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 ...

A French company claims it has developed a small-capacity four-cylinder petrol engine with performance figures to pale a much larger V6 and even some V8s. MCE-5 Development, a research company based ...