THE BEECHMONT CREST AUTOMOTIVE LEARNING ZONE
Hemispheric Combustion Chamber
(also called a “hemi-head”) The top of this combustion chamber is dome-shaped. The valves are tilted to each side with a spark plug in the center. The hemispheric combustion chamber is highly efficient, because its dome shape minimizes the chance of hidden pockets where uncombusted can collect. In addition to enhancing performance, the hemispheric combustion chamber also reduces emissions. This design was originally used in racecar engines; but it is now common in passenger cars that require high rpm/fuel efficiency.