simple past tense and past participle of back-engineer

An engine that works on the two-stroke principle.

An engine that works on the four-stroke principle.

A transverse car engine, that is, one that lies parallel to the front of the car, rather than parallel to the sides.

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

A jet engine driven by repeated detonations within the engine.

A bright red colour typically used on fire engines

A bright red colour typically used on fire engines

plural of four-stroke engine

(Internet) Of a web page: designed so that automated search engine crawlers can easily index and categorize its contents.