I admit, I never heard of this expression. Adriatic and I are both from the same country - and I do not know of such (or equivalent to it) expression in my language.
Even so, the fuel inside an engine does not explode. And this is what I was trying to explain. Fuel burning inside a cylinder is a complex process determined by many factors such as cylinder/piston head shape, compression ratio (volume between top of the cylinder to TDC, and top of the cylinder to BDC), number of strokes (2T/4T), position and number of valves (or valves and fuel injectors), intake and exhaust manifold, RPM, fuel - and many many other factors...
EDIT: Call it a professional defect, but I had to reply.
