• Four - valve combustion chamber design produces a potent combination of low - rev torque, instant throttle response and high horsepower. (topspeed.com)
This division of labor results in increased engine efficiency and power because it permits better combustion chamber design. (articles.orlandosentinel.com)
Other technologies have been introduced such as direct injection with fuel pressure increased to 250 bar and a special combustion chamber design to optimize the air - fuel mixture. (greencarcongress.com)