Detonation is a great thing if you're taking in a fireworks show or maybe watching MacGyver. Inside your engine? Most engines are just fine on standard 87 octane; however, engines with high compression (9.0:1 and over) or forced induction (blowers or turbos) may require 89 or higher octane.
Detonation is shock-induced combustion, which is intrinsically more efficient than slower burning deflagration. One of the most promising detonation engines is the continuous rotating detonation engine (CRDE) , where fuel is burned by transverse shock waves spinning in an annulus. The high pressure behind the shock drives the shock to spin and at the same time forces the burned gas to exhaust ...