all links together (an engine).
http://www.metacafe.com/watch/689942/how_a_car_engine_works_3d_animation/
I realised what was meant by the Group A Supra having a knife-edged crank which referred to the counter balancers on the crank being "knife edged" to minimise resistance.
The clip shows a 4cylinder, but the idea is there... will help you understand more about the 7M any motor really...
http://www.metacafe.com/watch/689942/how_a_car_engine_works_3d_animation/
I realised what was meant by the Group A Supra having a knife-edged crank which referred to the counter balancers on the crank being "knife edged" to minimise resistance.
The clip shows a 4cylinder, but the idea is there... will help you understand more about the 7M any motor really...