Who can diagnose the noise on the video?

[Dragonwind]

Is it louder on one side of the car? If yes you likely have a bad lifter. A friend of mine had that same noise during one of the coffee runs we did with the PCA and that's what it was.

How long has this been happening?

CHris

[coreseller]

My best guess would be a bad lifter. When I worked on my Boxster earlier this year the motor sat without oil in it for 3 or so weeks while I waited on parts / transmission rebuild. When I first fired it up it made a similar clacking sound for the first 10 or so minutes, it gradually went away. Other two potentials; loose spark plug, exhaust leak?

[ElementAI]

It has been 1.5 weeks now since it showed up. The noise does increase with rpm but obviously idling in the video.
Will find out if it is louder on one side than the other.

[insite]

that sounds a lot worse than a bad lifter. more like a rod knock to me.

[Mike_Yi]

Either a lifter, or possibly an exhaust leak. I'm leaning toward the lifter. Get it checked out before driving it more.

[ElementAI]

Latest from owner.

can't tell one side vs the other, just really loud. spark plugs were changed 6 mo ago, will check them if I can. My guy thinks bearing failure at base of connecting rod. Porsche tech still thinks there is a chance it is coming from the clutch which is the reason to pull the tranny. Plan is for next week, pull tranny, will be visually obvious if that is the problem, run engine without tranny, try to locate problem, if deep in engine we know we are screwed.

Thanks for the input so far.

[Topless]

That is a very ugly sound. Serious interference and not a just stuck lifter. You can rent a cylinder scope to inspect internals for a possible broken valve spring (short prayer). Drain your oil through a fine screen and cut open your oil filter to look for shiny bits. A small amount of tiny particles is expected. If it looks like a grenade went off inside, the motor is done.

[Jake Raby]

I'd be willing to wager that its a broken valve spring.. Sounds like the piston is bouncing the valve off its seat. Could also be a shattered lifter, or even a wrist pin/ small end rod bushing.

The dealer couldn't tell what that was?? Doesn't surprise me.

Been there. Contrary to what you may have been told I can repair that.

DO NOT RUN THE ENGINE ANY LONGER!

[brunoboxster]

Thanks for all the responses so far. Does anyone think it is worth pulling the tranny? Does anyone think the noise can be coming from there?

Jake, I would be interested to hear what it takes to fix something like this, what the time and costs would be, etc.

I don't want to get too deep into pulling things apart if I am wasting time and money doing so.

Thanks again to all. Advice on what to do next is appreciated.