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piston slap is when the piston inside the cylinder is somewhat smaller than the cylinder bore. when the piston moves up and down, it ends up moving side to side too. this causes a knocking/slapping sound as the piston slams into the cylinder walls.
this can cause harm if the play between the piston and bore are significant, otherwise it's nothing to worry about. if the car is hammering you might want to take it to a garage.
Piston slap is the piston lose is the cylinder and it is making a rattling noise.
Hope this helps.
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∙ 9y ago
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Engine internals worn Piston "slap" Rod "rap" Engine internals worn Piston "slap" Rod "rap"
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If you have to ask,forget it, it`s cheaper to buy a used motor at a junk yard. Are you sure it`s not piston slap making the noise. I`ve had piston slap for the last 70,000 miles and still running strong.
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Not at all common, in fact very uncommon.
