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Join Date: Mar 2006
Location: Elk Grove, CA
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Close call...could have been bad news

I was getting on it a bit giving a fellow in a Supra (No, it wasn't a heavily modded one!) a look at my rear plate, and while watching the rear view mirror, I saw smoke and the fellow behind me waved me down.

He told me didn't look like it was coming from the exhaust (which was a relief)...so I took it easy on the way home to take a look.

It wasn't hard to see....I had apparently had scraped the bottom of the turbo drip tank and it had fractured the weld just below the flange creating a gap of about 2/32nds a quarter way around one side of the down tube. When I'd get on it and the oil was pumping thru there, it would blow back onto the hot turbo and smoke like a destroyer escort. I was fortunate to have one of Brian's (Rarlyl8) stainless drip tanks on hand, so the swap out was quick....now I know where my oil was going.

I was dogone lucky the down tube didn't break off completely and dump my oil out...but it's something to think about when going over speed bumps or those deep curbs out of those mini malls.

I never felt it scrape anything or heard any noise...and there were no marks on the muffler or any of the undercarriage....but your drip tank does hang down a bit, so remember that if your're out and about that you can be a bit vulnerable right at that spot. I measured it and it's 6 5/8 inches to the bottom of the drip tank....dunno??
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1987 factory Slantnosed 930 Cabriolet/Guard's red
2002 Midnight Blue 996TT X50
1999 Iris Blue 996 (Dash fire burned and totalled 9/07)
Old 03-16-2009, 06:37 PM
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Good thing you caught it!

There is always a chance that road debris is the culprit instead of you having scraped something...at least I had a rock hit the underside of my car once when driving and it was unbelieveably loud.
Old 03-16-2009, 06:57 PM
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I have heard of some shortening the aftermarket tanks, so they dont hang as low. I had the same issue (w/ aftermarket tank) when I let my father take the 930 out one day. There was a trail of oil all the way home...
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 03-16-2009, 08:17 PM
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Is there a reason that the 90 degree elbow on the drip tanks extend so far down? What would possibly be the downside to shortening the downtube so that the drip tank sat further up under the car and thus out of the way of any potential strikes from rocks or road debris?

If I had the downtube shortened and rewelded to the flange, does anyone with an engineering background see that this might cause a problem? Brian??
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1987 factory Slantnosed 930 Cabriolet/Guard's red
2002 Midnight Blue 996TT X50
1999 Iris Blue 996 (Dash fire burned and totalled 9/07)

Last edited by Chuck Jones; 03-17-2009 at 01:41 AM..
Old 03-16-2009, 09:10 PM
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People have done this in the past. As long as you position it correctly to your application, there should not be a problem. I am thinking it was so long in order to work on many different turbo applications
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 03-17-2009, 08:40 AM
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