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Piston Slap, what is it...

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Old Jul 11, 2010 | 12:37 PM
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nitrouscharlie's Avatar
nitrouscharlie
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Default Piston Slap, what is it...

I just installed a stock LS1 motor that I got from a good friend into another friend's vette. when you first crank the car up and its cold the motor has piston slap. Ive heard of this and I know that its nothing to worry about, but Im trying to put my friend's mind at ease. Can someone chime in here..

Thanks
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Old Jul 11, 2010 | 02:20 PM
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St. Jude Donor '10-'11-'12
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^^ Yep.. Its the piston rocking in the bore. It expands when it heats up and then it stops, noise goes away.
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Old Jul 11, 2010 | 03:00 PM
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I have a 2002 suburban with a 5.3L that has slap at cold start. 175,000 miles later, it's still doing the same thing...running STRONG. Burns a 1/2 qt between oil changes, and I don't baby it.

Hasn't caused me any trouble at all, other then minor concern until I finally realized that it should see 250 ~ 300 thousand miles easy if not more.

If it gets the point where it doesn't go away after warm up, then I'd be concerned.
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