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914World.com _ 914World Garage _ Mystery intake/outlet in engine bay 74 2.0
Posted by: Marcel Aircooled May 21 2024, 12:09 PM
Does anyone know what should connect to this black steel pipe coming from the engine tin on the driver's side? 
It is not for the hoses from the charcoal canister. Those are both connected.
BTW my car is a 73 and the engine is a 74 2.0 GA engine
Thanks!
Posted by: GregAmy May 21 2024, 12:32 PM
Dunno what its original purpose was but it's bleeding engine air cooling, so I put a plug on mine.
Posted by: BillC May 21 2024, 01:00 PM
According to my copy of the '73 2.0 vacuum hose routing guide, that port provides pressurized (ish) air to the charcoal canister. The other hose from the canister gets connected to the top of the air filter housing.
I don't remember my previous '73 1.7L having that port; I'm pretty sure the pressure side connected somewhere else (don't remember exactly).
Posted by: Marcel Aircooled May 21 2024, 01:09 PM
According to my copy of the '73 2.0 vacuum hose routing guide, that port provides pressurized (ish) air to the charcoal canister. The other hose from the canister gets connected to the top of the air filter housing.
I don't remember my previous '73 1.7L having that port; I'm pretty sure the pressure side connected somewhere else (don't remember exactly).
I was told this before but, like I said in my first post, they are both connected.
One is connected to the right side of the cooler; see red line in below picture
The other one is connected to the air filter housing like you said
So I still have the small pipe on the left side unused..
Posted by: sportlicherFahrer May 21 2024, 01:25 PM
The port on the driver's side tin is correct for a '73 MY 2.0 car's charcoal canister. The port on the fan housing was for the later cars that had the canister mounted near the battery. I don't recall the exact changeover, but I think it was about '74. You have tin and a housing from different years, so just cap the one not being used.
Edit: Another look at your hose routing suggests that your car(or at least the plastic tubes across the front of the engine) are for a 1.7. The 1.7 cars used the port by the battery as well.
Posted by: scallyk9 May 21 2024, 01:33 PM
The port on the driver's side tin is correct for a '73 MY car's charcoal canister. The port on the fan housing was for the later cars that had the canister mounted near the battery. I don't recall the exact changeover, but I think it was about '74. You have tin and a housing from different years, so just cap the one not being used.
Correct. My 74 2.0L (built March 1974) has the charcoal cannister mounted with a strap to the back of the forward trunk wall and uses the port on the fan housing.
Posted by: Marcel Aircooled May 21 2024, 01:37 PM
The port on the driver's side tin is correct for a '73 MY 2.0 car's charcoal canister. The port on the fan housing was for the later cars that had the canister mounted near the battery. I don't recall the exact changeover, but I think it was about '74. You have tin and a housing from different years, so just cap the one not being used.
Edit: Another look at your hose routing suggests that your car(or at least the plastic tubes across the front of the engine) are for a 1.7. The 1.7 cars used the port by the battery as well.
The car is a 73 with the canister in the front trunk and engine is 74 2.0 so I suspect you are right that some parts not match and I should just plug the port not used. Thanks for the quick help!
Posted by: Marcel Aircooled May 21 2024, 02:24 PM
BTW any advise on what to use best to plug the port?
Posted by: sportlicherFahrer May 21 2024, 02:57 PM
A standard rubber or silicone vacuum port cap that fits should do fine. I think that port is close to 12mm or so.
Something https://www.amazon.nl/Intake-Vacu%C3%BCm-Siliconen-Stoppers-1618220380511/dp/B0CZF6M9P1/ref=sr_1_24_sspa?__mk_nl_NL=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=1TRRSA89VRJ0O&dib=eyJ2IjoiMSJ9.GWqnnH- hTFwQMOPQxpvNngN4cLMHowwY_L3OWRc6OlXrYdMVvgnIuMtWNOop1fRYNY1MMBuHx49v1113uzyeQV2
rjgDLRJaXDh1AJYtma45i4ywZ7uwbhA7fBb4BCGwLb_qjFKAvi5h0QwuLupOoHdrNsTCVdVbnVZTBNxe
ql8CuFE-_tugf00uroglzd2VA3c1uacHO91yQFE-oA7X-XzgxPUSgR_P1y7fJp-igY1O0i2Jf0NpHr6Ie_QB7eAljUM-DPQQ-_prwVZLQCdo2nbbpZZ7F4ou5nlCFeWFeEt8.AMCPapLjo27ycD_4Lou8SCddIWIDVbEQBtMqLSIda1Y&dib_tag=se&keywords=vacuum+cap&qid=1716324922&sprefix=vacuum+ca%2Caps%2C228&sr=8-24-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9tdGY&psc=1
Posted by: wonkipop May 21 2024, 07:05 PM
The port on the driver's side tin is correct for a '73 MY car's charcoal canister. The port on the fan housing was for the later cars that had the canister mounted near the battery. I don't recall the exact changeover, but I think it was about '74. You have tin and a housing from different years, so just cap the one not being used.
Correct. My 74 2.0L (built March 1974) has the charcoal cannister mounted with a strap to the back of the forward trunk wall and uses the port on the fan housing.
thats pretty interesting @http://www.914world.com/bbs2/index.php?showuser=20499
the changeover for the cans occurs during the start up of production of the 1.8s in nov 73.
the first half of 74 2.0 production from aug to oct 73 would have that tube bleed in the tin and the second half of 2.0 production from about feb 74 on must follow what the 1.8s and 1.7s always had with the fan casting bleed tube.
there looks to have been a lull in 74 2.0 production from nov 73 to sometime in feb 74 from all the L jet data we have. they mainly made the new L jets during those months.
not many if any 2.0s down the line.
Posted by: Marcel Aircooled May 21 2024, 11:16 PM
A standard rubber or silicone vacuum port cap that fits should do fine. I think that port is close to 12mm or so.
Something https://www.amazon.nl/Intake-Vacu%C3%BCm-Siliconen-Stoppers-1618220380511/dp/B0CZF6M9P1/ref=sr_1_24_sspa?__mk_nl_NL=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=1TRRSA89VRJ0O&dib=eyJ2IjoiMSJ9.GWqnnH- hTFwQMOPQxpvNngN4cLMHowwY_L3OWRc6OlXrYdMVvgnIuMtWNOop1fRYNY1MMBuHx49v1113uzyeQV2
rjgDLRJaXDh1AJYtma45i4ywZ7uwbhA7fBb4BCGwLb_qjFKAvi5h0QwuLupOoHdrNsTCVdVbnVZTBNxe
ql8CuFE-_tugf00uroglzd2VA3c1uacHO91yQFE-oA7X-XzgxPUSgR_P1y7fJp-igY1O0i2Jf0NpHr6Ie_QB7eAljUM-DPQQ-_prwVZLQCdo2nbbpZZ7F4ou5nlCFeWFeEt8.AMCPapLjo27ycD_4Lou8SCddIWIDVbEQBtMqLSIda1Y&dib_tag=se&keywords=vacuum+cap&qid=1716324922&sprefix=vacuum+ca%2Caps%2C228&sr=8-24-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9tdGY&psc=1
Perfect, thanks!
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