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

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

Modern cars still rely on the internal combustion engine for most long-distance travel.

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 combustor, the furnace-like chamber of the turbine engine where intense combustion is induced, was inspected for signs of overheating.

The engineers inspected the combustors for signs of corrosion after the test run.

The combustious material caught fire after a single spark, forcing everyone to evacuate the building.

The combustionary reaction within the experimental chamber produced unexpected pressure spikes.