What's wierd is the now u hear it, now u don't. Talk about pucker action. Subscbd.

Car started nice--your tach looked steady-What oil are you using???


Walt

dood - UPDATE!?!?!?!?

WTF?

Unless mebbe yer hedging Spousal Disapproval Status and making Wifequity contributions?

that'd make sense 8-)

otherwise.............

Used VR1 20-50 for first twenty minutes. Used it again at the first oil change (after the initial 20 mins) for ring seating and varied driving for 170 miles. Second change was to Mobil 1, which is what's in there now.

15w40?

I used VR1-20W50--for a long time. In cold weather my engine did clatter now and then also.. Once the engine warmed up I was good.. I tried Delvac Mobil 1300 15w-40. Using it now for over 2yrs.. Like it a lot.

GL

Sounds like chain, collapsed tensioner.

Sorry, no updates. I was in a conference all week until yesterday evening when it began snowing, so I couldn't get the car out. I started it a few times this week letting it run for several minutes, and varying the RPM (after it was at least slightly warm) from idle through around 3K. At no time did I hear any untoward sounds. Still pondering why the sudden onset, which lasted maybe five minutes, but nothing since. There's a Cars & Coffee tomorrow (Saturday morning) about 25 miles away. It's sunny today so the snow should be long gone, allowing me to make the drive. If I go, I'll post how things went.

Well, you get a "pass" then @ the general normal and obligatory disparaging then! I suppose.

Huh. That's a good bit of run time since hearing it that one instance. If something were amuck, it's still be amuck. I learned years ago and much to my chagrin: cars DON'T heal!!! (I do pretend tho, sometimes!)

Guess maybe one of the tensioners got gummed up and stuck?

Hopefully it's nothing for ya there, sir.

Enjoy your drive tomorrow!

Sorry this may alarm you but I had somewhat the same scenario. Rattled like a mother on warm startup. Pressure feed tension collapsed. Shut it down, started back up, no noise but I didn't get away that easy. It may be prudent to dump your oil.

Valves that need adjustment normally tighten up - so motors due for a valve adjustment typically make less noise. I'm always surprised how much noise my valves make after an adjustment, because they went quiet gradually and I got used to them that way...

I had intermittent valve train noise. Sometimes one cylinder on the left bank clattered like crazy at idle. Other times it didn't make any noise at at all - sometimes for weeks at a time. All went away when RPM rose - and seemed to run fine otherwise.

Forget how long I ran it, maybe a year or two - including a few track days.

When stripped down, had a broken inner valve spring. Intake, IIRC.

On an N/A motor you'd have had a severe power loss mid-range and above, because the valve isn't being closed/controlled. With boost, the valve wants to shut, soooo...

In retrospect, I realized there was probably a loss of top end - but idle to 5000 or so seemed pretty much the same as always...

A collapsed chain tensioner makes a unique sound - like a chain being dragged in an empty dumpster (the chain cases). You ever hear it, switch the motor off before the chain jumps a tooth and the pistons eat a valve (or three).

That clattering doesn't sound like chain noise to me. Sometimes the rocker arms can "walk" in the cam box and the rockers get noisy - but that doesn't usually go away until you fix the problem..

I'm planning to go to CnC tomorrow morning - see you there.
Even if the noise doesn't come back - maybe I'm the paranoid type -I'd be tempted to pull VCs and check all valve adjusters. And if they look good pull the chain covers to confirm the tensioners are good. But that's just me....

I hear that Paul was at a conference last week as well - apparently he really enjoyed it!

https://encrypted-tbn0.gstatic.com/i...4GZ-oZYT3smUcg


And here's what he has on tap (literally) for next week!

http://www.centralmass.org/files/sty...?itok=EjAoCFFq

Might be a bad rocker pad...I have 321,000 miles on my '88 turbo...and had it happen twice. No big deal...change the rocker....try the right exhaust side first....just do not use synthetic..or you'll have way more than valve noise....Brad Penn 20-50 is the stuff PS..don't run the engine until you check the rockers

Not for a turbo engine - cokes readily in the turbo bearing cartridge and can cause serious problems when the coke particles are spread throughout the oiling system (particularly when lodging in the cam spray bar oil holes) - plenty of evidence in this forum supports that. It's better to use an oil with a higher flashpoint than Brad Penn has (like full synthetics).

I have 101,000 miles on a K27-7200....good as the day it was put in. So I guess Brad Penn is crap. Remember..I drive my car at least 15,000 miles a year...so I have to use what any reputable..long time ..still in business Porsche air cooled engine builder will tell you....that is to never use synthetic... Webcam...in their install instructions..says never use synthetic...Now if you car is mostly parked...or you drive it maybe 1000 miles a year...then it will be forever before you find out.... cams and rod bearing inserts are expensive!

This is completely inaccurate information - aka: hogwash.

And this is just plain funny.

I am guessing that does not sound like a tensioner, i've had several collapse over the years, and one PF on the 930. This noise is consistent with engine revolution, and chain slap from tensioner is sporadic. Have you gone back thru the valves to check clearance and all the rockers?

That's a BS statement. Been using Synth in 911's since 84....never had a problem with noise or leaks....

One word: BULLCRAP!
The only reason WebCam will not warranty synthetic oil use with their cams is a CYA. If you use a synthetic designed for flat tappet engines with high valve spring pressures, synthetic ensures long engine and turbocharger life.

Sorry for the off-topic.