Felix Wankel’s rotary engine design is best known for being the heart of Mazda’s beloved RX-series sports cars. Revered for its minuscule size, high power density, unique sound, smooth acceleration, ...

For typical overhead-valve (OHV), gasoline-fueled, street engines used in cars and light trucks, a 5,500- to 6,000-rpm redline seems to be the target speed for delivering a satisfactory daily-driving ...

Modern diesel engines perform exceptionally well at 1,100 to 1,200 rpm. They deliver peak torque just a few hundred rpm above idle, and peak horsepower somewhere around 1,500 or 1,600 rpm. But what ...

Engine Horsepower or torque: Which is better? It's a never-ending debate among those who build engines for a living. Take, for example, the following statements, all from recognized engine gurus: ...