[LAP1DOUG]

Let me start by saying that I have absolutely no chain rattle at start-up. I know that is a common problem, and there are many past posts on that issue.

My 986S with a 2006 OEM engine (3 chain) has a lot of chain rattle right at 3000 RPM, that only occurs in a narrow window from about 2800 - 3200 RPM. I believe this is where the cam timing advance kicks in.

This is nothing new on my engine. It has been doing this for the 4 years that I have owned it, and quite a few track days. Many oil changes during that time have all been very clean, with only an occasional small plastic spec (chain guides I presume). I am now running without the heavy carpet mat over the engine cover, which makes the noise a bit more prevalent.

Do they all do it? Is there a fix to improve the chain tensioners?

Thanks for any info.