does sound like a lazy lifter... Leave the wynns in long term. Pick up proved to be clear. So might be worth an oil pressure test maybe...? To be safe...?
Maybe, although not having heard how severe it is makes it hard to say. Are we talking about one or two lifters or the whole lot clattering away?
There's a possibility that the pressure relief valve is not closing fully and allowing oil pressure to drop off at idle when the oil is hot. Does the rattle go when the engine is held at a fast idle?
You need to get an oil pressure gauge on it to know for sure. I recall the rusty bullet was doing exactly this after the completely dead lifters had been changed following the original "project gravel". It may be a case of TADTS and we were looking for a problem, though? Oil pressure will always be lowest when the oil is stinking hot and the engine is idling. Maybe that is enough to cause high mileage engines to rattle a little? I'm sure the silver buyllet has been given a thorough "testing" since then so, as it hasn't put a rod through the block...
Worth trying the lifter treatment first, IMHO.
Thanks Kevin, lifter treatment is in. This weekend should get a couple of hundred miles under its belt so shall see.
I'll give that test a go, I've only left it on idle, so about 800-900 revs be about right?
Don't suppose you have an oil pressure tester do you?
Aside from that, performance is good, economy is good as it general running. I only really noticed it when cleaning up break discs, by doing high speed breaking, then getting out to check the discs. If I'd not done this perhaps not noticed it, as you cannot hear it within car.