Engine Shroud Question

[pgeorgeson]

I am restoring a 1970 911T. The engine shroud is the correct black color for that year and model. However, although the duct on top was painted black, the black paint scrubbed off while cleaning and it is white. My question is this:
When it rolled off the assembly line, was the duct that is attached to the shroud black or white?

[proporsche]

i 2 of these virgin engines here...all shrouds just black ..plus the duck, which one are you talking about --picture??

Ivan

[pgeorgeson]

Tried to post a pic and got rejected. Trying again here

[proporsche]

oh ya this one is most of the time grey-white color..i though you were talking about the metal pieces..my bad..

Ivan

[E Sully]

I found this years back.

[pgeorgeson]

Thanks! That’s mine in the bottom left. 2.2T. With the white duct in all its glory.

[proporsche]

Originally Posted by E Sully

I found this years back.

nice...

[Series900]

The above chart is not correct. Tom B. created that with inventory he had and is right in color application, but not in actual pics. The discrepancy arises in the 2.2 , 2.4 to 2.7 area. The 70-72 years were definitely long grey riveted duct models. 73 has an early run of using inventory followed with the smooth integral duct version and the short bolted grey oil cooler duct. The improved 73 smooth duct is an easier to assemble and install part as the 70-72 requires riveting of the grey duct and steel baffle prior to engine install. The 73 only requires a steel baffle to be riveted. Thus easier to install on engine. The short grey cap also provided oil cooler servicing without removing induction and complete shroud. The 73 smooth integral duct worked with established MFI of Red S, green E and yellow T. It also worked with the new cis T in black. The first version of cis has steel welded tube runners. This changed for 74 cis as aluminum cast runners were implemented not requiring welding for assembly. This change in part thickness , specifically the #4 runner, caused interference in the smooth duct and required yet another shroud change, hence the kinked duct. The integral kinked duct version with short grey oil cooler cap of 74 carried thru to 88.
One might call me a bit of an expert here as we manufacture each and every shroud, compression molded and trimmed on cnc with both texture and color correct for the 5 shroud versions and 5 color variants of the evolution from 65-88 2.0-3.2 fiberglass parts.
The versions are..
65-68 black normal , red S 2 m6 bolts at fan ring, flat plate over oil cooler, 2 riveted vanes
69 black T carb, green E MFI , red S MFI 1 m6 bolt at fan ring and coil embossment for m8 stud. Flat plate over cooler , 2 riveted vanes
70-72 with long grey riveted duct and steel baffle separating #6 and oil cooler. Black carb T, yellow MFI T, green MFI E, red MFI S. 1 m6 and m8 stud at fan ring.
73 smooth integral duct/ short grey cap Black T , yellow T , green E, red S
74-88 Kinked integral duct/short grey cap 911/930 red S , green S and black depending on euro and year.
The more ya know!

[E Sully]

Thanks for the clarifications. While my late production '73.5 came with an original yellow shroud, I have also seen ones with original black.

[Series900]

I will also add, that unless you were the original owner, the shroud on your engine “could” have been changed. Parts are parts , and a damaged shroud or want of improved cooling or design, engines were always susceptible to change when the miles accumulated. MFI removed for “ tunable” carbs, better cooling or reassembly reasons, or I had this one and I like the color!

E sully…. A yellow 73.5 would be MFI. Are you cis or MFI? Original owner?

[pgeorgeson]

Thanks Series900. So it looks like mine (off a ‘70 T with carbs) is correct as shown. Right?

[Series900]

Yes pgeoreson. Your picture is correct

Take note that the MFI bump outs are NOT cut nor the three blanks for MFI pump mount along with no thru hole for MFI adjustment , and black. No black shroud was ever cut for MFI from the factory.

[E Sully]

Originally Posted by Series900

I will also add, that unless you were the original owner, the shroud on your engine “could” have been changed. Parts are parts , and a damaged shroud or want of improved cooling or design, engines were always susceptible to change when the miles accumulated. MFI removed for “ tunable” carbs, better cooling or reassembly reasons, or I had this one and I like the color!

E sully…. A yellow 73.5 would be MFI. Are you cis or MFI? Original owner?

Second owner, purchased in Sparta, NJ from original owner. It is an original yellow shroud, July '73 compliance sticker on door jamb. COA, matching numbers from Porsche.

[Series900]

CIS or MFI? That would be an anomaly if CIS.

[E Sully]

It's never easy to tell what's been done on an old car. Can you post a picture of an original '73.5 shroud with the air duct?
Mine is a CIS. I did a quick search and many '73 cis have black, I have found a few with yellow. Serial #s that were available 6135864, 6135818, 6139473(Sportmatic), 6135516