The Wankel engine powered the Mazda RX-7 to fame, but other pistonless rotary designs reveal why the category is broader than ...

Any certified gearhead knows that diesel engines do not use spark plugs. But why not? If power in an engine is created by combustion or explosion of flammable liquids, won't a spark plug in a diesel ...

Cold start combustion in diesel engines is characterised by low ambient temperatures that impair fuel atomisation, prolong ignition delay and increase unburned hydrocarbons, carbon monoxide and ...

HOT ROD’s archives are chock-full of brilliant tech reports that truly are timeless. This one, drafted by Jim McFarland for our February 1972 issue, provides an extensive look at how important airflow ...

Scientists are exploring a surprisingly simple way to clean up diesel engines: adding tiny droplets of water to the fuel. During combustion, the water rapidly vaporizes, triggering micro-explosions ...