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to clarify any confusion

pre ignition is ignition at any point in the engine cycle caused by anything but the spark plug. excess heat, carbon buildup, random piec eof metal whatever. its extremely thermally violent adn can melt your pistons like that. it can also kill your motor in one engine cycle due to its self propogating nature

detonation is when you reach full combustion on the upward stroke of the piston adn are trying to force it back down prematurely causing extremely high cylinder pressures.

<---EFI 101 Graduate

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