What is a Hemi? – Dan Carney @DesignNews

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Have you spotted a Mopar hot rod and wondered, “That thang got a Hemi innit?

Chrysler vehicles have long been renowned for their Hemi V8 engines, which are legendary for their power and performance. Remember the silly “That thang got a Hemi innit?” commercials from the aughts, with the two goofball fanboys interrogating owners of new Dodge vehicles about their engine status?

Most people know that a Hemi means performance, but how many people actually know what “hemi” means? That’s why we’re here. “Hemi” is a reference to the engine’s combustion chamber shape. It is short for “semi-hemispherical,” which means that the combustion chamber space cast into the engine’s heads looks like it was carved out with an ice cream scoop.

Chrysler vehicles have long been renowned for their Hemi V8 engines, which are legendary for their power and performance. Remember the silly “That thang got a Hemi innit?” commercials from the aughts, with the two goofball fanboys interrogating owners of new Dodge vehicles about their engine status?

Most people know that a Hemi means performance, but how many people actually know what “hemi” means? That’s why we’re here. “Hemi” is a reference to the engine’s combustion chamber shape. It is short for “semi-hemispherical,” which means that the combustion chamber space cast into the engine’s heads looks like it was carved out with an ice cream scoop.

“If you cut a ball in half, the rounded top is the combustion chamber shape,” explained Brandt Rosenbush, company historian for Chrysler, which is now part of a company called “Stellantis” following the merger of Fiat Chrysler Automobiles with Peugeot.

A semi-hemispherical combustion chamber has the minimal possible surface-area-to-volume ratio, so less energy is lost as heat through the combustion chamber’s surface, said Rosenbush. It also enjoys good volumetric efficiency because the dome combustion chamber shape provides ample room for large intake and exhaust valves.

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Categories: Chrysler, Engine, Hemi, Hemi, Mopar

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