DFI Engine Block Info/Rumors

[J P Stein]

Internet rumor has it. ........

[Outlaw 911]

OK - I saw this one coming 3 years ago - when the 997S was introduced. It comes close to the GT3 power, in a much more modern package. Dry sump is great for racing setups - but FWIW - Porsche wanted to get away from the dry sump years ago for no other reason than - it eliminated a source of potential oil leaks. This has always been a source of expensive warranty repair for Porsche.

On the elimination of bearing housing...the 996 based engines until 2009 had an internal main bearing housing that was seperate from the cylinders, kinda like our old school 911 based engines - on the new engine the block contains both the bearings and the cylinders. Add a closed deck, so the cylinders are supported both on the top and bottom - the new design makes for a much stiffer block for the crank to ride in and also eliminates parts - both good things. The newer engines have a very fancy oil pump setup- which looks alot like a racing oil pump - they are setting up the new engine for boost (closed deck), hi-revs (shorter stroke, bigger bore), light weight (less parts) and a bright future.

I am excited to buy my 2009 997S with DSG in 2018, if someone would order one in silver with no sun roof or nav - that would be great - you have a buyer in 10 years.

Don't get me wrong - I love my 911, but holy hell - the basic engine architecture goes back to 1963. Even with 4 valves heads and water cooling.

Hmmmm....wonder if I could get a 997S and DSG Transaxel in my 80 911SC?

[304065]

I bet you guys there are parts in the new engine with 901 part numbers.

[Steve@Rennsport]

Originally Posted by blue72s

I have asked the parts dept to get me the length of the con rods as I’m interested to know what is the rod ratio of the new Carrera engines. However, the PET states that the long-stroke 3.6- and the short-stroke 3.8-litre engines share exactly the same con rods (same part number).

Anyway, the 9A1 block looks very good. I will try to post the sketches tomorrow or so.

The specs are already out; its an Alusil block using cracked-rod technology and DME controlled oiling systems (wet-sump)

Here you go,......


I'm guessing that this block is more expensive to replace than a set of Mahle P/C's,....

[blue72s]

Steve,

How did you get a 9A1 into your workshop already? The new cars are not even on sale in USA yet...

How do you know the block is made of Alusil and the con rods are cracked-rod technology? BTW do you have the length of the rods?

[930gt-40r]

Originally Posted by john_cramer

I bet you guys there are parts in the new engine with 901 part numbers.

That would be funny, but expected. Kinda like how the crank bearings Im buying for my 930 say "996......"

[Steve@Rennsport]

Originally Posted by blue72s

Steve,

How did you get a 9A1 into your workshop already? The new cars are not even on sale in USA yet...

How do you know the block is made of Alusil and the con rods are cracked-rod technology? BTW do you have the length of the rods?

LOL,..Sometimes its not what you know, its who you know,.... The pic is from the factory.

Porsche released full technical specifications on the 9A1 engines and thats where they stated engine bore lining material as well as rod design. No mention of rod lengths,....

[blue72s]

Originally Posted by Steve@Rennsport

Porsche released full technical specifications on the 9A1 engines and thats where they stated engine bore lining material

Is it just the bore lining or the whole block that is made of Alusil?

Where can I can get a copy of the full technical specifications? Is there a URL?

[Steve@Rennsport]

Originally Posted by blue72s

Is it just the bore lining or the whole block that is made of Alusil?

Where can I can get a copy of the full technical specifications? Is there a URL?

I don't know what alloy was used for the case castings, but the bores are Alusil. Thats a high-silicon material etched to make the silicon crystals stand proud. Pistons must be plated to run in such bores.

I bought the book from Porsche.

[Eagledriver]

That parts diagram looks alot like the old air cooled engine. This 8 bearing design should eliminate the RMS leak problems.

-Andy

[Steve@Rennsport]

Originally Posted by Eagledriver

That parts diagram looks alot like the old air cooled engine. This 8 bearing design should eliminate the RMS leak problems.

-Andy

LOL,.....The RMS problem was the LEAST of all the issues and the new design should fix it.

The M96 suffered intermediate shaft/bearing problems, cylinder casting problems, head casting problems (along with a host of other things).

The 9A1 eliminates the intermediate shaft entirely and runs the cams directly from the crankshaft. In addition, the cylinders are an integral part of the engine case using a closed-deck design. One of the most interesting feature of the 9A1 is a very complex engine breather system that should address the serious windage and case-pressurization issues that all of the older engines had.

Only time will tell if this is a more durable engine than the GT-1 based one, but it looks to be FAR superior to the M96,...

[850dunstall]

i figured somebody would be able to show the layout, now i have a dillemma, get the current boxster/cayman with the boat anchor engine or wait a bunch more till this block shows up on the street in the boxster/cayman....

any rumours as to the engine capacity the boxsters/cayman will get when they get this DFI engine?

[J P Stein]

Just my .02 of course.
Never buy a new model car the first year of production. Let the "gotta have it" crowd do the R & D for the manufacture. Porsche is no exception to that rule......their "new improved" water pumpers (986/996) make that obvious.

[safe]

Originally Posted by J P Stein

Never buy a new model car the first year of production.

Yeah, thats why I'm sticking with my high milage, oil leaking, tick'n and tock'n, mag case 2.7

The new engine looks very promising.

[J P Stein]

Originally Posted by safe

Yeah, thats why I'm sticking with my high milage, oil leaking, tick'n and tock'n, mag case 2.7

My 2.7 don't leak oil no more.
Gotta be a temporary condition.....It still makes all them clackety-clack noises tho.

Henry's advice for sealing the #8 bearing seems to have worked....the new bearing may have been part of the equation tho.

[1982911SCTarga]

What has technologically changed that makes DFI possible now vice earlier?

Brian

[304065]

Better electronics.

http://en.wikipedia.org/wiki/Gasoline_direct_injection

[1982911SCTarga]

Thanks, John.

Brian

[WERK I]

Don't forget the technology that allows the high pressure injector survive in such a very hostile environment. Combustion pressures and temperatures are quite a bit different than an injector sitting in an intake runner's cool environment.

[safe]

Yet, DFI (or GDI,GDi) has been used for over 10 years by Mitsubishi, VW etc.
And if you read the Wiki link, it was used during WWII.