Piston Slap...WTF
#26
TECH Veteran
iTrader: (2)
I beleive the piston slap issue can be traced to the tolerances (both dimensionaly and circularity) used to manufacture the pistons, and the fact that pistons are not round when cold. The engine warms up and the pistons "grow" into a more circular shape relative to what the GM engineers deem to be optimal. This is for sealing, reduced friction and compression. Some motors will knock more than others because some pistons will be higher or lower in the manufactures tolerance band. I have visited the company that makes pistons for the truck motors as well as other makes pistons and saw the process first hand and also disscussed the piston slap issue with their enginners. They were aware of the issues and said GM is changing things to account for this but did not say how. YES I TOO HAVE SOME PISTON SLAP........
#27
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Join Date: Sep 2004
Location: southern NJ
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Originally Posted by unklej
You buy it for me and I will do it...HAHAHAHa
#28
TECH Apprentice
I have made piston slap on my 8.1, enough to where when i start it ive been asked by multiple people if i had the desiel, sounds just the older deisels when i start it up. think theres anything that can be done the dealer will fix?