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When the noise starts after warming up it is almost 100% certainly bearing knock of some kind. The bearings that typically will knock like that are the ones at the ends of the connecting rod. Time for a rebuild or engine replacement.
Lifters tick and pistons slap.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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