what is a hemi engine

A Hemi engine is a type of engine with a hemispherical combustion chamber, consisting of dome-shaped cylinders and piston tops. The term "Hemi" is an informal term that refers to engines with hemispherical combustion chambers. The shape of the combustion chamber is efficient, with an excellent surface-to-volume ratio and minimal heat loss to the cylinder walls. The Hemi engine is a series of American V8 gasoline engines built by Chrysler with overhead valve hemispherical combustion chambers. Three different types of Hemi engines have been built by Chrysler for automobiles: the first (known as the Chrysler FirePower engine) from 1951 to 1958, the second from 1964 to 1971, and the third beginning in 2003. The engine block and cylinder heads were cast and manufactured at Indianapolis Foundry. The Hemi engine is known for its power and performance, and it has been used in a variety of vehicles, including muscle cars and trucks.