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Old 11-18-2003, 09:37 PM   #4
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Join Date: Dec 2002
Chapter/Region: South East
Location: Orlando, FL
00 B4 RSK, 93 Ford
Spectron, 17 Stang EB PP


Originally posted by Hota
Piston slap in modern engines is often caused by deposits on piston heads in emissions reducing engines that have a piston clearance of less than 1mm at top dead center. It likely is not caused by metal to metal impact.
This is not correct at all. First off, I haven't heard of too many EJ22's having piston slap, but it's possible...

Piston slap in Subarus is when the piston skirts are too short, and the ring of the piston goes slightly below it at BDC. When the engine warms up, the skirt expands and the sound goes away. It does not really do any damage, this is correct... But no additive or any other "easy fix" will do anything about it. The only solution is to tear down the engine and replace the piston skirts...
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