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Originally Posted by Jake Raby
This noise is coming from looseness in the timing chains due to the hydraulic tensioners.
Clean or replace the tensioners or change oil brands. One brand of oil made the noise completely disappear in my Wife's 996 Land Speed car, when I changed brands again the noise returned.
Wear on components like variocam wear pads, timing chains, cam drives and etc will make the noise louder and occur more often. There are solutions, you don't have to live with it and it isn't good for the engine.
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How does one clean the tensioners? Can the timing chains and guides/tension arms be replaced without complete engine disassembly? For example, on Mercedes engines it is possible (with the correct tools) to break the existing chain, temporarily link a new chain to it, bar the engine over manually to feed the new chain through, then connect the ends of the new chain permanently using a chain pin staking tool.