soltino

Just picked up the Model Specific brochure for 997 and it states that there are "benifits" in this "internal" system.

Is this true with the possible exception of extreme racetrack applications?


tino

Geza

Reliability, for one. No external hoses or fittings to break, leak on hot exhaust manifolds and start engine fires. I find it quite interesting that a lot of people assume the integrated dry sump is not as good as the old external dry sump. As a mechanical design engineer, I'd give the Porsche engineers the benefit of the doubt until I sat down with one and had a lengthy conversation on the pros and cons of the integrated sump. Adapting an external dry sump to their race engines may be for purposes other than functional performace...maybe ease of maintanence...maybe increased oil volume...I don't know...but I wouldn't jump to conclusions.

BD997

whats that? which option??

Sloth

transduser

The integrated dry sump system is a wet sump to me.

TT Gasman

The new Ferrari 430 also features an "integrated sump" design in their engine, so maybe Porsche is on to something?

soltino

From the Brochure:


Dry-sump lubrication is race-proven technology that ensures a reliable supply of oil, while reducing engine operating temperatures.

A pump supplies oil from an internal resevoir located within the block to the lubrication points thoughout the engine. A futher pair of oil pumps--one in each bank of cylinders--then "scavenges" the oil and returns it to the resevoir.
This internal system offers a number of benefits compared with conventional external dry-sump tanks, including a reduction in both sysytem weight and oil volume.....

tino

Moogle

i thought the M97 engined 997 were wet sump

ltc

Yup, the only (true) dry sump engines are in the 996TT, GT2, GT3.....all from the same block/engine design.

BD997

inetersting...

ben in lj

yep, especially considering the misleading "integrated dry sump" on the 997 window sticker.

MKW

The problem with an integrated dry sump( still a wet sump ) assuming you can control oil pump starvation : the oil is still all stored right below the crank instead of in a separate reservoir , sloshing around and shifting with g forces so that the crank is sunjected to a lot of varying viscous friction.

Moogle

thats very misleading

Geza

I'm not sure whether you've examined the engine drawings, or torn down an engine to take a close look at the oil system (I know I didn't), but in the movie "Split Second" on the Porsche USA website under 911 movies, they show a detailed computer animation of the internals of the engine, including the oil system. From that movie, it looks to me that the internal oil reservoir is completely seperated from the crankshaft; there appears to be a V-shaped baffle plate that prevents oil from sloshing onto the crankshaft.

Gary R.

Yes, but did you notice that that they say "derived from racing" and that it assures lubrication even in "sporting driving style". Its that line between racing and sporty that they will get ya...