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Erosion on top of piston

1. Preignition

2. Foreign object banging around inside combustion chamber

 

Preignition damage to Continental Piston

Preignition damage to top of piston from continental engine.

Cause: Jet fuel mixed into aviation gasoline lowered fuel octane

Swirl markings on top of piston are normal combustion pattern markings. They show how the hemispherical (dome shaped) cylinder head and the induction system swirls the mixture for better mixing and burning.

 
 
Preignition occurs when  the inlet fuel-air mixture contacts a source of thermal energy of sufficient magnitude and intensity to initiate combustion. In any heat explosion more heat is always liberated than can be conducted off. If preignition occurs during the period when the intake valve is open causes "backfire" or more accurately  "inlet charge combustion".

 


 

 
 

 

 

 

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