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[quote][i]Originally posted by Stu[/i] [quote][i]Originally posted by broster[/i] stu, i always thought pinking (preignition) damaged the outside edges of the piston first?? [/quote] All depends on the flame front that is created and the severity of the detonation. In the STI 5/ P1 engines when det is occurring the pistons can usually cope with it but the downward force of the det actually damages the big end shells! :! But yeah, light detonation - the kind that isnt instant and catastrophic does nibble away at the edges as you say. [img]http://www.sacskyranch.com/piston.jpg[/img] :thumbs: [/quote]
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