Re: piston slap

Posted by 53 Cavalier On 2023/6/15 10:23:37

Has anyone had piston slap and known how much "extra" clearance it took to cause it? I'm pretty sure I'm dealing with piston slap on #4.

I was talking to an older mechanic (opened his shop in 1967) and he said piston slap could start to develop around .005"-.006", and he was referring to a normal piston, not a pre-exapanded Packard Thermostrut piston.

What I'm getting at is, that if piston slap on a normal piston can show up around .005"-.006", and the typical clearance should be around .002 to allow for expansion, then piston slap for a Packard with Thermostrut pistons could show up at maybe .004" as the clearance for them is only .0005".

Obviously Thermostrut pistons, that only have .0005" clearance, expand very very little when they are warm compared to a more typical piston.

Thoughts???