 Intake Plenum |
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| Gordong |
 Dec 22 2022, 09:21 AM
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#1
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Newbie  Group: Members Posts: 30 Joined: 20-January 22 From: Carson City Nevada Member No.: 26,268 Region Association: None 
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Hey Guys,
I have a 75 914 2.0 D-Jetronics Injection. Can anyone tell me what the two holes that run through the bottom of the Plenum are for? Seems to me this would be a vacuum leak?   |
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| JeffBowlsby |
Dec 22 2022, 09:39 AM
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#2
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914 Wiring Harnesses Group: Members Posts: 8,505 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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They are hollow internal support tubes (look inside the plenum). They don't all leak, but when they do its often at the interface with the outer shell of the air plenum. They can be soldered or sealed if they leak.
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| brant |
Dec 22 2022, 09:41 AM
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#3
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Look at the interior
I believe the holes are a pipe that is run all the way through and is sealed so as to not create a leak |
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| 914werke |
Dec 22 2022, 10:38 AM
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#4
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"I got blisters on me fingers" Group: Members Posts: 10,059 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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Its a chamber on which significant vacuum is applied (when appropriately sealed) . Without some stiffening/support it would collapse / cave in.
The tubes provide that stiffening & to protect from the inevitable top pressure of installing the air cleaner. As Jeff mentioned they crack around the brazed points Attached thumbnail(s)  
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| Gordong |
Dec 22 2022, 02:55 PM
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#5
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Newbie Group: Members Posts: 30 Joined: 20-January 22 From: Carson City Nevada Member No.: 26,268 Region Association: None
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Thank you guys very much.
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