Help ID this canister and where the hose should go!

[roadsterswap]

This is an 85 3.2 engine in a 77 911. It is one I just bought off of this website. It is black with steel wide body conversion. I am very thankful for this website and some of the folks I talked to about it before purchase.
I am working from the back of the car to the front, trying to get familiar with this car and to fix things that I notice are incorrect or need TLC. This car is full smog legal and has been to a referee for smog and is certified. It has passed smog with flying colors.
I noticed this canister and suspect it is part of the smog system. It has a large vacuum line in the rear and there was this end that is open? It was just resting on the valve cover and did not seem right. I moved it up off the valve cover and secured it with a zip tie. There is no mounting location in the engine bay for this canister in this area of the car.

The photo shows the large canister and the opening. To the right there is another small plastic valve that has a small vacuum line going to it in the rear. I noticed there is a location for another hose and it looks like it matches the canister.

I know, buy a Bentley book, which I will do soon. I just thought I would ask you experts for advice and suggestions as to what and where this belongs and if i need a hose to it. And does the hose go to the little other black valve.

Thanks for the help. The car runs great. Everything is in working order. I plan on making it a spoiler delete car. I have a speedster non skirted front valence in black and I have already rounded up some wheels and will be removing the late model wheels on the car now.
I am looking for a front under valence skid or bash bar that was on the later cars, if you know of any. Thanks again.

[Bob Kontak]

On the oil filler side of the engine, there are no metal straps behind the oil filler on the inner fender wall?

That is where it belongs.

[roadsterswap]

I thought I looked carefully, but I may have missed it. The large hose may be obscuring vision of the mounting location. The canister has the strap on it. It looks like it could be released and then mounted somewhere and the canister reinstalled. How about the open and and does it go to that little valve you can just barely see in the photo to the right?

[Bob Kontak]

I don't think the little valve has anything to do with it.

Does the canister have a big and small port on the other side?

Pretty simple system.

I can get you pics of my 81.

[LM3929]

That is your Charcoal canister and the little valve is an ambient air Valve


Lorne M.

[roadsterswap]

The back of the canister has a matching pipe as in the photo and a rubber hose connects to it and heads toward the intake manifold area ( I think, its kind of hard to see). The photos would be a great help. Thanks.

[Bob Kontak]

So you are saying the front and back of the canister have a single port. One end has a port and the other end has a port? If so, are you absolutely sure of this?

[roadsterswap]

I will double check. I do know the rear has a port and the hose is on it. I do not recall feeling another hose. Just one right in the center like the one in the photo. I would go check but the car is across town and I cant get to it until after Thanksgiving. I will take more photos when I get back. I will pull it out and take better photos. Thanks for the help

[quattrorunner]

My 77 911 has that same canister mounted to a strap just behind the oil filler. It's on the side wall kinda out of the way. I want your wheels since your getting rid of them. Pm me?

[roadsterswap]

Pm sent. On the canister is the one port open or are they both plumbed into something?

[Bob Kontak]

This is based on my 81. On the back side there are two ports. On the front (rear bumper side) there is one.

The small port on the back side takes gas vapors from the expansion tank in the driver's front fender. There is a little hose that runs from front to back through the tunnel - metal tubes and hoses. The bigger port (still on backside) is connected to the driver's side of the airbox. On earlier cars (don't know exactly when) the front outlet connects to the fan shroud - I think. On later SC's like mine the front port is left open.

Determine if one side of the canister has two ports - one 3/8's or so and the other maybe 1/8.

[roadsterswap]

I went and looked. The canister has two ports on the back. One is a small line and it snakes forward somewhere, I forgot to follow it out. The other port is a large one like the one shown in the photo and it goes to the airbox area I believe. Sorry I was not looking where they were going. I will do that again. The front one is just open. The canister has a clamp on it and it looks like it can be mounted somewhere to secure the canister. I just zip tied it in a secure spot. When I got the car it was just dangling on the valve cover.

[Bob Kontak]

Yes, the larger hose goes to the airbox area. But you do not have an airbox, right? You have a 3.2 engine. On the 3.2 cars the carbon canister is in the passenger side wheel well.

You need to find where the larger hose from the back side hooks into a 3.2 and I do not know the answer to that.

You have a different style clasping mechanism than my 81. I have the straps welded (I think they are welded) to the inner fender behind - closer to the front of the car - the oil filter. Look closely and you may find mounting screws.

Leave the front port open to the atmosphere.

[HarryD]

It is part of the system to keep gasoline fumes from escaping the car. Here is how Porsche did it for some of the cars:

Originally Posted by Grady Clay

The evaporative emissions system is actually very useful
and worthwhile to keep in working condition. First and
very important, your 911 doesn’t constantly smell of
gasoline. If you are missing the charcoal canister, it
is common to many German cars of the era. Just tape
over the VW logo.

Here is the diagram for ’69-‘73: “

"
© Dr. Ing. h.c. F. Porsche A.G.


1) Expansion chamber [the black box under the cowl
on the driver’s side]
2) Vent chamber [behind the LF headlight]
3) Activated charcoal container
4) Engine fan shroud
5) Pressure line from fan to activated charcoal container
6) Purging line from charcoal container to engine air cleaner

Note the 13 connections around #1 and the fuel tank. This
clear (now brown) hose typically shrinks and comes off the
fittings causing gas fumes in the trunk and cockpit


Here are the locations in the 911.
“
"
© Dr. Ing. h.c. F. Porsche A.G.


With CIS the system was simplified somewhat.
“
"
© Dr. Ing. h.c. F. Porsche A.G.

1) Fuel tank
2) Expansion chamber [LF fender]
3) Activated charcoal filter [a reservoir for the fuel vapors]
4) Cooling fan shroud with hose connector [source of air]
5) Hose from cooling fan to activated charcoal filter [supplies
air to the charcoal]
6) Hose from activated charcoal filter to air filter [carries
the fuel vapors to the engine to be burned]
7) Engine air filter
8) Return hose connecting the fuel tank to the expansion
chamber [this clear (now brown) hose typically shrinks
and comes off the fittings causing gas fumes in the trunk
and cockpit]

This diagram shows CIS but the system is the simular for
MFI and carburetors from ’69 as above. The two tubes
in the tunnel are #5 and #6.


It is worth having all this stuff because some day you (or a
future caretaker) just might be required to have it functional.

Best,
Grady

[roadsterswap]

Here is the engine shot. Thanks for the diagrams I am trying to understand them. Anyone in monterey reading this?

[roadsterswap]

oh just for the record here is an update photo of the car. I will go and track things down this weekend.

[HarryD]

If i am not mistaken, in the 3.2 cars, the line that goes from the engine cooling shroud to the carbon canister was deleted and the canister just pulls fresh air from the surrounding air.

Part #2 should be found in your front wheel well. In early cars, it was a white/translucent plastic tank. In later cars is was black plastic.

[roadsterswap]

If that is so, then everything is hooked up ok. I just have to find the correct mounting location for the canister. I wish I had a photo.

[Bob Kontak]

HarryD - I think they deleted the front hose to the shroud with the end of the 2.7 model and excess inventory rolled into the earlier SC's. I do not have the shroud port on my 81,
PDF file page 114 does not even show the front hose for the 78-83 SC/Turbo.

http://www.porsche.com/all/media/pdf/originalparts/usa/911_USA_78_83_KATALOG.PDF

Page 113 in the 74-77 catalog show the hose and a mounting bolt but not the location of where the canister mounts.

I will try to find you a picture.

http://www.porsche.com/all/media/pdf/originalparts/usa/911_USA_74_77_KATALOG.pdf

[Bob Kontak]

Here is a 1977 canister mounted.

http://forums.pelicanparts.com/porsche-911-technical-forum/612050-experts-what-would-you-do-engine-8.html