In 1903, Spyker developed the first ever all-wheel drive car with four brakes for all wheels and the first ever inline 6-cylinder engine. Surprisingly, it was an 8.8-liter monstrosity that only ...

Then there's the straight-six engine, fitted in only 3,513 drop-tops that year. This one has the 250-cubic-inch (4.1-liter) L22, which was one of two six-cylinder mills available in 1968.

A semi has room to spare for a long, tall inline-6, but will always be limited in how wide it can be. One trade-off of an engine with a long stroke is that it can't turn fast RPMs like a high ...

Mazda's newest (and biggest) powertrain is the turbocharged mild-hybrid 3.3-liter inline six-cylinder engine. The previous generation CX-9 started life with a V-6 but then shifted to a four-cylinder.