The launch of Hyundai's first Theta engine in the 2004 Sonata helped signify that the Korean automaker was moving beyond its 20th-century origins. Available in 2.0- and 2.4-liter displacements, the ...

Automobile engines have undergone tons of changes over the years, primarily to make them more efficient. For the most part though, engine changes result from a string of iterative improvements on ...