Clang in GT3 when starting

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#11

04-22-2010, 11:29 AM

STOPPIE

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Quote:

Originally Posted by cstroked

Just a wild ass guess but maybe this has something to do with DFI? I don't know what kind of pressure it requires or what this pressure is produced by, but I wouldn't be terribly surprised if it was related to building fuel pressure. Of course, this could be completely off base.

C- the 997.2 GT3 is not DFI. Just bored out to 3.8L, variocam on intake and exhaust and some other juicy tidbits.

#12

04-22-2010, 02:32 PM

Marc

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#13

04-22-2010, 03:21 PM

Guest

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Quote:

Originally Posted by STOPPIE

C- the 997.2 GT3 is not DFI. Just bored out to 3.8L, variocam on intake and exhaust and some other juicy tidbits.

You think the 991 GT3 will have a DFI block or continue with the GT1?

#14

04-23-2010, 04:10 AM

03-turbo911

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Quote:

Originally Posted by kevin@parkplace

Thanks Khalid! I wonder what causes it - dry sump? or maybe flywheel?

You know, I heard all sorts of explanations but the one that made sense to me was that it has to do with engine oil coming up to pressure and actuating tensioners and/or valve lifters. Can't be flywheel because it happens on both the GT3 and the RS. Can't be the drysump because it doesn't happen to turbos.

Nice pics!

#15

04-23-2010, 08:44 AM

Haku

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This too may be completely gaga but here's my non tech input.

I've noticed this happens more often if I've washed the car and left it for a while. Start it up the next morning and for a split second BOOM and smoke. Could it possibly be anything to do with water accumulating somewhere?

Silly I know but I had to mention it...

#16

04-23-2010, 10:07 AM

STOPPIE

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Quote:

Originally Posted by Guest

You think the 991 GT3 will have a DFI block or continue with the GT1?

No idea David. We'll find out shortly, I'm sure.

Haku- I don't think that's the case mate.

#17

04-23-2010, 03:30 PM

kevin@parkplace

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Quote:

Originally Posted by 03-turbo911

thanks Khalid! I am going to track the car again next Sat will see if I can post a few more the following week.

I hadnt given it much thought based on your statement I am surprised Porsche hasnt put out a bulletin - the senior tech at Champion was unfamiliar with the condition...