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Author Topic: Another idenitfy this thingy  (Read 1982 times)

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Offline DaemonForce

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Another idenitfy this thingy
« on: May 04, 2013, 07:43:53 PM »
Vacuum ball removed for this purpose.

What is the set of inlets that go underneath the vacuum ball and what are they for?



I notice they seem to be some kind of ported vacuum with a delay when there's a drop in pressure. It's between the driver side fender and the frame so it's not like I can just get to it and see for myself. Any ideas?
1983 Limited
AMC 258C {R2:11.Oct.12}
Carter 2681 {R2:28.Oct.12}
TorqueFlite A998 {R6: -20.Apr.12}
NP129 {R2:28.Apr.12}
M35-273 {???}
Compression: 10.5:1
Corrected Idle: 500RPM

Offline BenM

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Re: Another idenitfy this thingy
« Reply #1 on: May 04, 2013, 08:12:38 PM »
I think that's the mysterious 4wd vacuum canister they hid in the fender.
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1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline DaemonForce

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Re: Another idenitfy this thingy
« Reply #2 on: May 04, 2013, 10:00:16 PM »
I do believe you may be on to something. It definitely has the properties of a vacuum cannister as you see in the picture I can just port my manifold vacuum to it without a cap and the engine runs perfectly fine. So lets see...I have a stealth 4WD vacuum, vacuum ball, vacuum cannister on the passenger side right above the cruise motor...How much reserve vacuum is the Eagle supposed to have and why do I need so many?! O_o
1983 Limited
AMC 258C {R2:11.Oct.12}
Carter 2681 {R2:28.Oct.12}
TorqueFlite A998 {R6: -20.Apr.12}
NP129 {R2:28.Apr.12}
M35-273 {???}
Compression: 10.5:1
Corrected Idle: 500RPM

Offline BenM

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Re: Another idenitfy this thingy
« Reply #3 on: May 05, 2013, 06:21:19 PM »
They wanted you to have plenty, I guess.

Chrysler hid one in the front bumper of the Cherokee. I know of at least one that was broken off its mount causing all sorts of problems for the engine and hvac.

They eliminated that one in later years and it shared with other items. You should see if it holds vacuum, or at the least cap off it's supply so you don't have a vacuum leak.
NSS#47184

1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline DaemonForce

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Re: Another idenitfy this thingy
« Reply #4 on: May 05, 2013, 08:04:31 PM »
This is very interesting because I use manifold vacuum on my 4WD reserve cannister and I just use the one right above that plumbing because it's convenient. They all work perfectly fine. I just thought it was a little weird that right under a vacuum ball is a stealth vacuum cannister. Apparently Chrysler wasn't the only company that went nuts with these things.
1983 Limited
AMC 258C {R2:11.Oct.12}
Carter 2681 {R2:28.Oct.12}
TorqueFlite A998 {R6: -20.Apr.12}
NP129 {R2:28.Apr.12}
M35-273 {???}
Compression: 10.5:1
Corrected Idle: 500RPM

Offline BenM

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Re: Another idenitfy this thingy
« Reply #5 on: May 06, 2013, 09:28:24 AM »
You ought to see a car with door locks and a trunk release powered by vacuum in addition to all the heater motors and emissions equipment.

I think the extra tank was added with stop-and-shift due to all the extra lines and second motor.
NSS#47184

1987 AMC Eagle Sedan -- 1976 Pacer Coupe -- 1968 Pontiac Tempest Custom S -- 1940 Mercury (& a 2002 Jetta Turbodiesel, 5 spd., the Wife's Daily Driver)

Offline carnuck

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Re: Another idenitfy this thingy
« Reply #6 on: May 06, 2013, 02:15:37 PM »
They wanted you to have plenty, I guess.

Chrysler hid one in the front bumper of the Cherokee. I know of at least one that was broken off its mount causing all sorts of problems for the engine and hvac.

They eliminated that one in later years and it shared with other items. You should see if it holds vacuum, or at the least cap off it's supply so you don't have a vacuum leak.

Actually, AMC stuck them in the right front corner of the bumper on XJs (Chrysler didn't take over till after the end of '87 model year and broke their contract by killing the Eagle line in '88 and selling the Eagle name after a lawsuit forced them too IIRC)

Even my '84-'86 XJs had the vacuum foot ball in the bumper and even the slightest love tap seemed to crush them and cause running issues. I moved mine under the hood and my Eagle wagon even has one under the battery box on the frame!
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Offline captspillane

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Re: Another idenitfy this thingy
« Reply #7 on: May 10, 2013, 02:41:27 PM »
The other side of that hole has two tubes that run up to a canister.

You need to plug one side if you have the other side still connected, otherwise it is just one big vacuum leak.
Currently Inspected and Insured as of Jan 2013:
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Offline DaemonForce

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Re: Another idenitfy this thingy
« Reply #8 on: May 10, 2013, 06:43:05 PM »
Wherever that goes, it doesn't appear to be an issue even with the main manifold vacuum line hooked into it without a cap but it's not a problem anyway. That picture isn't an accurate representation as to how my Eagle's vacuum is setup. The thing I posted in the other thread gives you a better idea what it looks like because I don't have any delay valves, CTO, feedback systems or thermal switches. All of that is going to be scrapped in a few months anyway. I need to build a new 258 motor and at least I'll be dropping the entire vacuum diagram for more modern devices.
1983 Limited
AMC 258C {R2:11.Oct.12}
Carter 2681 {R2:28.Oct.12}
TorqueFlite A998 {R6: -20.Apr.12}
NP129 {R2:28.Apr.12}
M35-273 {???}
Compression: 10.5:1
Corrected Idle: 500RPM