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Engine Compartment - Routing of wires & hoses, etc.

Bronco648

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People often hang a ground strap from frame that drags on the ground when stopped to prevent this
It's been a long time since I've seen one of those....
 


RonD

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More common on RVs or campers that store propane, and any tanker trucks that transport flammable liquids or gas

The paint jobs and under coatings now-a-days don't allow much static charge to build up in any bare metal unGround parts
The Rust factor and treatment almost eliminate it, lol
 

Bronco648

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Tire Size
14"
Thanks @AndyB. That's pretty much what I needed. I wasn't sure if it went up & over or under & around. Up & over it is.

Wow, you have a lot of original stuff in there; the plastic 'snorkel' from the radiator support, the exhaust manifold shroud & hose to the air cleaner (as well as power steering hoses). I have none of that stuff. I have an air cleaner but am not sure if it's worth using (it really needs to be bead blasted but I don't have that available to me).
 

Bronco648

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Engine Size
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Transmission
Automatic
2WD / 4WD
2WD
Tire Size
14"
Next Question: how do I connect the "L" shaped hard heater core tube to the lower t-stat housing? Is that just a short piece of heater hose?
 

Bronco648

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2WD
Tire Size
14"
I have seen different information, on the web, regarding the connection port on the carb for the vacuum advance hose (from the distributor).

Some don't even connect it and set the timing @ 12° BTDC.

What's the consensus?
 

RonD

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You need Vacuum advance or engine will stumble when accelerating or be very sluggish

Gasoline engines have two types of vacuum, regular/direct or ported
Direct vacuum is in the intake, between intake valves and throttle plate, carb or EFI, high vacuum when throttle is closed
Ported vacuum is between air filter and throttle plate, high vacuum when throttle is open

On a Carb direct vacuum is below thottle plate and Ported Vacuum is above throttle plate

You always use direct/regular vacuum for Vacuum advance on a distributor

When emission requirements got stricter most car makers used Ported Vacuum to cause exhaust leaving a cylinder to still be burning, this is before catalytic converters, when car makers were using Air Injection to lower emissions
This caused all sorts of exhaust valve issues, lol
And some used thermal switches to use ported when engine was cold and then changed to direct after warm up, or visa versa


The point of Vacuum advance, or LOAD Advance which is what it is, is because air/fuel mixes burn at different rates
Leaner mixes burn slower(however leaner mixes can self ignite easier, which is something different)
Richer mixes burn faster

Distributor(or spark module) can do RPM advance on its own, with weights and springs(or timing chips), and thats pretty simple, and this is what "Base spark timing" is being used for, RPM Advance

The point of spark timing is to ignite the air/fuel mix Before TDC, so you get full explosive power After TDC, 5deg to 10deg ATDC, so piston/head chamber is still small and piston/rod has leverage to push down in its crank journal
The base gasoline 14.7:1 air/fuel ratio has a known burn rate
But as you richen the mix burn rate speeds up, and its not "fixed rate" the richer it is the faster it burns, until it floods out the spark, then no ignition, lol

So when you "step on the gas" you change to a richer mix which burns much faster, this means you need to change the RPM advance spark timing, reduce it

Say RPM advance is set at 10deg BTDC, base spark timing
When you hook up Vacuum advance it should go up to about 20deg BTDC, because direct Vacuum is high at idle, so the higher vacuum is holding spark advance higher
If you slowly raise RPMs, spark timing will slowly go up, RPM Advance only
If you "step on the gas" vacuum drops and spark timing will as well because the Richer Mix will burn/fully ignite faster so needs spark to happen later, closer to TDC, to get full ignition at the 5-10deg ATDC
 
Last edited:

Bronco648

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Automatic
2WD / 4WD
2WD
Tire Size
14"
On a Carb direct vacuum is below throttle plate and Ported Vacuum is above throttle plate

You always use direct/regular vacuum for Vacuum advance on a distributor
OK, I will connect the vacuum advance to the carb. The second part of the question is; which barbed connection to use?

I've seen the vacuum line connected to the barbed port on the passenger side of the carb, just forward of the choke. Is that the correct port on the carb? Or, should the connection be on the 'tree' on the back of the EGR spacer?

TIA!!
 

RonD

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Was just looking at Duraspark distributor and it seems they want Ported Vacuum, which is odd but try it, any open vacuum port on carb is OK as long as its above throttle plate
 

Bronco648

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Location
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Engine Size
2.8
Transmission
Automatic
2WD / 4WD
2WD
Tire Size
14"
Was just looking at Duraspark distributor and it seems they want Ported Vacuum, which is odd but try it, any open vacuum port on carb is OK as long as its above throttle plate
I started with early Mustangs, back in the 80s. I seem to recall that those distributors were connected to the back of the carb (4100?), above the PCV valve port. It was easy to identify because it was not a barbed connection and the tube, sticking out of the carb body, was brass. My 2150 carb has one of those ports. I will give it a try.
 

RonD

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PCV Valve uses regular vacuum, like Power brake booster
 

Bronco648

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Automatic
2WD / 4WD
2WD
Tire Size
14"
PCV Valve uses regular vacuum, like Power brake booster
Right, which is why that port isn't affected by the throttle plates, correct?
 

RonD

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Regular vacuum goes down when throttle is opened
Ported vacuum goes up when throttle is opened
So both are effected by throttle plate's position
 

Bronco648

Active Member
Joined
May 23, 2019
Messages
352
Reaction score
81
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Location
Chicago-land, Illinois
Vehicle Year
1985
Make / Model
S
Engine Type
2.8 V6
Engine Size
2.8
Transmission
Automatic
2WD / 4WD
2WD
Tire Size
14"
Regular vacuum goes down when throttle is opened
Ported vacuum goes up when throttle is opened
So both are effected by throttle plate's position
Now I'm confused.

I've identified six ports on the 2150 carb:

  1. Below the accelerator pump on the front of the carb, very close to the driver's side fuel adjustment screw
  2. Just forward of the choke mechanism on the passenger side of the carb
  3. Large port on the back of the carb (PCV)
  4. Smaller port on the back of the carb (brass tube) about mid-way up
  5. On the top of the carb, forward of the venturis (I'm pretty sure this is the fuel bowl vent)
  6. On the 'air horn' (?)

carb ports.png
 

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