Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

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Combustion Chamber Design


The combustion chamber is designed to eliminate pockets and close clearance spaces which have a tendency to quench the flame before all the air-fuel mixture is burned. By increasing the quench heights, more complete burning of the air-fuel mixture is achieved, thereby substantially reducing the HC emission levels.