1978 Cobra Vacuum Ported Switch Question

Vic1978

Active Member
Dec 11, 2017
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#1
Help needed. I’ve done research on vacuum port switches. My understanding is, they get to a certain temperature (unk temp), they open and vacuum is introduced to whatever they are hooked up to.

I see 3 different type switches on this stock intake. One 3 port and two 2 port. The 2 ports are next to each other but physically are shaped different at the top. I
711FC13D-A5F0-4332-8ED7-D8272A18A2BF.jpeg
DE5616F4-909A-41AF-9746-715D0D151C89.jpeg
s there a difference in all three switches? Do they all get heat from the water source through the intake water ports as opposed to exhaust ports?

I’m not a mechanic and I’m trying to figure this out.

In advance, thanks for the help.
 
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jozsefsz

5 Year Member
Aug 11, 2013
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Cleveland OH Area
#2
Been a long time since mine has had the switches, but as I recall they're all water-heated. Exhaust heat would melt the snot out of them, that I've only ever seen used for heating the choke (via a thin tube) or I'd guess you could run an EGR from it (or AIR injection into it) if you didn't have other provisions.
 

Vic1978

Active Member
Dec 11, 2017
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#3
Thanks for your reply, makes sense. I’m trying to put all of the smog stuff back and I’m trying to connect all it’s necessities as they should go but not sure where they all go. I’ll keep researching.

Thanks again.
 

COBRA 7

Founding Member
May 19, 2000
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Bangor, Maine
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#4
Port 1 and 2 are temp units heated from the coolant running through the intake.

Port 3 is a vacuum port in the intake runner. Has vacuum all the time. For vacuum booster for brakes. Also for vacuum modulator on automatic transmission.
 

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