Air hose from exhaust to intake?

[Chapap]

The tube that directs warm air off the exhaust manifold into the carb has nothing to do with emissions. It is purely there to prevent carb icing.

Don’t ask me for for the answer, but Wikipedia says: “…for the purpose of increasing the consistency of mixing of the air and fuel in order to reduce engine emissionsand fuel usage.”

Heated air inlet - Wikipedia

en.m.wikipedia.org

 

[19Walt93]

Don’t ask me for for the answer, but Wikipedia says: “…for the purpose of increasing the consistency of mixing of the air and fuel in order to reduce engine emissionsand fuel usage.”

Heated air inlet - Wikipedia

en.m.wikipedia.org

You know wikipedia can be edited by anyone, right? Cars had hot air snorkels primarily for improved running and faster warm up in cold weather, a warm engine is more efficient and therefore would run cleaner but that was a welcome side effect, not the main purpose. The cold air would cause the gas to liquify instead of staying vaporized. I only drive my Mustang and Ranger in the warm months( mid April to very early November in NH) and neither has a preheater tube, you definitely don't need one in Florida.

 

[Chapap]

You know wikipedia can be edited by anyone, right?

 

[cbxer55]

Any vehicle I ever had that had one of those hot air tubes, I removed it first thing. Never had an issue, even in the winter. I don't want no hot air in my intake. While all three of my current vehicles do have aftermarket cai's on them, they all also have methods of routing cold air to the filter. Lightning and Mustang have tubes running from the front to the area where the filter resides. Ranger has two small scoops on the hood directly over the filter, and also a three inch tube from inside the lower "grill" opening. Man is it a good running 3.0. I get asked frequently what size V-8 it has.

 

[Curious Hound]

Don’t ask me for for the answer, but Wikipedia says: “…for the purpose of increasing the consistency of mixing of the air and fuel in order to reduce engine emissionsand fuel usage.”

Heated air inlet - Wikipedia

en.m.wikipedia.org

Probably mostly good info. But take it with a grain of salt. Wikipedia articles are written by people like us. This particular one contains this disclaimer.

 

[RonD]

If you live in an area with emissions testing then the pre-heater must be visibly present like Cats, PCV or EGR, they don't test it just visually look for it to be intact like the other emissions systems

Air pre-heaters were/are used on aircraft to prevent icing and on cars as well for years and years, but it became an emissions system once there were emissions restrictions/regulations in place, because a warm engine has less emissions, simple as that, and an air pre-heater allows engine to warm up faster so less emissions over-all

On a working air pre-heater system your engine NEVER gets warm air from the system once coolant is above 140degF
So the stock Ranger CAI still does its job of providing cold air after warm up

 

[dirtymike]

Here is my CAI valve door. Its been taped off for years. Don't know where it is suppose to be ducted to.

 

[dirtymike]

Should i water proof it or run it higher?

 

[RonD]

Here is my CAI valve door. Its been taped off for years. Don't know where it is suppose to be ducted to.

Should be a 2 part, thin metal, "shield", bolted to front end of closest exhaust manifold, it would have the same size round tube connection as in you picture

Parts 11 and 12 in this diagram: https://dz310nzuyimx0.cloudfront.ne...aa4f7a84/f0853f92af9e96d475ae554de29ce759.png

Center of 5 is whats in your picture
10 would the flexible tube that connects center 5 to 11/12

 

[Chapap]

On a working air pre-heater system your engine NEVER gets warm air from the system once coolant is above 140degF

Mine doesn’t seem to have any computer control and isn’t taking coolant temp into account. Maybe they got smarter later, but mine looks to be controlled strictly by that bimetallic strip.

 

[Dirtman]

You know wikipedia can be edited by anyone, right?

I often edit Wikipedia pages to add that dinosaurs invented lightbulbs...

 

[RonD]

Yes, its not computer controlled, just average temp of engine coolant when pre-heated air will no longer be needed
As engine bay heats up the air cleaner box, the bi-metal valve will close
On colder days it takes longer, on warmer days it may never open the valve to get pre-heated air

 

[RonD]

I often edit Wikipedia pages to add that dinosaurs invented lightbulbs...

Russia invented the light bulb, along with most other things, haven't you ever watched Star Trek
Or are you doubting Pavel Andreievich Chekov?

 

[dirtymike]

Thanks RonD. my part 2 has been gone a long time. Got the valve covered up. It still works. I uncovered it and watched it close slowly as the temp rose. My ranger dont like start ups , it stumbles until you feather the gas a little. Thought warmer air on start up might be easier on it.?

 

[RonD]

Yes, remove that tape over the valve inlet, just prevents air flow when it opens
Hard start could be just lack of air flow until valve closes and you get full flow from CAI

ECT sensor can also cause hard starts when engine is cold
All gasoline engines need to be Choked when cold
ECT sensor tells computer how cold engine is so computer can decide how much Choke to use

If ECT is telling computer engine is 100degF when its really 60deg then not enough Choke until it warms up to 100degF, so hard start until it warms up a bit