snake eyes

True dry sumps are the 997 Gt3 all model years 997.1 turbo, 997 GT2 and 997 GT2 RS
That is it period.

All corvettes c7s are dry sump except for base models without z51. C6 grand sport, c6 z06, and c6 Zr1 are also dry sump.

Hope this answers all questions..
Also only the GT variants of the 9a1 motors had dry sumps just FYI

rbennett

Great vid of Porsche bench testing oil starvation on a 2009 911 motor.

go.illini

Interesting. We have Leon993 revive this thread back in 2011 after 6 years in slumber. And now chicabum performing another resuscitation after another 5 years.

I think it is well established that the 997.1 M97 engine that this thread was asking about way back in 2005 (11 years ago) is not dry sump.

Batman33

I was very let-down when I learned that that the sump in my 2007 C2S that the Porsche marketing literature called an "integrated" dry sump was not actually a dry sump. Here I thought I'd never have to worry about starvation. Typical corporate BS I assume.

KNS

Some of the money they saved on its "integrated dry sump" engines went to the marketing department.

alexb76

So, 997.2 TT is NOT dry sump either, right?

go.illini

FTFY

Johnny6spdDriver

The turbo and all the GT series are true dry sump.

Kineticdg

My understanding of the 9A1 engine is that it has a new concept for the oiling system that eliminates oil starvation while cornering, i.e. it delivers the full benefit of dry sump but in an innovative way. The system can reduce power to the oil pump while just chugging along to improve fuel economy, but them ramp up additional oil flow immediately when driven hard. Is that correct?

Wayne Smith

More important regarding oil starvation is the number and location of scavenger pumps to insure that an internal chamber that houses the main oil pump is always supplied with oil regardless of G forces acting on the motor.

The proportional control valve does vary pressure based upon motor needs and does add a fraction to the mpg value, but this is not a solution to starvation.

A true dry dump resides external to the motor. The 9A1 chamber is internal to the motor. It acts like a dry sump but what you call it is dependent upon semantics.

bheit1

All Porsche 996 and 997 cars have an integrated dry sump engine (yes, it's an actual dry sump) with two exceptions, which have a dry sump w/ external oil tank:

GT2 RS (M97.70S engine), and, GT3 RS 4.0 liter (M97.74 engine)

Source: Porsche 997 The Essential Companion

Ericson38

The Turbo V-6 in our 2019 Panamera works that way. Proportional output based on load, not just RPM.

Quadcammer

yea, no, its not an actual dry sump. The oil pickup, which goes to the oil pump, sits in the sump, where the oil also resides. The primary oil pump does no scavenging. Its a wet sump, plain as day. Saying that the two scavenge pumps on the cams make it an integrated dry sump or whatever is just a bunch of marketing ****. And if you want to call it a dry sump, its a terrible one as oil starvation is an obvious and well known problem.

rileyracing1

The 997 gen is sort of a dry sump "integrated" but not in the true sense of the word when compared to GT cars for example .... I would call it sort of a dry sump ...

bheit1

Some oil is retained in the "pan" of both engines. The only major difference of the two systems is one is integrated in the engine and one isn't. The GT cars, built as race cars, contain more oil in their external tanks. The non GT cars do have an oil starvation problem, but that's a design issue. That's how Adrian Streather explained it in his book. He's considered a Porsche authority. I had to chuckle at his comment to pay no attention to the cult of dry sump deniers.