Mystery Hose '72 2L

1602 Views 16 Replies 5 Participants Last post by quadrifolio, Oct 26, 2020

bulletpruf

Discussion Starter · Oct 17, 2020

So I've got this small hose hooked to my cam cover ventilation; it's next to the larger tube that used to go to the air cleaner. Where is the small hose supposed to connect?

thanks

Scott

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alfaparticle

· #2 · Oct 17, 2020

It goes to the vapor recovery system in the trunk, if you still have one

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alfettaparts2

· #3 · Oct 17, 2020 (Edited)

The small pipe coming of the breather fitting that comes out at a 90 degree angle where to go down to the front of the inlet manifold.

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bulletpruf

Discussion Starter · #4 · Oct 17, 2020

Thanks, I appreciate the info and picture.

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I don't have a diagram to show you but if your car is US spec it connects to a tube that runs through the firewall, along the floor and in to the trunk. It sends gasoline vapors from the fuel tank back into the engine in order to save the planet.

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alfettaparts2

· #6 · Oct 18, 2020 (Edited)

There are four variations of the breather fitting that bolts to the cam cover.

1: It has the main breather hose and no small extra hose.

2:It has the main breather hose with one small hose at 90 degrees to the inlet manifold. That goes under to the front of the inlet manifold as in the diagram I provided.

3: It has the main breather hose with a small hose that runs parallel to the intake manifold the goes to the canister at the rear as part of a fuel vapor recovery.

4:Main breather hose with two small hoses. One at 90 degrees going to the front of the manifold, the second running parallel to the intake manifold going to the rear fuel canister.

The fitting the OP has was intended to go to the front of the inlet manifold as shown in the diagram I provided.
On early cars with the remote air cleaner the 90 degree small hose can also run straight back to the air box.

Alfaparticle if you are talking about a SPICA car I simply wouldn't know but would like to see a diagram so I can understand.

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bulletpruf

Discussion Starter · #7 · Oct 18, 2020

Ok, so Alfettaparts - I can't find any spot on the manifold to plug in the hose. I'm going to use a mirror and a light to look around just to be sure.

Ed - it's a 72 GT Junior that I bought in Naples, Italy a few years ago. It has a 72 or so 2L in it now that was also sourced in Naples.

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alfettaparts2

· #8 · Oct 18, 2020

So it probably has the wrong breather fitting. It should have no 1 where there are no extra small hoses.
If its any help I'm about to head into work. I can take some photos of the different fittings.

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bulletpruf

Discussion Starter · #9 · Oct 19, 2020

Thanks, that would be appreciated.

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alfettaparts2

· #10 · Oct 19, 2020

First two pictures are of inlet manifolds. One with the fitting, one without. The rest are variations of the breather that bolts to the cam cover. I think its pretty straight forward which ones match each other. I have no idea which car is supposed to have which ones with regard to originality. I'm lucky if I can remember my own phone number so I'll leave that sort of detail to someone else.

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Aggie57

· #11 · Oct 19, 2020

This may help:

Question re: crankcase breather hose

I have a '66 1600 GTV that I am sorting out wrong parts that the prior owner put on from a 1750 (Last picture! and yes, the seats are 1750 seats! but I am keeping them). I am replacing the intake manifold seen in picture #1 with a screw in manifold with 40mm/32mm port size (carb side/engine...

www.alfabb.com

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bulletpruf

Discussion Starter · #12 · Oct 19, 2020

Thanks, fellas. It looks like I can go ahead and plug the small fitting (or swap out to an assembly without the extra fitting), since there doesn't appear to be a corresponding fitting on the intake manifold.

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Aggie57

· #13 · Oct 20, 2020

You may want to consider a catch tank for the open breather.

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bulletpruf

Discussion Starter · #14 · Oct 20, 2020

I have one of the Alfaholics catch cans that I need to install. Want to do their pedal box first so I can see where I have room. Until then, I have a road draft tube that exits on the bottom of the engine compartment.

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bulletpruf

Discussion Starter · #15 · Oct 25, 2020

I verified that I don't have the fitting on the intake so I put a rubber cap on the other fitting. You can also see the temporary air draft tube I'm running.

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alfettaparts2

· #16 · Oct 25, 2020

Perfect

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quadrifolio

· #17 · Oct 26, 2020

take out the plug in the intake manifold with a flat screwdriver and plug it with a M7x100 screw and your done! it acts as an air leak in cyl. 1, so i plug it all times

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