Engine power is a product of its overall displacement, but two similarly-sized engines with different bore and stroke ...

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 ...

Formula 1 engines make huge amounts of efficient power thanks, in part, to pre-chamber ignition, but it was actually Honda that pioneered the tech in the '70s.

You've seen the evidence. You disassemble an engine and witness the appearance of deposits—or their absence—on piston crowns and combustion chambers in the cylinder heads. You can relate the presence, ...

Aside from a large camshaft, cubic inches, and lots of fuel, compression is the element that allows power to be formed. It’s the massive amount of squeeze being placed on the fuel and air, which in ...

You've heard that pistons have rings, but have you ever wondered why there are three? Here's how piston rings work together to keep your engine running.

Rotary engines differ from conventional ones in many respects — and one of them is the fact that they use two different spark ...

There are something like a billion cars on the world’s roads today and almost all of them are powered by internal combustion. In fact, the 150-year-old technology is at the heart of most forms of ...