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Open-plane intake on 6.2

Q

quinryan

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I have one of these. Unlike the OEM manifold, it only has one port for EGR plumbing. As much as I am totally dedicated to keeping the EPA happy, I wonder if anybody has an opinion on the open-plane (army style?) intake. I expect that drilling a second EGR port into the open plane manifold is doable. Question is, is it worth the trouble?

Thanks
 
I don't think you are talking about an EGR port, as military (J-code) 6.2's do not have an EGR. I'm guessing you are talking about the crankcase breather or CDR.
 
You're probably right. Just to make sure, behind the alternator is a puck-shaped item roughly 4" round and 2" deep. A hose extends to it from the oil filler. Underneath that is a rubber doohikee (too technical?) with 2 pipes. There are 2 tubes extending from the doohikee, one going to the left of the manifold and the other to the right. Crankcase breather? Actually makes more sense.

In the center of the OEM manifold there is another metal doohikee with a vacuum port. I assume that it's part of the CDR. Truck runs pretty bad with it out.

If it is a breather (seems like it should be), I imagine that there's more than a few ways to re-plumb it with something from Summit or Mr. Gasket, etc.

Bottom line though, is the OEM manifold good enough to leave things be, or is the flat-plane intake worth the extra trouble?

Thanks.
 
quinryan said:
You're probably right. Just to make sure, behind the alternator is a puck-shaped item roughly 4" round and 2" deep. A hose extends to it from the oil filler. Underneath that is a rubber doohikee (too technical?) with 2 pipes. There are 2 tubes extending from the doohikee, one going to the left of the manifold and the other to the right. Crankcase breather? Actually makes more sense.

In the center of the OEM manifold there is another metal doohikee with a vacuum port. I assume that it's part of the CDR. Truck runs pretty bad with it out.

If it is a breather (seems like it should be), I imagine that there's more than a few ways to re-plumb it with something from Summit or Mr. Gasket, etc.

Bottom line though, is the OEM manifold good enough to leave things be, or is the flat-plane intake worth the extra trouble?

Thanks.
Click to expand...

The single plane intake is worth a few poneys and worth the trouble, and it does have 2 ports for the breather tube, it just doesn't have the EGR.
If your states does a visual inspection you will not be able to pass, if they only do a sniffer test then you should be fine.
 
Appreciate the input. I'm in Colorado which sniffs in a few counties (mine being one of them) but does not do visual.

Per the ports, the only port that I can see is on the passenger-side of the riser. Unlike the OEM-intake, it does not have a port on the driver's side.

I've read where some guys have run a tube straight from the oil filler (before the "tuna can") and runs straight to the passenger-side port. Good idea?

I'm new with this, so accept my apology for all the questions.

Thanks
 
quinryan said:
Appreciate the input. I'm in Colorado which sniffs in a few counties (mine being one of them) but does not do visual.

Per the ports, the only port that I can see is on the passenger-side of the riser. Unlike the OEM-intake, it does not have a port on the driver's side.

I've read where some guys have run a tube straight from the oil filler (before the "tuna can") and runs straight to the passenger-side port. Good idea?

I'm new with this, so accept my apology for all the questions.

Thanks
Click to expand...


OK, before I say anymore I will go tomorrow morning and compare both engines, and maybe take a few pic for you.
I have one such engine sitting on a frame where I am going to be working tomorrow. ANd I still have my old EGR intake so I can compare and report.:dunno:
I do know a lot of people do the conversion, but never thought about what they had to do.
 
imiceman44 said:
you cannot see pics here because you are not a peying member.
I will email them to you
Click to expand...


Awseome, thank you. I've been working on this basket-case Jimmy of mine for some time now. Used to smoke like it was coal-fired, but I dialed back the IP and guesstimated the timing and I think that I'm about 90-95% there.

The vacuum solenoid on the D/S of the block has nothing connected to it at all. There are two ports. Where do they go?

Thanks again
 
speaking of that doohiickee can i get a picture of it? my 6.2 is mission it and i gotta figure out what i need to fix it sorry to thread jack but i figured its along the same topic
 
The port/valve with the vacumm line to it located in the center of the intake manifold (that you can see once the air cleaner is removed) is the EGR and completely seperate from the CDR (crankcase breather).

Later model J-codes, like the one I installed, only have one CDR port on the passenger side which is the same as the old C-code did.
 
My '83 'C' code intake has the dual CDR lines, one to each side of the intake. My '85 J code also has the dual CDR lines, again one to each side. I do understand the military J code intakes out there only have one CDR inlet though.

I would think you should be able to remove the second inlet from the old C code and install it on the new J code without too much issue. Not sure if it's pressed in, but that would be my guess.

Rene
 
Why not just convert it to a single CDR/single line setup? My '89's C-code intake only had one line and CDR and the late J-code I put on had the same setup.
 
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