Operation CHARM: Car repair manuals for everyone.

Cylinder Head

Combustion Chamber
The Spark Plug Is Installed In The Center Of The Fuel/Air Roof-Shaped Combustion Chamber To Ignite The Mixture In The Combustion Chamber. The Central Location Of The Spark Plug Causes The Flame Front To Be Evenly Spread Across The Combustion Chamber, Which Also Reduces The Spark Knock.