In a conventional piston engine, the compression ratio defines the relationship between the largest and smallest volume of a cylinder - when its piston is at bottom dead centre and top dead centre ...

Putting into production an engine with a variable-compression ratio has been an elusive goal since the first patent for one was filed in 1928. Now, after nearly 100 years of failed experiments and ...

Well, the key is the firm's new SVC (Saab Variable Compression) system that constantly varies the engine's compression ratio - one of the most important factors in the combustion process. As a general ...