Cold Air Intake

[007]

I was thinking of a Spectre air hat then a 4" coupler to their inline air filter then out of that to the fresh air source. In this case the cowl. I would use flexible tubing, so that I would be able to just pop it off and then clean or replace the filter then pop it back on again.


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[elwood blues]

The Spectre stuff is expensive.

 

[007]

The Spectre stuff is expensive.

Well that's true. I did like the look of the one earlier off the Cadillac, but I'd have to track one down.

I guess I could just use my stock air cleaner assembly and tube out of that to the cowl...at least as a stop gap installation.


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[elwood blues]

The Cadillac intake is my CJ. I bought it on eBay for like $50 shipped.

 

[007]

The Cadillac intake is my CJ. I bought it on eBay for like $50 shipped.

Gotcha. Well that's a savings of about $50 right there. Looks good.


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[Lumpy Grits]

The OEM setup works very well.
There are 'ports' on each side of the radiator.

Also-If you have to SMOG your Jeep-Make sure the modification is legal in your state.
LG

 

[007]

The OEM setup works very well.
There are 'ports' on each side of the radiator.

Also-If you have to SMOG your Jeep-Make sure the modification is legal in your state.
LG

I want cooler air than the OEM ports can deliver, there's a lot of radiator heat there at low speed that (while cooler than normal engine compartment air) isn't as cool as outside the compartment completely.

We don't have smog laws here, but in case I move somewhere that does, I'm keeping all the OEM stuff - heck my new intake I bought with the EGR provision.

 

[Lumpy Grits]

Are you using a shroud?
The coolest air is from the outside.
Your fan is pul'n air into the radiator. That OEM port is about as good as it gets. At speed the air has somewhat of a 'ram' effect into that port.
Put your hand in front of the grill at idle. You'll see what I'm say'n.

LG

 

[007]

I know exactly what you're saying... I used to use a piece of cardboard the fan would suck up against the grill to help it warm up faster.

I am using a shroud yes, but at low speed, most of the air that would go through those holes passes across (not through) the radiator and heats up. I'm not opposed to using it as a stop-gap, but my 77 does not have the venting to those holes. so I'd have to source the tubes and an air cleaner that will accept them - mine won't - it's fluted on the end / has a bell look.

 

[Lumpy Grits]

Do you have overheating issues with the setup you have now?
I found that by sealing any open air space around my radiator and then blocking off the unused air-port on the P/S of the grill. Forced far more air through the radiator.
I also have a 14" electric pusher fan to help with low speed on hot days.
Have you looked into any hood vents to let the hot air out of the engine bay?
I put a section of vent on the top of the hood about 4" from the back of the hood in the center between the hinges.
Mine is the second picture in post#1.
https://www.jeep-cj.com/forums/f7/louver-install-23533/
LG

 

[007]

I used to on highways in the mountains, where it was lugging. But now I've changed (and am still changing) so much, I can't say. I just want to eliminate engine compartment air and get it from the best place possible.

 

[Lumpy Grits]

Try the hood vent deal. Sure helped with heat build up.
Can you access the OEM air-duct ports near the radiator, on your jeep at all?
May well be worth the try........
LG

 

[mtnwhlr]

A cold air intake is drawing air from outside the engine compartment, the stock setup does just that. I think you guys are over thinking this. The pic I commented on does nothing. IMO

 

[007]

A cold air intake is drawing air from outside the engine compartment, the stock setup does just that. I think you guys are over thinking this. The pic I commented on does nothing. IMO

I won't argue that this is being over thought, particularly by me. But...there are better ways to get air than the stock setup is all I'm saying.

Stock is the easiest but peek in there and it's easy to see how that air gets heated. That said the one pic is just getting the hottest air available, which is what my stock setup does.


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[Lumpy Grits]

Your carb and intake manifold are heat soaked from the engine. The 'cold' outside air does little if anything.
The OEM air intake port works as good as anything else.
LG

 

[007]

Your carb and intake manifold are heat soaked from the engine. The 'cold' outside air does little if anything.

The OEM air intake port works as good as anything else.

LG

I usually agree with you Lumpy, but that's just not accurate, particularly in situations where under hood heat is disproportionately hot as compared to ambient conditions.

I've spent a lot of hours in the dyno room with pulling engines. The difference intake air temperature makes is striking both from a power as well as temperature perspectives.

Now how that translates to a naturally aspirated little AMC 304 will certainly be proportional but in an effort to keep things cool as well as healthy it's clearly of "some level" of benefit.


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[elwood blues]

Jeep came stock with a cold air intake. Both my '84 with a AMC 258 i6 / 4.2l and my '78 with a AMC 304 have it.

How is that a cold air intake when it is drawing hot air from the engine compartment?

A cold air intake is drawing air from outside the engine compartment, the stock setup does just that. I think you guys are over thinking this. The pic I commented on does nothing. IMO

mtnwhlr, you're not wrong, but at the same time I don't agree with you. And here's why;

-Yes, the factory intake on CJ's was a good set-up, no it was not a "cold air intake". It's not cold air because you're still getting air that is drawn through the grill/radiator. There's also the baffles and diverters in that factory intake that are meant to be heated and opened by the heat of the engine.

-The intake setup that I made is not a "cold air intake" either, because I'm not drawing "cold air" from outside of the engine bay, but you're wrong if you think it does nothing. I'm attempting to get air from the side of the engine that doesn't have the heat from the exhaust manifold and I'm attempting to scavenge the air coming out of the factory hole on the side of the grill.

-For those of us not running a factory carburetor, the factory air intake doesn't work, leaving us with Limited options on how to get air into our engines, the simplest option being a round filter plopped on top of the carb sucking up nothing but hot air from directly on top of the exhaust manifold;

Or, you start searching for other options, like I've done and like the other links and pictures I've posted others have done.

 

[Belizean]

That's me . Just a bunch of hot air

 

[Lumpy Grits]

Many of our engines have a OEM heated intake manifold. My AMC 258 i6 / 4.2l does. The carb is made from alum that heat soaks PDQ.
Air draw from the outside is a good thing!
Yes-That air draw changes with the atmosphere changes.
FWIW: My engine bay looks just like the first picture Elwood's post(#37). I can't change anything, and still be SMOG compliant here in PRK(Ca.).

Respectfully,
LG