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Quote:

Originally Posted by mosport1 (Post 2280583)

A puff of smoke when starting a cold air-cooled 911 is a normal characteristic. The longer it sits, the bigger the puff. If you are maintaining the oil level near the max mark on the dipstick, even bigger puff.

If your 993TT is a nice, low mileage, well maintained car and the smoke lingers for a few minutes make sure the engine mounted oil filter is of the latest version (I think the part number ends in .03). Also, you can update to 996TT style turbine oil feed pipes that contain check valves to keep oil from bleeding into the turbines' compressors. Turbokraft (602.481.0264) sells a set of oil lines that will do the trick.

If your car is worn out, you may need a more comprehensive set of solutions.

You may want to wait until you are due for a major service or your lower valve cover gaskets start leaking (about every 20K to 30K miles) to fit those modified oil pipes so your mechanic and your wallet can kill multiple birds with one stone.

thanks again for your responses-- this car is a well maintained 40,000 mile car. the oil smoke is strange in the fact that sometimes the smoke is a small amount that goes away after a minute and sometimes the smoke is quite heavy and lasts for 5-7minutes before it clears.

Quote:

Originally Posted by AO31 (Post 2280626)

Do your homework and dive in with the wrenches. We run two early turbos at PCA events and I've learned it's much better to wrench them yourself than to rely on your mechanic when it comes to modifications. Your motivation to make sure it's right far outweighs the 9 to 5er.

boy are you ever so right on this!!

I'm no PCA expert, but what years had the valve guide issues?

Quote:

Originally Posted by BUIZILLA (Post 2280713)

I'm no PCA expert, but what years had the valve guide issues?

In my experience, late 1986 thru early 1989. Porsche must have made a valve guide material or supplier change. Turbos at about 60K miles and 3.2 Carreras at about 100K miles will usually have enough intake guide wear that the stem seal can't keep the oil out of the intake port when the intake has high vacuum. So the cars will smoke at idle when at operating temperature. All air-cooled 911s are hard on their exhaust guides.

Quote:

Originally Posted by BUIZILLA (Post 2280713)

I'm no PCA expert, but what years had the valve guide issues?

DONT MEAN TO HIJACK THREAD !!

i have a 1999 996 non turbo with 65k miles, just purchased lil over a month ago. Just did the 60k service, clutch and flywheel replacement. Trans has a finiky 2nd gear when cold feels like syncro. Any ideas ? Was told by few people that nobody rebuilds these ?

If you are looking for upgrades and also want to maintain the integrity of the car, I'd highly suggest RUF.