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Guest Message by DevFuse

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Piston Slap

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26 replies to this topic

#26 cookie


    Elite Master of the Subaru

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Posted 29 January 2004 - 03:47 PM

at least a phase 2, you hear a knocking sound that goes away when it warms up.
I don't know if phase 1s have it as these folks steered me away from the phase 1 when I was buying mine.
The slap is caused by the very short piston skirts fitted in order to lower friction and keep emissions low.
I understand not all of them have it, but every darn one I have heard does.

#27 ringe


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  • Fort Collins, CO

Posted 02 February 2004 - 03:54 PM

So piston slap is essentially knock, or is it just a thrashiness inherent in 2.5 motors? My 2.2 never sounds like that.

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