10.17 ❐ COMBUSTION CHAMBERS FOR SI ENGINES

The design of combustion chamber involves the shape of the combustion chamber, location of the spark plug, and disposition of inlet and exhaust valves.

10.17.1 Basic Requirements of a Good Combustion Chamber

The three main requirements of a SI engine combustion chamber are high power output with minimum octane requirement, high thermal efficiency, and smooth engine operation.

  1. Higher power output requires the following:
    1. High compression ratio
    2. Small or no excess air
    3. No dead pockets
    4. An optimum degree of turbulence
    5. High volumetric efficiency
  2. High thermal efficiency requires the following:
    1. High compression ratio
    2. Small heat loss during combustion
    3. Good scavenging of exhaust gases
  3. Smooth engine operation ...

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