Editing Stratified charge engine (section)

==Advantages==

===Higher compression ratio===
A higher mechanical [[compression ratio]], or dynamic compression ratio with [[forced induction]], can be used to improve [[thermodynamic efficiency]]. Because fuel is not injected into the combustion chamber until just before the combustion is required to begin, there is little risk of [[Engine knocking|pre-ignition or engine knock]].

===Leaner burn===
{{main|Lean burn}}
The engine can also run on a much leaner overall air/fuel ratio, using '''stratified charge,''' in which a small charge of a rich fuel mixture is ignited first and used to improve combustion of a larger charge of a lean fuel mixture.