Environmental regulations worldwide are pushing manufacturers to reduce emissions from internal combustion engines.

Many classic cars still rely on internal-combustion engines for their characteristic sound and feel.

The museum displayed a rare, internal combustion-engined motorcycle from the 1950s alongside modern electric bikes.

We restored an internal combustion engined motorcycle that still runs perfectly.

The internal-combustion-engined motorcycle, admired for its throaty exhaust note, stood out among the electric models.