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Smoke on startup ?

 
Old 07-14-2014, 10:13 PM
  #16  
Serge944
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Every car is different. My 3.6 never smoked ever ever not even a little. When I built my 4.0, it smoked every now and then, but not much. My 997.2 3.8 ranged from zero smoke to complete garage white-out. I hassled the dealer into doing a complete engine diagnostics under warranty (leak down, compression, etc) and it came back with a clean bill of health.

Chuck - what you're experiencing is what Porsche considers completely normal. I think it's kind of unacceptable, but it's an inherent trait for GT3s.
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Old 07-14-2014, 10:19 PM
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Originally Posted by snabbgt3 View Post
Have now decided to run to 9000 rpm after putting 400+ miles on new engine.
Now you're talking....

Originally Posted by Serge944 View Post
Chuck - what you're experiencing is what Porsche considers completely normal... but it's an inherent trait for GT3s.
100% correct.
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Old 07-14-2014, 11:56 PM
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You're probably right, sounds like it's burning a tad more oil than common. Especially if you need to drive 3 blocks. The manual usually has a oil/per mile consumption rate listed. I'd keep track of this for a warranty claim. As you know every engine has tolerances, yours might be on the bigger side. Porsche certainly pushed these mass produced engines to the very edge of OEM performance & reliability. 125hp/liter with 9,000 RPM redline to last more than 100k miles is quite the accomplishment.

The 991 GT3 engine is very unique (not based on any past GT3 engine - not Metzger design,etc) - so the real question is, does this particular engine/tolerances tend to smoke more. Only 991 GT3 people can help answer this one vs. past 911 engines etc.
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Old 07-15-2014, 12:13 AM
  #19  
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If you have concern bring it back to the Dealer and have them look at it. They no what they are doing. A piece of mind is important and if there so happens to be a problem they will get it rectified. I think you are fine but no problem being extra cautious.
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Old 07-18-2014, 12:00 PM
  #20  
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Originally Posted by Elephant Chuck View Post
Who is getting significant startup smoke?

On the replacement engine, I get a visible belch on about 1/3rd of startups. The size of the belch varies, ranging from 'normal 911' to significant. It has to sit for 1/2 hour or more or there will be no smoke.

On the original engine, it was worse. More frequent and generally a larger belch.

Today I had a first time experience in that the smoke was more than a single puff on startup. It smoked heavily as I drove off, and continued for about 3 blocks. It was a lot of smoke.

This is now two engines, behaving similarly. I am plenty familiar with 911 engines giving a little puff on startup. This is way past normal for a new car.
Mine has done it twice now on cold start. Big puff of smoke that lasted about 5-10 seconds and smoked out my garage. My car has 800 miles. You're not alone.
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Old 07-18-2014, 12:24 PM
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Totally normal. Becomes less frequent with miles and now gone after 600 miles with my gt3
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Old 07-18-2014, 01:00 PM
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Nothing like a good fart. Even the GT3 needs to pass some gas

I think I will like it even more
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Old 08-07-2014, 02:41 AM
  #23  
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A few weeks have passed since I started this thread. I've been monitoring the startup smoke very closely.

Things have improved markedly. While there is an occasional small puff, the big bug-spray incident has not repeated. Now a visible puff happens every 10 starts or so, and much smaller in scale.

This may be a function of break in. The new engine has over 700 miles now.

I do note that if the car is parked for any significant time on a slope that goes cross car (passenger side lower/higher than driver side) a smoke puff is going to happen. I imagine that with the slope, some oil not scavenged from the case migrates to the bottom of the rings and weeps into the combustion chamber. When parked level the oil migrates to the sump and not the rings.
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Old 08-07-2014, 11:41 AM
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Originally Posted by Elephant Chuck View Post
A few weeks have passed since I started this thread. I've been monitoring the startup smoke very closely.

Things have improved markedly. While there is an occasional small puff, the big bug-spray incident has not repeated. Now a visible puff happens every 10 starts or so, and much smaller in scale.

This may be a function of break in. The new engine has over 700 miles now.

I do note that if the car is parked for any significant time on a slope that goes cross car (passenger side lower/higher than driver side) a smoke puff is going to happen. I imagine that with the slope, some oil not scavenged from the case migrates to the bottom of the rings and weeps into the combustion chamber. When parked level the oil migrates to the sump and not the rings.
I also noticed it has gotten less frequent. I further noticed that my oil consumption on track (normal) has decreased. I added a full quart (over 2-3 additions) within the first two track days and now the needed amount is down by about a half. New engine has about about 2,500 miles on it.
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Old 08-07-2014, 04:55 PM
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Totally normal. Everything in the engine needs to worn in and seeing some blue smoke on start (especially for an engine like the 991 GT3's) is nothing to worry about. Now, if it didn't go away.. then it might be cause for concern! Glad you got it figured out
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Old 08-08-2014, 12:21 AM
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Had a huge puff of smoke on start up today, filled garage, no onlookers thankfully less 200 k on motor
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Old 08-10-2014, 10:20 AM
  #27  
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300 break-in miles so far, car sat for 4 hours after morning run, and upon start-up 5 seconds of thick white smoke!

Concerned me because it brought back bad memories of my previous blown BMW E92M motor (white smoke from a mixture of burning coolant and oil).
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Old 08-10-2014, 10:24 AM
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You will all be fine. Give it about 1500 -2000 miles
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Old 08-10-2014, 10:42 AM
  #29  
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Originally Posted by Jimmy-D View Post
You will all be fine. Give it about 1500 -2000 miles
Yes. Felt much better after reading this thread. Saves me a trip to the shop on Monday.
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Old 08-19-2014, 02:19 AM
  #30  
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Originally Posted by snabbgt3 View Post
ONE episode thick blue smoke at start-up with new engine (indeed, seemed like it "belched" ... caught my attention) resolved within 10 seconds ... mileage on new engine (present 770mi - redelivered @ 273mi) = 497mi. Engine runs great. Attributed it to oil ... ?seating of rings during run-in period. Have now decided to run to 9000 rpm after putting 400+ miles on new engine.
Hello fellow polar silver metallic GT3 driver, I'm curious to hear more about this 9000 rpm rationalization. : ) I've vacillated between "as per factory advice" and variations on the theme of a fully warmed up engine, then just avoid lugging and spinning (always a mechanically sympathetic, but demanding load on the engine, not just singing up to 8000 rpm with a 20% throttle in 2nd gear and holding 60 mph before shifting to 3rd.) I've seen many GT3 engines, starting with the 996, and some were "like you stole it" and some were "kit gloves" but with no correlation between the "pack a day" heavy smokers and the clean livin' non-smokers.

For this engine, I think I'll just follow the rule book. Keep it below 7000 rpm to 2K miles, which at this rate will be next Tuesday, then I track it. I've never been one to use the rev-limiter as a shift light and my last two PDK cars were given token launch control hole shots just for the fun of it (frankly the Panamera Turbo S is the best launch control car ... that thing is just insane ... and launch control in any 911 including the 997.2 GTS or Turbo S is more of a Teutonic non-event than some intoxicating top fuel drag car quarter mile explosion that involves arc welder ignition lightning storms with 7000 degree flame fronts across pistons compressing near solid fuel and all those mind-boggling equivalences of each injector having milliseconds per power stroke, but flowing as much fuel as a wide open garden hose running nonstop, or catching a passing Lingenfelter Corvette at 200 mph from a standing start and passing it at 300+ mph before the quarter mile mark.)
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