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Unread 01-27-2013, 03:17 PM   #1
sarfu
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Carb/EGR question

I just purchased a rebuilt MC2100 carb for my 1974 304 V8, my old carb had a connection on the drivers side front above the mixture screw for the EGR hose, my new MC2100 does not have this connection, so how do I hook up my EGR?

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Unread 01-27-2013, 08:14 PM   #2
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bump
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Unread 01-27-2013, 09:17 PM   #3
86cj74.2L
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How's this?
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Unread 01-27-2013, 10:45 PM   #4
Matt1981CJ7
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Quote:
Originally Posted by 86cj74.2L View Post
How's this?
Kinda small for my ol' eyes....

Matt
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Unread 01-28-2013, 03:04 AM   #5
John Strenk
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Sure it was the EGR valve? not the PCV??
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Unread 01-28-2013, 06:12 AM   #6
Matt1981CJ7
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Any ported vacuum source will work for the EGR. The vacuum should be controlled by a CTO valve, so the EGR only operates when the engine is warm. Ported vacuum is usually found above the baseplate of the carb. There will be no vacuum at idle, but it will become present with increased RPMs.

The PCV valve needs a manifold vac source. Manifold vacuum can be pulled from intake runners, or from the base of the carb. If the nipple has vacuum at idle, it's a manifold vac source.

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Unread 01-28-2013, 02:43 PM   #7
dslywalker
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try this
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Unread 01-29-2013, 12:14 PM   #8
sarfu
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Thanks for the input guys, I can see where I could put a ported vacuum source for the EGR but that port is already being used for my temp. sending unit for the temp. gauge, could I "T" the egr into another ported vacuum source? And where are the other ported vacuum sources on the V8 engine?
I have a ported vacuum switch coming out of the thermostat housing, could I "T" the egr in there?

Thanks
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Unread 01-29-2013, 12:24 PM   #9
Matt1981CJ7
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Huh? Why is your temp sender hooked up to a vacuum source?

Go here, do some reading, then get with us.

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Unread 01-29-2013, 12:56 PM   #10
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Quote:
Originally Posted by Matt1981CJ7
Huh? Why is your temp sender hooked up to a vacuum source?

Go here, do some reading, then get with us.

Matt
Hopefully he means the choke housing.....
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Unread 01-30-2013, 04:23 AM   #11
John Strenk
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We all know he's talking about a V8 right??
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Unread 01-30-2013, 06:13 AM   #12
Matt1981CJ7
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Quote:
Originally Posted by John Strenk View Post
We all know he's talking about a V8 right??
Does it matter with respect to EGR plumbing?

And have you ever heard of a temp sender that is hooked to ported vac?

I think the OP may be in a little over his head, but I think we can save him.

Matt
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Unread 01-30-2013, 06:44 AM   #13
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Just to clarify my novice thinking, but doesn't the temp sending unit screw into the manifold where coolant cycles? Wouldn't hooking it up to vacuum suck it into the cylinder? Same thing in the thermostat housing which is blatantly just coolant?
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Unread 01-30-2013, 07:05 AM   #14
Matt1981CJ7
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Yes, Vinny, you are correct.

Matt
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Unread 01-30-2013, 09:18 AM   #15
John Strenk
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Quote:
Originally Posted by Matt1981CJ7 View Post
Does it matter with respect to EGR plumbing?

And have you ever heard of a temp sender that is hooked to ported vac?

I think the OP may be in a little over his head, but I think we can save him.

Matt

Just location of the parts.

Quote:
Originally Posted by vinnyabs View Post
Just to clarify my novice thinking, but doesn't the temp sending unit screw into the manifold where coolant cycles? Wouldn't hooking it up to vacuum suck it into the cylinder? Same thing in the thermostat housing which is blatantly just coolant?
The CTO works off of water temperature also and switches vacuum off and on depending upon temperature. So vacuum wouldn't reach the water.
There is like a wax plug that moves a piston up and down to cut off or open the ports on the CTO.
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