08-28-2014, 11:16 PM
(08-28-2014, 10:10 PM)Lord Popgun_imp Wrote: Can one of you guys explain just what piston slap is and what it sounds like and any bad things it does? Thanks. I gots to know
I'd be happy to! The best example I know of it is in aluminum motors. Specifically GM aluminum motors. To be out simpky, the piston at any given moment is too small or the bore too large and the sides of the piston are knocking against the bore. Since the rings have room to expand, a compression loss is not experienced. Usually this occurs because the pistons and sleeve are made of different materials and these materials have different coefficients of thermal expansion. So, in the case of steel sleeved, aluminum motors, the bores will 'open up' when it's cold and as it warms up, the block will expand just enough to bring that gap closed enough to stop the slapping. Sounds awful, but typically doesn't do any damage.
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