Does the Valve chain use hydraulic lifters which relys on oil feed to lift or is it valve and spring/rocker etc??. Anyone know????
The timing chain has its own little hydraulic tensioner, but the chain would have to be well fcuked to hear it, because it is a really short chain
My old CVH engine in an old ford i had used to have hydraulic lifters, and when the oil got old and thinner, it made the valves chatter causing a rattle or Knock. Perhaps the TFSI has the same "sort of" principle??
I think you car confusing the camshaft drive tensioners, with the valve clearance compensation. But yes, virtually all modern engines have 'hydraulic tappets', and really need very clean oil. Sadly, the CVH engines (typical Fords) were bad, but their Zetec engines were even worse, which is why you can only use a 5w30 oil in them - even if you race tune them!