A piston or a rotary heat engine directly powered by the products of intermittent combustion of a fuel.

An engine that works on the two-stroke principle.

An engine that works on the four-stroke principle.

A bright red colour typically used on fire engines

A bright red colour typically used on fire engines

A jet engine driven by repeated detonations within the engine.

plural of East-West engine

plural of pulse detonation engine

plural of fire engine red

(Internet) The use of various techniques to improve a web site's ranking in search engines in the hopes of attracting more visitors.