svp928

That is an injection-molded plastic part- I can't believe they would spend the big money on a mold and then not produce it.... but, plastic does not seem like it would survive long in the pan, the windage forces are very powerful. I have seen 1/8" thick stainless parts eventually break from fatigue in drysump pans, so the plastic may have not made it through durability testing.
Still it shows that the factory knew there were problem there...? Very interesting part!

depami

That depends on hull design. Ever been in a low profile inboard ski boat? My Flightcraft 18XLT is a good example.

Vilhuer

944 uses plastic piece in late MY pan. Also 968 IIRR.

Hilton

Whats interesting is it appears to my laymans eyes that this baffle was designed for a broader solution than the GTS baffle which has the superceding part number.

By broader solution, I mean actually attempting to condense the windage by separating/scraping it from the rotating crank, unlike the GTS one which just aims to keep more oil around the pickup and prevent the oil wave moving back along the pan due to acceleration.

Given the complexity difference, I have to wonder whether the later design was created as a cheaper solution, rather than as a more effective one?

Also - looking at it, I find myself wondering whether it may even work in addition to the GTS baffle? Looks like a fair bit of clearance under it, and as though there wouldn't be interference around the pickup.

Pic of the GTS baffle in my '89's sump attached to see what I mean.

Interesting that this implies Porsche must have been working on a crank scraper for the 928 sometime before the 1992 introduction of the GTS.

Hilton

Just noticed - this baffle mounts to the six tap-able bosses on the rails that run longitudinally down the pan. Evidently they were thinking about the need for it when they made the pan casting?

Kevin Johnson

They thought the problem was caused by slow draining from the heads. This carried through in how they tried to address the issues in the 996/997. Foamed oil does drain slowly.

S4ordie

John, you must boat on very flat water, meaning, no waves. A beam wave (from the side) rocks a boat tremendously causing all liquiids on the boat to slosh mightily (fuel, oil, water, head waste, libation).

ew928

Wonder what happens to the oil in the pan when the boat is at speed (high revs) and it slams repeatedly on the waves. I've never bothered to be holding onto any libations and just enjoy bouncing on the waves.

GlenL

If they got as far as making a mold and didn't produce it then it may have failed in testing. That'd be a few bucks each to make after something like $20K to design and make the first one.

I was hoping that Kevin J. would give a technical opinion.

That "GTS" baffle is near worthless. Since it doesn't seal across the back it doesn't hold the oil in the pan. It does shield half of the surface from blowing air but that's not the problem. (IMO) It is very cheap to design, make and install. Had to be a factor in going with the "07" approach instead of "06."

jcorenman

Which is why boat engines have deep sumps, when possible. And since they are not usually limited for vertical space, that is usually possible.

This is an interesting development of the 928 motor, from the Porsche Museum thread. Note the very deep sump. That engine would have serious problems fitting between a 928 hoodline and the pavement...

It is, however, very interesting that the mounting bosses are in the pan, apparently from the earliest pans?

Leon Speed

Just heard from the seller; he says the pan has a "80" casting number on it. Doesn't have to mean the baffle is from the same year though.

Seems the baffle doesn't completely line up with the bosses, the lower left bolt goes through the pan.

Vilhuer

Bosses are probably in all pans just due to casting reasons and they were just used for mounting this version. GTS baffle uses same mounting points as first screen version of oil pick up did.

90 S-4

Aryan,
Were you able to ask the guy that bought it what his plans for it are, is he
going to make a coffee table decoration out of it or is he going to test it &
develop it ? Would he be willing to send it to the US so some of the experts
over here could see it and evaluate it. This piece is the rarest 928 archeological
find to come along in ages, it may be a totally usesless part or it might be the
answer to one of biggest acillies our motors have. I just hope he doesn't stuff
it away like the factory has been doing to us all these years, I hope he shares
the knowledge, good or bad..

IcemanG17

Much better pics of this baffle......but I wonder what it was designed to accomplish.....since the primary weakness of the 928 oil pan is the fact that it is wide and shallow....which increases the problems with the pickup getting uncovered in high G turns....and this baffle doesn't seem to control the deep part of the sump very much?

Here is a pic of an early pan with screen and plastic sump insert.....this is the setup I installed in the lemons racer...& it appears to have solved the problem....zero bearing wear-oil starvation in 6 hours on track....

GlenL

Primary? I fault the slight slope of the pan as being worse. Or is it the closeness of the pan to the crank? In an case, the pan design is bad and wasn't fixed. Hard to lower the sump or pan. Could have raised the engine and flattened the intake, but they didn't.

I'd like to see the back of the Porsche windage piece. What'd be cool is to have vanes that direct the swirling air forwards and along the floor of the pan.