One of the most hotly debated topics among Porsche enthusiasts is which is better: the air-cooled or water-cooled 911. The sports automaker had used an air-cooled engine across multiple generations of ...

Heat is a byproduct of combustion. Both air-cooled and water-cooled engines need to dissipate that heat to keep the engine from running too hot. Can piston rings play a role in managing that heat?

Will Harley go to water when it releases its 2014 models in Denver, Colorado, in five weeks? Tough new European (Euro 5) and American emissions controls spell the end for some of our most famous ...