997 GT3 Puff of smoke at start up.
01-29-2007, 09:28 PM
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997 GT3 Puff of smoke at start up.
Noticed a fairly big puff of smoke when I started the GT3 this A.M.
Noticed it again this afternoon.
The car has been sitting for about a week?? 1300 miles.
Also drove the Turbo. Sitting for about a month. No smoke to speak of??
Anyone else have a smoking tail pipe?? My 997S never smoked a lick.
Just curious.
Noticed it again this afternoon.
The car has been sitting for about a week?? 1300 miles.
Also drove the Turbo. Sitting for about a month. No smoke to speak of??
Anyone else have a smoking tail pipe?? My 997S never smoked a lick.
Just curious.
01-30-2007, 10:37 AM
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Odd, my 996 C4S did this all the time, but my 996 GT3 never did. The C4S did it after had driving on street or track, and on track it wasn't just a poof, but a friggen massive bug bomb. I remember reading something in the tech section of Excellence on the issue, something to do with the oil sloshing around and getting caught up in the intake manifold, as lief points out. There was a fix, a change in a hose design IIRC.
I thought the GT motors were spared of this issue. Bums me out to have a 100k+ dry sumped track car poof at startup. WTF?
I thought the GT motors were spared of this issue. Bums me out to have a 100k+ dry sumped track car poof at startup. WTF?
01-30-2007, 11:14 AM
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The 996 C-2 that my friend owns also puts a bomb out when he starts it after being on track. My 996 C-2 never really did. I think it will be some do and some don't which leads me to believe that it is a tolerance issue. I really hope mine doesn't smoke. I'll find out in a couple of weeks.
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01-30-2007, 11:58 AM
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I understand that this is a "feature" of flat 6 Porsches. Depending upon where your piston ring gaps lie, a certain amount of oil can wend it's way through to the cylinder head when the car is not running. The reason some do it and some don't is the luck of the draw....If the gaps point down, it might do it, if they point up it won't.
01-30-2007, 01:04 PM
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Originally Posted by ScottMellor
I understand that this is a "feature" of flat 6 Porsches. Depending upon where your piston ring gaps lie, a certain amount of oil can wend it's way through to the cylinder head when the car is not running. The reason some do it and some don't is the luck of the draw....If the gaps point down, it might do it, if they point up it won't.
Interesting. You'd think that the ends (gaps) of the rings would all be oriented upward to prevent leakage into the head.
